submission 419555
moshe_05859 · python · License unknown
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cudeepy_nvfp4_group_gemm.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-nvfp4-group-gemm-419555?include=source"interfacepython
Compatibility
measured onNVIDIA B200
declared hardwareNVIDIA B200
architecturessm_100
dtypesfp8_e4m3, nvfp4
Benchmark evidence
1 measurement across 1 GPU, fastest first.
Operation / workload
Hardware
Latency
Rank
Observed
Reported · How evidence levels are derived →
Source and license
sourceavailable
revision digestsha256:935366cbe1d5b6588adc5a6075f3b672f6c9dee2309f3a6ca8a36584c3a53c64
license declaredunknown
license concludedunknown
authorsmoshe_05859
imported2026-08-15
Techniques
Extracted from the mirrored source by pattern, never inferred. Each row cites its line.
fused-epilogue
self.epi_tile = sm100_utils.compute_epilogue_tile_shape(mbarrier
self.epilog_sync_barrier = pipeline.NamedBarrier(persistent-kernel
tile_sched_params: utils.PersistentTileSchedulerParams,shared-memory
self.smem_capacity = utils.get_smem_capacity_in_bytes("sm_100")tcgen05
tcgen05.CtaGroup.TWO if self.use_2cta_instrs else tcgen05.CtaGroup.ONEwarp-specialization
ab_pipeline_producer_group = pipeline.CooperativeGroup(pipeline.Agent.Thread)Kernel source
cudeepy_nvfp4_group_gemm.py2760 lines
import argparse
import functools
from typing import List, Type, Tuple, Union
from inspect import isclass
import torch
import cuda.bindings.driver as cuda
import cutlass
import cutlass.cute as cute
from cutlass.cute.nvgpu import cpasync, tcgen05
import cutlass.torch as cutlass_torch
import cutlass.utils as utils
import cutlass.pipeline as pipeline
from cutlass.pipeline import pipeline_init_arrive, pipeline_init_wait
import cutlass.utils.blackwell_helpers as sm100_utils
import cutlass.utils.blockscaled_layout as blockscaled_utils
from cutlass.cute.runtime import from_dlpack
from cutlass.cutlass_dsl import Boolean, extract_mlir_values, new_from_mlir_values
class GroupedWorkTileInfo:
def __init__(self, tile_idx: cute.Coord, is_valid_tile: Boolean, group_search_result):
self._tile_idx = tile_idx
self._is_valid_tile = Boolean(is_valid_tile)
self.group_search_result = group_search_result
def __extract_mlir_values__(self) -> list:
values = extract_mlir_values(self.tile_idx)
values.extend(extract_mlir_values(self.is_valid_tile))
values.extend(extract_mlir_values(self.group_search_result))
return values
def __new_from_mlir_values__(self, values: list) -> "GroupedWorkTileInfo":
if len(values) != 11:
raise ValueError("Length of mlir values extracted is incorrect.")
new_tile_idx = new_from_mlir_values(self._tile_idx, values[:3])
new_is_valid_tile = new_from_mlir_values(self._is_valid_tile, [values[3]])
new_group_search_result = new_from_mlir_values(
self.group_search_result, values[4:11]
)
return GroupedWorkTileInfo(
new_tile_idx, new_is_valid_tile, new_group_search_result
)
@property
def is_valid_tile(self) -> Boolean:
return self._is_valid_tile
@property
def tile_idx(self) -> cute.Coord:
return self._tile_idx
"""SM100 Grouped Blockscaled GEMM Kernel - NVF4 format."""
class Sm100GroupedBlockScaledGemmKernel:
def __init__(self, sf_vec_size: int, mma_tiler_mn: Tuple[int, int], cluster_shape_mn: Tuple[int, int], occupancy: int = 1):
self.acc_dtype = cutlass.Float32
self.sf_vec_size = sf_vec_size
self.use_2cta_instrs = mma_tiler_mn[0] == 256
self.cluster_shape_mn = cluster_shape_mn
# K dimension is deferred in _setup_attributes
self.mma_tiler = (*mma_tiler_mn, 1)
self.cta_group = (
tcgen05.CtaGroup.TWO if self.use_2cta_instrs else tcgen05.CtaGroup.ONE
)
self.tensormap_update_mode = utils.TensorMapUpdateMode.SMEM
self.occupancy = occupancy
# Set specialized warp ids
self.epilog_warp_id = (
0,
1,
2,
3,
)
self.mma_warp_id = 4
self.tma_warp_id = 5
self.threads_per_cta = 32 * len(
(self.mma_warp_id, self.tma_warp_id, *self.epilog_warp_id)
)
# Set barrier for epilogue sync and tmem ptr sync
self.epilog_sync_barrier = pipeline.NamedBarrier(
barrier_id=1,
num_threads=32 * len(self.epilog_warp_id),
)
self.tmem_alloc_barrier = pipeline.NamedBarrier(
barrier_id=2,
num_threads=32 * len((self.mma_warp_id, *self.epilog_warp_id)),
)
# Barrier used by MMA/TMA warps to signal A/B tensormap initialization completion
self.tensormap_ab_init_barrier = pipeline.NamedBarrier(
barrier_id=3,
num_threads=64,
)
self.smem_capacity = utils.get_smem_capacity_in_bytes("sm_100")
# Hardcoded value: get_max_tmem_alloc_cols("sm_100") returns 512
self.num_tmem_alloc_cols = 512
def _setup_attributes(self):
# Compute mma instruction shapes
# (MMA_Tile_Shape_M, MMA_Tile_Shape_N, MMA_Inst_Shape_K)
self.mma_inst_shape_mn = (
self.mma_tiler[0],
self.mma_tiler[1],
)
# (CTA_Tile_Shape_M, Round_Up(MMA_Tile_Shape_N, 128), MMA_Inst_Shape_K)
self.mma_inst_shape_mn_sfb = (
self.mma_inst_shape_mn[0] // (2 if self.use_2cta_instrs else 1),
cute.round_up(self.mma_inst_shape_mn[1], 128),
)
tiled_mma = sm100_utils.make_blockscaled_trivial_tiled_mma(
self.a_dtype,
self.a_major_mode,
self.b_major_mode,
self.sf_dtype,
self.sf_vec_size,
self.cta_group,
self.mma_inst_shape_mn,
)
tiled_mma_sfb = sm100_utils.make_blockscaled_trivial_tiled_mma(
self.a_dtype,
self.a_major_mode,
self.b_major_mode,
self.sf_dtype,
self.sf_vec_size,
cute.nvgpu.tcgen05.CtaGroup.ONE,
self.mma_inst_shape_mn_sfb,
)
# Compute mma/cluster/tile shapes
mma_inst_shape_k = cute.size(tiled_mma.shape_mnk, mode=[2])
mma_inst_tile_k = 4
self.mma_tiler = (
self.mma_inst_shape_mn[0],
self.mma_inst_shape_mn[1],
mma_inst_shape_k * mma_inst_tile_k,
)
self.mma_tiler_sfb = (
self.mma_inst_shape_mn_sfb[0],
self.mma_inst_shape_mn_sfb[1],
mma_inst_shape_k * mma_inst_tile_k,
)
self.cta_tile_shape_mnk = (
self.mma_tiler[0] // cute.size(tiled_mma.thr_id.shape),
self.mma_tiler[1],
self.mma_tiler[2],
)
self.cluster_tile_shape_mnk = tuple(
x * y for x, y in zip(self.cta_tile_shape_mnk, (*self.cluster_shape_mn, 1))
)
# Compute cluster layout
self.cluster_layout_vmnk = cute.tiled_divide(
cute.make_layout((*self.cluster_shape_mn, 1)),
(tiled_mma.thr_id.shape,),
)
self.cluster_layout_sfb_vmnk = cute.tiled_divide(
cute.make_layout((*self.cluster_shape_mn, 1)),
(tiled_mma_sfb.thr_id.shape,),
)
# Compute number of multicast CTAs for A/B
self.num_mcast_ctas_a = cute.size(self.cluster_layout_vmnk.shape[2])
self.num_mcast_ctas_b = cute.size(self.cluster_layout_vmnk.shape[1])
self.num_mcast_ctas_sfb = cute.size(self.cluster_layout_sfb_vmnk.shape[1])
self.is_a_mcast = self.num_mcast_ctas_a > 1
self.is_b_mcast = self.num_mcast_ctas_b > 1
self.is_sfb_mcast = self.num_mcast_ctas_sfb > 1
# Compute epilogue subtile
self.epi_tile = sm100_utils.compute_epilogue_tile_shape(
self.cta_tile_shape_mnk,
self.use_2cta_instrs,
self.c_layout,
self.c_dtype,
)
# Setup A/B/C stage count in shared memory and ACC stage count in tensor memory
self.num_acc_stage, self.num_ab_stage, self.num_c_stage = self._compute_stages(
tiled_mma,
self.mma_tiler,
self.a_dtype,
self.b_dtype,
self.epi_tile,
self.c_dtype,
self.c_layout,
self.sf_dtype,
self.sf_vec_size,
self.smem_capacity,
self.occupancy,
)
# Compute A/B/SFA/SFB/C shared memory layout
self.a_smem_layout_staged = sm100_utils.make_smem_layout_a(
tiled_mma,
self.mma_tiler,
self.a_dtype,
self.num_ab_stage,
)
self.b_smem_layout_staged = sm100_utils.make_smem_layout_b(
tiled_mma,
self.mma_tiler,
self.b_dtype,
self.num_ab_stage,
)
self.sfa_smem_layout_staged = blockscaled_utils.make_smem_layout_sfa(
tiled_mma,
self.mma_tiler,
self.sf_vec_size,
self.num_ab_stage,
)
self.sfb_smem_layout_staged = blockscaled_utils.make_smem_layout_sfb(
tiled_mma,
self.mma_tiler,
self.sf_vec_size,
self.num_ab_stage,
)
self.c_smem_layout_staged = sm100_utils.make_smem_layout_epi(
self.c_dtype,
self.c_layout,
self.epi_tile,
self.num_c_stage,
)
mbar_smem_bytes = self._get_mbar_smem_bytes(
num_acc_stage=self.num_acc_stage,
num_ab_stage=self.num_ab_stage,
num_c_stage=self.num_c_stage,
)
# Use utils.TensorMapUpdateMode.SMEM by default
tensormap_smem_bytes = (
Sm100GroupedBlockScaledGemmKernel.bytes_per_tensormap
* Sm100GroupedBlockScaledGemmKernel.num_tensormaps
)
if (
mbar_smem_bytes
+ tensormap_smem_bytes
+ Sm100GroupedBlockScaledGemmKernel.tensor_memory_management_bytes
> self.reserved_smem_bytes
):
raise ValueError(
f"smem consumption for mbar and tensormap {mbar_smem_bytes + tensormap_smem_bytes} exceeds the "
f"reserved smem bytes {self.reserved_smem_bytes}"
)
@cute.jit
def __call__(
self,
initial_a: cute.Tensor,
initial_b: cute.Tensor,
initial_c: cute.Tensor,
initial_sfa: cute.Tensor,
initial_sfb: cute.Tensor,
group_count: cutlass.Constexpr[int],
problem_shape_mnkl: cute.Tensor,
strides_abc: cute.Tensor,
tensor_address_abc: cute.Tensor,
tensor_address_sfasfb: cute.Tensor,
total_num_clusters: cutlass.Constexpr[int],
tensormap_cute_tensor: cute.Tensor,
max_active_clusters: cutlass.Constexpr[int],
):
self.a_dtype = initial_a.element_type
self.b_dtype = initial_b.element_type
self.sf_dtype = initial_sfa.element_type
self.c_dtype = initial_c.element_type
self.is_nvfp4_output = self.c_dtype is cutlass.Float4E2M1FN
self.a_major_mode = utils.LayoutEnum.from_tensor(initial_a).mma_major_mode()
self.b_major_mode = utils.LayoutEnum.from_tensor(initial_b).mma_major_mode()
self.c_layout = utils.LayoutEnum.from_tensor(initial_c)
if cutlass.const_expr(self.a_dtype != self.b_dtype):
raise TypeError(f"Type mismatch: {self.a_dtype} != {self.b_dtype}")
# Setup attributes that dependent on gemm inputs
self._setup_attributes()
# Setup sfa/sfb tensor by filling A/B tensor to scale factor atom layout
# ((Atom_M, Rest_M),(Atom_K, Rest_K),RestL)
sfa_layout = blockscaled_utils.tile_atom_to_shape_SF(
initial_a.shape, self.sf_vec_size
)
initial_sfa = cute.make_tensor(initial_sfa.iterator, sfa_layout)
# ((Atom_N, Rest_N),(Atom_K, Rest_K),RestL)
sfb_layout = blockscaled_utils.tile_atom_to_shape_SF(
initial_b.shape, self.sf_vec_size
)
initial_sfb = cute.make_tensor(initial_sfb.iterator, sfb_layout)
tiled_mma = sm100_utils.make_blockscaled_trivial_tiled_mma(
self.a_dtype,
self.a_major_mode,
self.b_major_mode,
self.sf_dtype,
self.sf_vec_size,
self.cta_group,
self.mma_inst_shape_mn,
)
tiled_mma_sfb = sm100_utils.make_blockscaled_trivial_tiled_mma(
self.a_dtype,
self.a_major_mode,
self.b_major_mode,
self.sf_dtype,
self.sf_vec_size,
cute.nvgpu.tcgen05.CtaGroup.ONE,
self.mma_inst_shape_mn_sfb,
)
atom_thr_size = cute.size(tiled_mma.thr_id.shape)
# Setup TMA load for A
a_op = sm100_utils.cluster_shape_to_tma_atom_A(
self.cluster_shape_mn, tiled_mma.thr_id
)
a_smem_layout = cute.slice_(self.a_smem_layout_staged, (None, None, None, 0))
tma_atom_a, tma_tensor_a = cute.nvgpu.make_tiled_tma_atom_A(
a_op,
initial_a,
a_smem_layout,
self.mma_tiler,
tiled_mma,
self.cluster_layout_vmnk.shape,
)
# Setup TMA load for B
b_op = sm100_utils.cluster_shape_to_tma_atom_B(
self.cluster_shape_mn, tiled_mma.thr_id
)
b_smem_layout = cute.slice_(self.b_smem_layout_staged, (None, None, None, 0))
tma_atom_b, tma_tensor_b = cute.nvgpu.make_tiled_tma_atom_B(
b_op,
initial_b,
b_smem_layout,
self.mma_tiler,
tiled_mma,
self.cluster_layout_vmnk.shape,
)
# Setup TMA load for SFA
sfa_op = sm100_utils.cluster_shape_to_tma_atom_A(
self.cluster_shape_mn, tiled_mma.thr_id
)
sfa_smem_layout = cute.slice_(
self.sfa_smem_layout_staged, (None, None, None, 0)
)
tma_atom_sfa, tma_tensor_sfa = cute.nvgpu.make_tiled_tma_atom_A(
sfa_op,
initial_sfa,
sfa_smem_layout,
self.mma_tiler,
tiled_mma,
self.cluster_layout_vmnk.shape,
internal_type=cutlass.Int16,
)
# Setup TMA load for SFB
sfb_op = sm100_utils.cluster_shape_to_tma_atom_SFB(
self.cluster_shape_mn, tiled_mma.thr_id
)
sfb_smem_layout = cute.slice_(
self.sfb_smem_layout_staged, (None, None, None, 0)
)
tma_atom_sfb, tma_tensor_sfb = cute.nvgpu.make_tiled_tma_atom_B(
sfb_op,
initial_sfb,
sfb_smem_layout,
self.mma_tiler_sfb,
tiled_mma_sfb,
self.cluster_layout_sfb_vmnk.shape,
internal_type=cutlass.Int16,
)
a_copy_size = cute.size_in_bytes(self.a_dtype, a_smem_layout)
b_copy_size = cute.size_in_bytes(self.b_dtype, b_smem_layout)
sfa_copy_size = cute.size_in_bytes(self.sf_dtype, sfa_smem_layout)
sfb_copy_size = cute.size_in_bytes(self.sf_dtype, sfb_smem_layout)
self.num_tma_load_bytes = (
a_copy_size + b_copy_size + sfa_copy_size + sfb_copy_size
) * atom_thr_size
# Setup TMA store for C
epi_smem_layout = cute.slice_(self.c_smem_layout_staged, (None, None, 0))
tma_atom_c, tma_tensor_c = cpasync.make_tiled_tma_atom(
cpasync.CopyBulkTensorTileS2GOp(),
initial_c,
epi_smem_layout,
self.epi_tile,
)
# Compute grid size
self.tile_sched_params, grid = self._compute_grid(
total_num_clusters, self.cluster_shape_mn, max_active_clusters
)
self.buffer_align_bytes = 1024
self.size_tensormap_in_i64 = (
Sm100GroupedBlockScaledGemmKernel.num_tensormaps
* Sm100GroupedBlockScaledGemmKernel.bytes_per_tensormap
// 8
)
# Define shared storage for kernel
@cute.struct
class SharedStorage:
tensormap_buffer: cute.struct.MemRange[
cutlass.Int64, self.size_tensormap_in_i64
]
ab_full_mbar_ptr: cute.struct.MemRange[cutlass.Int64, self.num_ab_stage]
ab_empty_mbar_ptr: cute.struct.MemRange[cutlass.Int64, self.num_ab_stage]
acc_full_mbar_ptr: cute.struct.MemRange[cutlass.Int64, self.num_acc_stage]
acc_empty_mbar_ptr: cute.struct.MemRange[cutlass.Int64, self.num_acc_stage]
tmem_dealloc_mbar_ptr: cutlass.Int64
tmem_holding_buf: cutlass.Int32
# (EPI_TILE_M, EPI_TILE_N, STAGE)
sC: cute.struct.Align[
cute.struct.MemRange[
self.c_dtype,
cute.cosize(self.c_smem_layout_staged.outer),
],
self.buffer_align_bytes,
]
# (MMA, MMA_M, MMA_K, STAGE)
sA: cute.struct.Align[
cute.struct.MemRange[
self.a_dtype, cute.cosize(self.a_smem_layout_staged.outer)
],
self.buffer_align_bytes,
]
# (MMA, MMA_N, MMA_K, STAGE)
sB: cute.struct.Align[
cute.struct.MemRange[
self.b_dtype, cute.cosize(self.b_smem_layout_staged.outer)
],
self.buffer_align_bytes,
]
# (MMA, MMA_M, MMA_K, STAGE)
sSFA: cute.struct.Align[
cute.struct.MemRange[
self.sf_dtype, cute.cosize(self.sfa_smem_layout_staged)
],
self.buffer_align_bytes,
]
# (MMA, MMA_N, MMA_K, STAGE)
sSFB: cute.struct.Align[
cute.struct.MemRange[
self.sf_dtype, cute.cosize(self.sfb_smem_layout_staged)
],
self.buffer_align_bytes,
]
self.shared_storage = SharedStorage
# Launch the kernel synchronously
self.kernel(
tiled_mma,
tiled_mma_sfb,
tma_atom_a,
tma_tensor_a,
tma_atom_b,
tma_tensor_b,
tma_atom_sfa,
tma_tensor_sfa,
tma_atom_sfb,
tma_tensor_sfb,
tma_atom_c,
tma_tensor_c,
self.cluster_layout_vmnk,
self.cluster_layout_sfb_vmnk,
self.a_smem_layout_staged,
self.b_smem_layout_staged,
self.sfa_smem_layout_staged,
self.sfb_smem_layout_staged,
self.c_smem_layout_staged,
self.epi_tile,
self.tile_sched_params,
group_count,
problem_shape_mnkl,
strides_abc,
tensor_address_abc,
tensor_address_sfasfb,
tensormap_cute_tensor,
).launch(
grid=grid,
block=[self.threads_per_cta, 1, 1],
cluster=(*self.cluster_shape_mn, 1),
smem=self.shared_storage.size_in_bytes(),
min_blocks_per_mp=1,
)
return
# GPU device kernel
@cute.kernel
def kernel(
self,
tiled_mma: cute.TiledMma,
tiled_mma_sfb: cute.TiledMma,
tma_atom_a: cute.CopyAtom,
mA_mkl: cute.Tensor,
tma_atom_b: cute.CopyAtom,
mB_nkl: cute.Tensor,
tma_atom_sfa: cute.CopyAtom,
mSFA_mkl: cute.Tensor,
tma_atom_sfb: cute.CopyAtom,
mSFB_nkl: cute.Tensor,
tma_atom_c: cute.CopyAtom,
mC_mnl: cute.Tensor,
cluster_layout_vmnk: cute.Layout,
cluster_layout_sfb_vmnk: cute.Layout,
a_smem_layout_staged: cute.ComposedLayout,
b_smem_layout_staged: cute.ComposedLayout,
sfa_smem_layout_staged: cute.Layout,
sfb_smem_layout_staged: cute.Layout,
c_smem_layout_staged: Union[cute.Layout, cute.ComposedLayout],
epi_tile: cute.Tile,
tile_sched_params: utils.PersistentTileSchedulerParams,
group_count: cutlass.Constexpr,
problem_sizes_mnkl: cute.Tensor,
strides_abc: cute.Tensor,
ptrs_abc: cute.Tensor,
ptrs_sfasfb: cute.Tensor,
tensormaps: cute.Tensor,
):
warp_idx = cute.arch.warp_idx()
warp_idx = cute.arch.make_warp_uniform(warp_idx)
if warp_idx == self.tma_warp_id:
cute.nvgpu.cpasync.prefetch_descriptor(tma_atom_a)
cute.nvgpu.cpasync.prefetch_descriptor(tma_atom_b)
cute.nvgpu.cpasync.prefetch_descriptor(tma_atom_sfa)
cute.nvgpu.cpasync.prefetch_descriptor(tma_atom_sfb)
cute.nvgpu.cpasync.prefetch_descriptor(tma_atom_c)
use_2cta_instrs = cute.size(tiled_mma.thr_id.shape) == 2
#
# Setup cta/thread coordinates
#
# Coords inside cluster
bidx, bidy, bidz = cute.arch.block_idx()
mma_tile_coord_v = bidx % cute.size(tiled_mma.thr_id.shape)
is_leader_cta = mma_tile_coord_v == 0
cta_rank_in_cluster = cute.arch.make_warp_uniform(
cute.arch.block_idx_in_cluster()
)
block_in_cluster_coord_vmnk = cluster_layout_vmnk.get_flat_coord(
cta_rank_in_cluster
)
block_in_cluster_coord_sfb_vmnk = cluster_layout_sfb_vmnk.get_flat_coord(
cta_rank_in_cluster
)
# coord inside cta
tidx, _, _ = cute.arch.thread_idx()
#
# Alloc and init: tensormap buffer, a+b full/empty, accumulator full/empty, tensor memory dealloc barrier
#
smem = utils.SmemAllocator()
storage = smem.allocate(self.shared_storage)
tensormap_smem_ptr = storage.tensormap_buffer.data_ptr()
tensormap_a_smem_ptr = tensormap_smem_ptr
tensormap_b_smem_ptr = (
tensormap_a_smem_ptr
+ Sm100GroupedBlockScaledGemmKernel.bytes_per_tensormap // 8
)
tensormap_sfa_smem_ptr = (
tensormap_b_smem_ptr
+ Sm100GroupedBlockScaledGemmKernel.bytes_per_tensormap // 8
)
tensormap_sfb_smem_ptr = (
tensormap_sfa_smem_ptr
+ Sm100GroupedBlockScaledGemmKernel.bytes_per_tensormap // 8
)
tensormap_c_smem_ptr = (
tensormap_sfb_smem_ptr
+ Sm100GroupedBlockScaledGemmKernel.bytes_per_tensormap // 8
)
tmem_dealloc_mbar_ptr = storage.tmem_dealloc_mbar_ptr
tmem_holding_buf = storage.tmem_holding_buf
# Initialize mainloop ab_pipeline (barrier) and states
ab_pipeline_producer_group = pipeline.CooperativeGroup(pipeline.Agent.Thread)
num_tma_producer = self.num_mcast_ctas_a + self.num_mcast_ctas_b - 1
ab_pipeline_consumer_group = pipeline.CooperativeGroup(
pipeline.Agent.Thread, num_tma_producer
)
ab_pipeline = pipeline.PipelineTmaUmma.create(
barrier_storage=storage.ab_full_mbar_ptr.data_ptr(),
num_stages=self.num_ab_stage,
producer_group=ab_pipeline_producer_group,
consumer_group=ab_pipeline_consumer_group,
tx_count=self.num_tma_load_bytes,
cta_layout_vmnk=cluster_layout_vmnk,
)
# Initialize acc_pipeline (barrier) and states
acc_pipeline_producer_group = pipeline.CooperativeGroup(pipeline.Agent.Thread)
num_acc_consumer_threads = len(self.epilog_warp_id) * (
2 if use_2cta_instrs else 1
)
acc_pipeline_consumer_group = pipeline.CooperativeGroup(
pipeline.Agent.Thread, num_acc_consumer_threads
)
acc_pipeline = pipeline.PipelineUmmaAsync.create(
barrier_storage=storage.acc_full_mbar_ptr.data_ptr(),
num_stages=self.num_acc_stage,
producer_group=acc_pipeline_producer_group,
consumer_group=acc_pipeline_consumer_group,
cta_layout_vmnk=cluster_layout_vmnk,
)
# Tensor memory dealloc barrier init
if use_2cta_instrs:
if warp_idx == self.tma_warp_id:
num_tmem_dealloc_threads = 32
with cute.arch.elect_one():
cute.arch.mbarrier_init(
tmem_dealloc_mbar_ptr, num_tmem_dealloc_threads
)
# Cluster arrive after barrier init
pipeline_init_arrive(cluster_shape_mn=self.cluster_shape_mn, is_relaxed=True)
#
# Setup smem tensor A/B/SFA/SFB/C
#
sC = storage.sC.get_tensor(
c_smem_layout_staged.outer, swizzle=c_smem_layout_staged.inner
)
# (MMA, MMA_M, MMA_K, STAGE)
sA = storage.sA.get_tensor(
a_smem_layout_staged.outer, swizzle=a_smem_layout_staged.inner
)
# (MMA, MMA_N, MMA_K, STAGE)
sB = storage.sB.get_tensor(
b_smem_layout_staged.outer, swizzle=b_smem_layout_staged.inner
)
# (MMA, MMA_M, MMA_K, STAGE)
sSFA = storage.sSFA.get_tensor(sfa_smem_layout_staged)
# (MMA, MMA_N, MMA_K, STAGE)
sSFB = storage.sSFB.get_tensor(sfb_smem_layout_staged)
#
# Compute multicast mask for A/B/SFA/SFB buffer full
#
a_full_mcast_mask = None
b_full_mcast_mask = None
sfa_full_mcast_mask = None
sfb_full_mcast_mask = None
if cutlass.const_expr(self.is_a_mcast or self.is_b_mcast or use_2cta_instrs):
a_full_mcast_mask = cpasync.create_tma_multicast_mask(
cluster_layout_vmnk, block_in_cluster_coord_vmnk, mcast_mode=2
)
b_full_mcast_mask = cpasync.create_tma_multicast_mask(
cluster_layout_vmnk, block_in_cluster_coord_vmnk, mcast_mode=1
)
sfa_full_mcast_mask = cpasync.create_tma_multicast_mask(
cluster_layout_vmnk, block_in_cluster_coord_vmnk, mcast_mode=2
)
sfb_full_mcast_mask = cpasync.create_tma_multicast_mask(
cluster_layout_sfb_vmnk, block_in_cluster_coord_sfb_vmnk, mcast_mode=1
)
#
# Local_tile partition global tensors
#
# (bM, bK, RestM, RestK, RestL)
gA_mkl = cute.local_tile(
mA_mkl, cute.slice_(self.mma_tiler, (None, 0, None)), (None, None, None)
)
# (bN, bK, RestN, RestK, RestL)
gB_nkl = cute.local_tile(
mB_nkl, cute.slice_(self.mma_tiler, (0, None, None)), (None, None, None)
)
# (bM, bK, RestM, RestK, RestL)
gSFA_mkl = cute.local_tile(
mSFA_mkl, cute.slice_(self.mma_tiler, (None, 0, None)), (None, None, None)
)
# (bN, bK, RestN, RestK, RestL)
gSFB_nkl = cute.local_tile(
mSFB_nkl, cute.slice_(self.mma_tiler, (0, None, None)), (None, None, None)
)
# (bM, bN, RestM, RestN, RestL)
gC_mnl = cute.local_tile(
mC_mnl, cute.slice_(self.mma_tiler, (None, None, 0)), (None, None, None)
)
#
# Partition global tensor for TiledMMA_A/B/C
#
thr_mma = tiled_mma.get_slice(mma_tile_coord_v)
thr_mma_sfb = tiled_mma_sfb.get_slice(mma_tile_coord_v)
# (MMA, MMA_M, MMA_K, RestM, RestK, RestL)
tCgA = thr_mma.partition_A(gA_mkl)
# (MMA, MMA_N, MMA_K, RestN, RestK, RestL)
tCgB = thr_mma.partition_B(gB_nkl)
# (MMA, MMA_M, MMA_K, RestM, RestK, RestL)
tCgSFA = thr_mma.partition_A(gSFA_mkl)
# (MMA, MMA_N, MMA_K, RestN, RestK, RestL)
tCgSFB = thr_mma_sfb.partition_B(gSFB_nkl)
# (MMA, MMA_M, MMA_N, RestM, RestN, RestL)
tCgC = thr_mma.partition_C(gC_mnl)
#
# Partition global/shared tensor for TMA load A/B
#
# TMA load A partition_S/D
a_cta_layout = cute.make_layout(
cute.slice_(cluster_layout_vmnk, (0, 0, None, 0)).shape
)
# ((atom_v, rest_v), STAGE)
# ((atom_v, rest_v), RestM, RestK, RestL)
tAsA, tAgA = cpasync.tma_partition(
tma_atom_a,
block_in_cluster_coord_vmnk[2],
a_cta_layout,
cute.group_modes(sA, 0, 3),
cute.group_modes(tCgA, 0, 3),
)
# TMA load B partition_S/D
b_cta_layout = cute.make_layout(
cute.slice_(cluster_layout_vmnk, (0, None, 0, 0)).shape
)
# ((atom_v, rest_v), STAGE)
# ((atom_v, rest_v), RestN, RestK, RestL)
tBsB, tBgB = cpasync.tma_partition(
tma_atom_b,
block_in_cluster_coord_vmnk[1],
b_cta_layout,
cute.group_modes(sB, 0, 3),
cute.group_modes(tCgB, 0, 3),
)
# TMALDG_SFA partition_S/D
sfa_cta_layout = a_cta_layout
# ((atom_v, rest_v), STAGE)
# ((atom_v, rest_v), RestM, RestK, RestL)
tAsSFA, tAgSFA = cute.nvgpu.cpasync.tma_partition(
tma_atom_sfa,
block_in_cluster_coord_vmnk[2],
sfa_cta_layout,
cute.group_modes(sSFA, 0, 3),
cute.group_modes(tCgSFA, 0, 3),
)
tAsSFA = cute.filter_zeros(tAsSFA)
tAgSFA = cute.filter_zeros(tAgSFA)
# TMALDG_SFB partition_S/D
sfb_cta_layout = cute.make_layout(
cute.slice_(cluster_layout_sfb_vmnk, (0, None, 0, 0)).shape
)
# ((atom_v, rest_v), STAGE)
# ((atom_v, rest_v), RestN, RestK, RestL)
tBsSFB, tBgSFB = cute.nvgpu.cpasync.tma_partition(
tma_atom_sfb,
block_in_cluster_coord_sfb_vmnk[1],
sfb_cta_layout,
cute.group_modes(sSFB, 0, 3),
cute.group_modes(tCgSFB, 0, 3),
)
tBsSFB = cute.filter_zeros(tBsSFB)
tBgSFB = cute.filter_zeros(tBgSFB)
#
# Partition shared/tensor memory tensor for TiledMMA_A/B/C
#
# (MMA, MMA_M, MMA_K, STAGE)
tCrA = tiled_mma.make_fragment_A(sA)
# (MMA, MMA_N, MMA_K, STAGE)
tCrB = tiled_mma.make_fragment_B(sB)
# (MMA, MMA_M, MMA_N)
acc_shape = tiled_mma.partition_shape_C(self.mma_tiler[:2])
# (MMA, MMA_M, MMA_N, STAGE)
tCtAcc_fake = tiled_mma.make_fragment_C(
cute.append(acc_shape, self.num_acc_stage)
)
#
# Cluster wait before tensor memory alloc
#
pipeline_init_wait(cluster_shape_mn=self.cluster_shape_mn)
#
# Get tensormap buffer address
#
grid_dim = cute.arch.grid_dim()
tensormap_workspace_idx = (
bidz * grid_dim[1] * grid_dim[0] + bidy * grid_dim[0] + bidx
)
tensormap_manager = utils.TensorMapManager(
utils.TensorMapUpdateMode.SMEM,
Sm100GroupedBlockScaledGemmKernel.bytes_per_tensormap,
)
tensormap_a_gmem_ptr = tensormap_manager.get_tensormap_ptr(
tensormaps[(tensormap_workspace_idx, 0, None)].iterator
)
tensormap_b_gmem_ptr = tensormap_manager.get_tensormap_ptr(
tensormaps[(tensormap_workspace_idx, 1, None)].iterator
)
tensormap_sfa_gmem_ptr = tensormap_manager.get_tensormap_ptr(
tensormaps[(tensormap_workspace_idx, 2, None)].iterator
)
tensormap_sfb_gmem_ptr = tensormap_manager.get_tensormap_ptr(
tensormaps[(tensormap_workspace_idx, 3, None)].iterator
)
tensormap_c_gmem_ptr = tensormap_manager.get_tensormap_ptr(
tensormaps[(tensormap_workspace_idx, 4, None)].iterator
)
#
# Persistent tile scheduling loop
#
# When the problem shapes are on device, we launch one CTA per SM.
# The if condition later prevents the warps from extra CTAs from doing any work.
# Using StaticPersistentTileScheduler with GroupedGemmTileSchedulerHelper
# for group search functionality
tile_sched = utils.StaticPersistentTileScheduler.create(
tile_sched_params,
cute.arch.block_idx(),
grid_dim,
)
# Create helper for grouped GEMM tile coordinate delinearization
group_helper = utils.GroupedGemmTileSchedulerHelper(
group_count,
tile_sched_params,
self.cluster_tile_shape_mnk,
utils.create_initial_search_state(),
)
# Get initial work tile info and convert to grouped format
base_work_tile = tile_sched.initial_work_tile_info()
group_search_result = group_helper.delinearize_z(
base_work_tile.tile_idx,
problem_sizes_mnkl,
)
initial_work_tile_info = GroupedWorkTileInfo(
base_work_tile.tile_idx,
base_work_tile.is_valid_tile,
group_search_result,
)
#
# Specialized TMA load warp
#
if warp_idx == self.tma_warp_id and initial_work_tile_info.is_valid_tile:
#
# Persistent tile scheduling loop
#
work_tile = initial_work_tile_info
tensormap_init_done = cutlass.Boolean(False)
# group index of last tile
last_group_idx = cutlass.Int32(-1)
ab_producer_state = pipeline.make_pipeline_state(
pipeline.PipelineUserType.Producer, self.num_ab_stage
)
while work_tile.is_valid_tile:
grouped_gemm_cta_tile_info = work_tile.group_search_result
cur_k_tile_cnt = grouped_gemm_cta_tile_info.cta_tile_count_k
cur_group_idx = grouped_gemm_cta_tile_info.group_idx
is_k_tile_cnt_zero = cur_k_tile_cnt == 0
# Do not load any data if cur_k_tile_cnt is 0
if not is_k_tile_cnt_zero:
is_group_changed = cur_group_idx != last_group_idx
# skip tensormap update if we're working on the same group
if is_group_changed:
real_tensor_a = self.make_tensor_abc_for_tensormap_update(
cur_group_idx,
self.a_dtype,
(
grouped_gemm_cta_tile_info.problem_shape_m,
grouped_gemm_cta_tile_info.problem_shape_n,
grouped_gemm_cta_tile_info.problem_shape_k,
),
strides_abc,
ptrs_abc,
0, # 0 for tensor A
)
real_tensor_b = self.make_tensor_abc_for_tensormap_update(
cur_group_idx,
self.b_dtype,
(
grouped_gemm_cta_tile_info.problem_shape_m,
grouped_gemm_cta_tile_info.problem_shape_n,
grouped_gemm_cta_tile_info.problem_shape_k,
),
strides_abc,
ptrs_abc,
1, # 1 for tensor B
)
real_tensor_sfa = self.make_tensor_sfasfb_for_tensormap_update(
cur_group_idx,
self.sf_dtype,
(
grouped_gemm_cta_tile_info.problem_shape_m,
grouped_gemm_cta_tile_info.problem_shape_n,
grouped_gemm_cta_tile_info.problem_shape_k,
),
ptrs_sfasfb,
0, # 0 for tensor SFA
)
real_tensor_sfb = self.make_tensor_sfasfb_for_tensormap_update(
cur_group_idx,
self.sf_dtype,
(
grouped_gemm_cta_tile_info.problem_shape_m,
grouped_gemm_cta_tile_info.problem_shape_n,
grouped_gemm_cta_tile_info.problem_shape_k,
),
ptrs_sfasfb,
1, # 1 for tensor SFB
)
if not tensormap_init_done:
# wait tensormap initialization complete
self.tensormap_ab_init_barrier.arrive_and_wait()
tensormap_init_done = True
tensormap_manager.update_tensormap(
(
real_tensor_a,
real_tensor_b,
real_tensor_sfa,
real_tensor_sfb,
),
(tma_atom_a, tma_atom_b, tma_atom_sfa, tma_atom_sfb),
(
tensormap_a_gmem_ptr,
tensormap_b_gmem_ptr,
tensormap_sfa_gmem_ptr,
tensormap_sfb_gmem_ptr,
),
self.tma_warp_id,
(
tensormap_a_smem_ptr,
tensormap_b_smem_ptr,
tensormap_sfa_smem_ptr,
tensormap_sfb_smem_ptr,
),
)
mma_tile_coord_mnl = (
grouped_gemm_cta_tile_info.cta_tile_idx_m
// cute.size(tiled_mma.thr_id.shape),
grouped_gemm_cta_tile_info.cta_tile_idx_n,
0,
)
#
# Slice to per mma tile index
#
# ((atom_v, rest_v), RestK)
tAgA_slice = tAgA[
(None, mma_tile_coord_mnl[0], None, mma_tile_coord_mnl[2])
]
# ((atom_v, rest_v), RestK)
tBgB_slice = tBgB[
(None, mma_tile_coord_mnl[1], None, mma_tile_coord_mnl[2])
]
# ((atom_v, rest_v), RestK)
tAgSFA_slice = tAgSFA[
(None, mma_tile_coord_mnl[0], None, mma_tile_coord_mnl[2])
]
# ((atom_v, rest_v), RestK)
tBgSFB_slice = tBgSFB[
(None, mma_tile_coord_mnl[1], None, mma_tile_coord_mnl[2])
]
# Peek (try_wait) AB buffer empty for k_tile = prefetch_k_tile_cnt
ab_producer_state.reset_count()
peek_ab_empty_status = cutlass.Boolean(1)
if ab_producer_state.count < cur_k_tile_cnt:
peek_ab_empty_status = ab_pipeline.producer_try_acquire(
ab_producer_state
)
if is_group_changed:
tensormap_manager.fence_tensormap_update(tensormap_a_gmem_ptr)
tensormap_manager.fence_tensormap_update(tensormap_b_gmem_ptr)
tensormap_manager.fence_tensormap_update(tensormap_sfa_gmem_ptr)
tensormap_manager.fence_tensormap_update(tensormap_sfb_gmem_ptr)
#
# Tma load loop
#
for k_tile in cutlass.range(0, cur_k_tile_cnt, 1, unroll=1):
# Conditionally wait for AB buffer empty
ab_pipeline.producer_acquire(
ab_producer_state, peek_ab_empty_status
)
# TMA load A/B/SFA/SFB
cute.copy(
tma_atom_a,
tAgA_slice[(None, ab_producer_state.count)],
tAsA[(None, ab_producer_state.index)],
tma_bar_ptr=ab_pipeline.producer_get_barrier(
ab_producer_state
),
mcast_mask=a_full_mcast_mask,
tma_desc_ptr=tensormap_manager.get_tensormap_ptr(
tensormap_a_gmem_ptr,
cute.AddressSpace.generic,
),
)
cute.copy(
tma_atom_b,
tBgB_slice[(None, ab_producer_state.count)],
tBsB[(None, ab_producer_state.index)],
tma_bar_ptr=ab_pipeline.producer_get_barrier(
ab_producer_state
),
mcast_mask=b_full_mcast_mask,
tma_desc_ptr=tensormap_manager.get_tensormap_ptr(
tensormap_b_gmem_ptr,
cute.AddressSpace.generic,
),
)
cute.copy(
tma_atom_sfa,
tAgSFA_slice[(None, ab_producer_state.count)],
tAsSFA[(None, ab_producer_state.index)],
tma_bar_ptr=ab_pipeline.producer_get_barrier(
ab_producer_state
),
mcast_mask=sfa_full_mcast_mask,
tma_desc_ptr=tensormap_manager.get_tensormap_ptr(
tensormap_sfa_gmem_ptr,
cute.AddressSpace.generic,
),
)
cute.copy(
tma_atom_sfb,
tBgSFB_slice[(None, ab_producer_state.count)],
tBsSFB[(None, ab_producer_state.index)],
tma_bar_ptr=ab_pipeline.producer_get_barrier(
ab_producer_state
),
mcast_mask=sfb_full_mcast_mask,
tma_desc_ptr=tensormap_manager.get_tensormap_ptr(
tensormap_sfb_gmem_ptr,
cute.AddressSpace.generic,
),
)
# Peek (try_wait) AB buffer empty for k_tile = prefetch_k_tile_cnt + k_tile + 1
ab_producer_state.advance()
peek_ab_empty_status = cutlass.Boolean(1)
if ab_producer_state.count < cur_k_tile_cnt:
peek_ab_empty_status = ab_pipeline.producer_try_acquire(
ab_producer_state
)
else:
if not tensormap_init_done:
# wait tensormap initialization complete
self.tensormap_ab_init_barrier.arrive_and_wait()
tensormap_init_done = True
#
# Advance to next tile
#
tile_sched.advance_to_next_work()
base_work_tile = tile_sched.get_current_work()
group_search_result = group_helper.delinearize_z(
base_work_tile.tile_idx,
problem_sizes_mnkl,
)
work_tile = GroupedWorkTileInfo(
base_work_tile.tile_idx,
base_work_tile.is_valid_tile,
group_search_result,
)
last_group_idx = cur_group_idx
#
# Wait A/B buffer empty
#
ab_pipeline.producer_tail(ab_producer_state)
#
# Specialized MMA warp
#
if warp_idx == self.mma_warp_id and initial_work_tile_info.is_valid_tile:
#
# Initialize tensormaps for A, B, SFA and SFB
#
tensormap_manager.init_tensormap_from_atom(
tma_atom_a, tensormap_a_smem_ptr, self.mma_warp_id
)
tensormap_manager.init_tensormap_from_atom(
tma_atom_b, tensormap_b_smem_ptr, self.mma_warp_id
)
tensormap_manager.init_tensormap_from_atom(
tma_atom_sfa, tensormap_sfa_smem_ptr, self.mma_warp_id
)
tensormap_manager.init_tensormap_from_atom(
tma_atom_sfb, tensormap_sfb_smem_ptr, self.mma_warp_id
)
# indicate tensormap initialization has finished
self.tensormap_ab_init_barrier.arrive_and_wait()
#
# Bar sync for retrieve tensor memory ptr from shared mem
#
self.tmem_alloc_barrier.arrive_and_wait()
#
# Retrieving tensor memory ptr and make accumulator/SFA/SFB tensor
#
# Make accumulator tmem tensor
acc_tmem_ptr = cute.arch.retrieve_tmem_ptr(
self.acc_dtype,
alignment=16,
ptr_to_buffer_holding_addr=tmem_holding_buf,
)
# (MMA, MMA_M, MMA_N, STAGE)
tCtAcc_base = cute.make_tensor(acc_tmem_ptr, tCtAcc_fake.layout)
# Make SFA tmem tensor
sfa_tmem_ptr = cute.recast_ptr(
acc_tmem_ptr + tcgen05.find_tmem_tensor_col_offset(tCtAcc_base),
dtype=self.sf_dtype,
)
# (MMA, MMA_M, MMA_K)
tCtSFA_layout = blockscaled_utils.make_tmem_layout_sfa(
tiled_mma,
self.mma_tiler,
self.sf_vec_size,
cute.slice_(sfa_smem_layout_staged, (None, None, None, 0)),
)
tCtSFA = cute.make_tensor(sfa_tmem_ptr, tCtSFA_layout)
# Make SFB tmem tensor
sfb_tmem_ptr = cute.recast_ptr(
acc_tmem_ptr
+ tcgen05.find_tmem_tensor_col_offset(tCtAcc_base)
+ tcgen05.find_tmem_tensor_col_offset(tCtSFA),
dtype=self.sf_dtype,
)
# (MMA, MMA_N, MMA_K)
tCtSFB_layout = blockscaled_utils.make_tmem_layout_sfb(
tiled_mma,
self.mma_tiler,
self.sf_vec_size,
cute.slice_(sfb_smem_layout_staged, (None, None, None, 0)),
)
tCtSFB = cute.make_tensor(sfb_tmem_ptr, tCtSFB_layout)
#
# Partition for S2T copy of SFA/SFB
#
tiled_copy_s2t_sfa, tCsSFA_compact_s2t, tCtSFA_compact_s2t = (
self.mainloop_s2t_copy_and_partition(sSFA, tCtSFA)
)
tiled_copy_s2t_sfb, tCsSFB_compact_s2t, tCtSFB_compact_s2t = (
self.mainloop_s2t_copy_and_partition(sSFB, tCtSFB)
)
#
# Persistent tile scheduling loop
#
work_tile = initial_work_tile_info
ab_consumer_state = pipeline.make_pipeline_state(
pipeline.PipelineUserType.Consumer, self.num_ab_stage
)
acc_producer_state = pipeline.make_pipeline_state(
pipeline.PipelineUserType.Producer, self.num_acc_stage
)
while work_tile.is_valid_tile:
cur_group_idx = work_tile.group_search_result.group_idx
problem_shape_k = work_tile.group_search_result.problem_shape_k
# MMA warp is only interested in number of tiles along K dimension
cur_k_tile_cnt = (
problem_shape_k + self.cluster_tile_shape_mnk[2] - 1
) // self.cluster_tile_shape_mnk[2]
is_k_tile_cnt_zero = cur_k_tile_cnt == 0
# (MMA, MMA_M, MMA_N)
tCtAcc = tCtAcc_base[(None, None, None, acc_producer_state.index)]
# Peek (try_wait) AB buffer full for k_tile = 0
ab_consumer_state.reset_count()
peek_ab_full_status = cutlass.Boolean(1)
if ab_consumer_state.count < cur_k_tile_cnt and is_leader_cta:
peek_ab_full_status = ab_pipeline.consumer_try_wait(
ab_consumer_state
)
#
# Wait for accumulator buffer empty
#
if is_leader_cta and not is_k_tile_cnt_zero:
acc_pipeline.producer_acquire(acc_producer_state)
#
# Reset the ACCUMULATE field for each tile
#
tiled_mma.set(tcgen05.Field.ACCUMULATE, False)
#
# Mma mainloop
#
for k_tile in range(cur_k_tile_cnt):
if is_leader_cta:
# Conditionally wait for AB buffer full
ab_pipeline.consumer_wait(
ab_consumer_state, peek_ab_full_status
)
# Copy SFA/SFB from smem to tmem
s2t_stage_coord = (
None,
None,
None,
None,
ab_consumer_state.index,
)
tCsSFA_compact_s2t_staged = tCsSFA_compact_s2t[s2t_stage_coord]
tCsSFB_compact_s2t_staged = tCsSFB_compact_s2t[s2t_stage_coord]
cute.copy(
tiled_copy_s2t_sfa,
tCsSFA_compact_s2t_staged,
tCtSFA_compact_s2t,
)
cute.copy(
tiled_copy_s2t_sfb,
tCsSFB_compact_s2t_staged,
tCtSFB_compact_s2t,
)
# tCtAcc += tCrA * tCrSFA * tCrB * tCrSFB
num_kblocks = cute.size(tCrA, mode=[2])
for kblock_idx in cutlass.range(num_kblocks, unroll_full=True):
kblock_coord = (
None,
None,
kblock_idx,
ab_consumer_state.index,
)
# Set SFA/SFB tensor to tiled_mma
sf_kblock_coord = (None, None, kblock_idx)
tiled_mma.set(
tcgen05.Field.SFA,
tCtSFA[sf_kblock_coord].iterator,
)
tiled_mma.set(
tcgen05.Field.SFB,
tCtSFB[sf_kblock_coord].iterator,
)
cute.gemm(
tiled_mma,
tCtAcc,
tCrA[kblock_coord],
tCrB[kblock_coord],
tCtAcc,
)
# Enable accumulate on tCtAcc after first kblock
tiled_mma.set(tcgen05.Field.ACCUMULATE, True)
# Async arrive AB buffer empty
ab_pipeline.consumer_release(ab_consumer_state)
# Peek (try_wait) AB buffer full for k_tile = k_tile + 1
ab_consumer_state.advance()
peek_ab_full_status = cutlass.Boolean(1)
if ab_consumer_state.count < cur_k_tile_cnt:
if is_leader_cta:
peek_ab_full_status = ab_pipeline.consumer_try_wait(
ab_consumer_state
)
#
# Async arrive accumulator buffer full
#
if not is_k_tile_cnt_zero:
if is_leader_cta:
acc_pipeline.producer_commit(acc_producer_state)
acc_producer_state.advance()
#
# Advance to next tile
#
tile_sched.advance_to_next_work()
base_work_tile = tile_sched.get_current_work()
group_search_result = group_helper.delinearize_z(
base_work_tile.tile_idx,
problem_sizes_mnkl,
)
work_tile = GroupedWorkTileInfo(
base_work_tile.tile_idx,
base_work_tile.is_valid_tile,
group_search_result,
)
#
# Wait for accumulator buffer empty
#
acc_pipeline.producer_tail(acc_producer_state)
#
# Specialized epilogue warps
#
if warp_idx < self.mma_warp_id and initial_work_tile_info.is_valid_tile:
# initialize tensorap for C
tensormap_manager.init_tensormap_from_atom(
tma_atom_c,
tensormap_c_smem_ptr,
self.epilog_warp_id[0],
)
#
# Alloc tensor memory buffer
#
if warp_idx == self.epilog_warp_id[0]:
cute.arch.alloc_tmem(
self.num_tmem_alloc_cols,
tmem_holding_buf,
is_two_cta=use_2cta_instrs,
)
#
# Bar sync for retrieve tensor memory ptr from shared memory
#
self.tmem_alloc_barrier.arrive_and_wait()
#
# Retrieving tensor memory ptr and make accumulator tensor
#
acc_tmem_ptr = cute.arch.retrieve_tmem_ptr(
self.acc_dtype,
alignment=16,
ptr_to_buffer_holding_addr=tmem_holding_buf,
)
# (MMA, MMA_M, MMA_N, STAGE)
tCtAcc_base = cute.make_tensor(acc_tmem_ptr, tCtAcc_fake.layout)
### Start from here
#
# Partition for epilogue
#
epi_tidx = tidx
tiled_copy_t2r, tTR_tAcc_base, tTR_rAcc = (
self.epilog_tmem_copy_and_partition(
epi_tidx, tCtAcc_base, tCgC, epi_tile, use_2cta_instrs
)
)
tTR_rC = cute.make_rmem_tensor(tTR_rAcc.shape, self.c_dtype)
tiled_copy_r2s, tRS_rC, tRS_sC = self.epilog_smem_copy_and_partition(
tiled_copy_t2r, tTR_rC, epi_tidx, sC
)
tma_atom_c, bSG_sC, bSG_gC_partitioned = (
self.epilog_gmem_copy_and_partition(
epi_tidx, tma_atom_c, tCgC, epi_tile, sC
)
)
#
# Persistent tile scheduling loop
#
work_tile = initial_work_tile_info
acc_consumer_state = pipeline.make_pipeline_state(
pipeline.PipelineUserType.Consumer, self.num_acc_stage
)
# Threads/warps participating in tma store pipeline
c_producer_group = pipeline.CooperativeGroup(
pipeline.Agent.Thread,
32 * len(self.epilog_warp_id),
)
c_pipeline = pipeline.PipelineTmaStore.create(
num_stages=self.num_c_stage,
producer_group=c_producer_group,
)
# group index to start searching
last_group_idx = cutlass.Int32(-1)
while work_tile.is_valid_tile:
grouped_gemm_cta_tile_info = work_tile.group_search_result
cur_group_idx = grouped_gemm_cta_tile_info.group_idx
cur_k_tile_cnt = grouped_gemm_cta_tile_info.cta_tile_count_k
is_k_tile_cnt_zero = cur_k_tile_cnt == 0
is_group_changed = cur_group_idx != last_group_idx
# We still need to store 0s when k_tile_cnt is 0
if is_group_changed:
# construct tensor c based on real shape, stride information
real_tensor_c = self.make_tensor_abc_for_tensormap_update(
cur_group_idx,
self.c_dtype,
(
grouped_gemm_cta_tile_info.problem_shape_m,
grouped_gemm_cta_tile_info.problem_shape_n,
grouped_gemm_cta_tile_info.problem_shape_k,
),
strides_abc,
ptrs_abc,
2, # 2 for tensor C
)
tensormap_manager.update_tensormap(
((real_tensor_c),),
((tma_atom_c),),
((tensormap_c_gmem_ptr),),
self.epilog_warp_id[0],
(tensormap_c_smem_ptr,),
)
mma_tile_coord_mnl = (
grouped_gemm_cta_tile_info.cta_tile_idx_m
// cute.size(tiled_mma.thr_id.shape),
grouped_gemm_cta_tile_info.cta_tile_idx_n,
0,
)
#
# Slice to per mma tile index
#
# ((ATOM_V, REST_V), EPI_M, EPI_N)
bSG_gC = bSG_gC_partitioned[
(
None,
None,
None,
*mma_tile_coord_mnl,
)
]
# Set tensor memory buffer for current tile
# (T2R, T2R_M, T2R_N, EPI_M, EPI_M)
tTR_tAcc = tTR_tAcc_base[
(None, None, None, None, None, acc_consumer_state.index)
]
#
# Wait for accumulator buffer full
#
if not is_k_tile_cnt_zero:
acc_pipeline.consumer_wait(acc_consumer_state)
tTR_tAcc = cute.group_modes(tTR_tAcc, 3, cute.rank(tTR_tAcc))
bSG_gC = cute.group_modes(bSG_gC, 1, cute.rank(bSG_gC))
if is_group_changed:
if warp_idx == self.epilog_warp_id[0]:
tensormap_manager.fence_tensormap_update(tensormap_c_gmem_ptr)
#
# Store accumulator to global memory in subtiles
#
subtile_cnt = cute.size(tTR_tAcc.shape, mode=[3])
num_prev_subtiles = tile_sched.num_tiles_executed * subtile_cnt
for subtile_idx in range(subtile_cnt):
if not is_k_tile_cnt_zero:
#
# Load accumulator from tensor memory buffer to register
#
tTR_tAcc_mn = tTR_tAcc[(None, None, None, subtile_idx)]
cute.copy(tiled_copy_t2r, tTR_tAcc_mn, tTR_rAcc)
#
# Convert to C type
#
acc_vec = tiled_copy_r2s.retile(tTR_rAcc).load()
tRS_rC.store(acc_vec.to(self.c_dtype))
else:
if cutlass.const_expr(self.is_nvfp4_output):
zeros_i8 = cute.make_rmem_tensor(
cute.recast_layout(
cutlass.Int8.width,
self.c_dtype.width,
tRS_rC.layout,
),
cutlass.Int8,
)
zeros_i8.fill(0)
tRS_rC.store(
cute.recast_tensor(zeros_i8, self.c_dtype).load()
)
else:
tRS_rC.fill(0)
#
# Store C to shared memory
#
c_buffer = (num_prev_subtiles + subtile_idx) % self.num_c_stage
cute.copy(
tiled_copy_r2s,
tRS_rC,
tRS_sC[(None, None, None, c_buffer)],
)
# Fence and barrier to make sure shared memory store is visible to TMA store
cute.arch.fence_proxy(
cute.arch.ProxyKind.async_shared,
space=cute.arch.SharedSpace.shared_cta,
)
self.epilog_sync_barrier.arrive_and_wait()
#
# TMA store C to global memory
#
if warp_idx == self.epilog_warp_id[0]:
cute.copy(
tma_atom_c,
bSG_sC[(None, c_buffer)],
bSG_gC[(None, subtile_idx)],
tma_desc_ptr=tensormap_manager.get_tensormap_ptr(
tensormap_c_gmem_ptr,
cute.AddressSpace.generic,
),
)
# Fence and barrier to make sure shared memory store is visible to TMA store
c_pipeline.producer_commit()
c_pipeline.producer_acquire()
self.epilog_sync_barrier.arrive_and_wait()
#
# Async arrive accumulator buffer empty
#
if not is_k_tile_cnt_zero:
with cute.arch.elect_one():
acc_pipeline.consumer_release(acc_consumer_state)
acc_consumer_state.advance()
#
# Advance to next tile
#
tile_sched.advance_to_next_work()
base_work_tile = tile_sched.get_current_work()
group_search_result = group_helper.delinearize_z(
base_work_tile.tile_idx,
problem_sizes_mnkl,
)
work_tile = GroupedWorkTileInfo(
base_work_tile.tile_idx,
base_work_tile.is_valid_tile,
group_search_result,
)
last_group_idx = cur_group_idx
#
# Dealloc the tensor memory buffer
#
if warp_idx == self.epilog_warp_id[0]:
cute.arch.relinquish_tmem_alloc_permit(is_two_cta=use_2cta_instrs)
self.epilog_sync_barrier.arrive_and_wait()
if warp_idx == self.epilog_warp_id[0]:
if use_2cta_instrs:
cute.arch.mbarrier_arrive(
tmem_dealloc_mbar_ptr, cta_rank_in_cluster ^ 1
)
cute.arch.mbarrier_wait(tmem_dealloc_mbar_ptr, 0)
cute.arch.dealloc_tmem(
acc_tmem_ptr, self.num_tmem_alloc_cols, is_two_cta=use_2cta_instrs
)
#
# Wait for C store complete
#
c_pipeline.producer_tail()
@cute.jit
def make_tensor_abc_for_tensormap_update(
self,
group_idx: cutlass.Int32,
dtype: Type[cutlass.Numeric],
problem_shape_mnk: tuple[cutlass.Int32, cutlass.Int32, cutlass.Int32],
strides_abc: cute.Tensor,
tensor_address_abc: cute.Tensor,
tensor_index: int,
):
ptr_i64 = tensor_address_abc[(group_idx, tensor_index)]
if cutlass.const_expr(
not isclass(dtype) or not issubclass(dtype, cutlass.Numeric)
):
raise TypeError(
f"dtype must be a type of cutlass.Numeric, got {type(dtype)}"
)
tensor_gmem_ptr = cute.make_ptr(
dtype, ptr_i64, cute.AddressSpace.gmem, assumed_align=16
)
strides_tensor_gmem = strides_abc[(group_idx, tensor_index, None)]
strides_tensor_reg = cute.make_rmem_tensor(
cute.make_layout(2),
strides_abc.element_type,
)
cute.autovec_copy(strides_tensor_gmem, strides_tensor_reg)
stride_mn = strides_tensor_reg[0]
stride_k = strides_tensor_reg[1]
c1 = cutlass.Int32(1)
c0 = cutlass.Int32(0)
if cutlass.const_expr(tensor_index == 0): # tensor A
m = problem_shape_mnk[0]
k = problem_shape_mnk[2]
return cute.make_tensor(
tensor_gmem_ptr,
cute.make_layout((m, k, c1), stride=(stride_mn, stride_k, c0)),
)
elif cutlass.const_expr(tensor_index == 1): # tensor B
n = problem_shape_mnk[1]
k = problem_shape_mnk[2]
return cute.make_tensor(
tensor_gmem_ptr,
cute.make_layout((n, k, c1), stride=(stride_mn, stride_k, c0)),
)
else: # tensor C
m = problem_shape_mnk[0]
n = problem_shape_mnk[1]
return cute.make_tensor(
tensor_gmem_ptr,
cute.make_layout((m, n, c1), stride=(stride_mn, stride_k, c0)),
)
@cute.jit
def make_tensor_sfasfb_for_tensormap_update(
self,
group_idx: cutlass.Int32,
dtype: Type[cutlass.Numeric],
problem_shape_mnk: tuple[cutlass.Int32, cutlass.Int32, cutlass.Int32],
tensor_address_sfasfb: cute.Tensor,
tensor_index: int,
):
ptr_i64 = tensor_address_sfasfb[(group_idx, tensor_index)]
if cutlass.const_expr(
not isclass(dtype) or not issubclass(dtype, cutlass.Numeric)
):
raise TypeError(
f"dtype must be a type of cutlass.Numeric, got {type(dtype)}"
)
tensor_gmem_ptr = cute.make_ptr(
dtype, ptr_i64, cute.AddressSpace.gmem, assumed_align=16
)
c1 = cutlass.Int32(1)
if cutlass.const_expr(tensor_index == 0): # tensor SFA
m = problem_shape_mnk[0]
k = problem_shape_mnk[2]
sfa_layout = blockscaled_utils.tile_atom_to_shape_SF(
(m, k, c1), self.sf_vec_size
)
return cute.make_tensor(
tensor_gmem_ptr,
sfa_layout,
)
else: # tensor SFB
n = problem_shape_mnk[1]
k = problem_shape_mnk[2]
sfb_layout = blockscaled_utils.tile_atom_to_shape_SF(
(n, k, c1), self.sf_vec_size
)
return cute.make_tensor(
tensor_gmem_ptr,
sfb_layout,
)
def mainloop_s2t_copy_and_partition(self, sSF: cute.Tensor, tSF: cute.Tensor) -> Tuple[cute.TiledCopy, cute.Tensor, cute.Tensor]:
tCsSF_compact = cute.filter_zeros(sSF)
tCtSF_compact = cute.filter_zeros(tSF)
# Make S2T CopyAtom and tiledCopy
copy_atom_s2t = cute.make_copy_atom(
tcgen05.Cp4x32x128bOp(self.cta_group),
self.sf_dtype,
)
tiled_copy_s2t = tcgen05.make_s2t_copy(copy_atom_s2t, tCtSF_compact)
thr_copy_s2t = tiled_copy_s2t.get_slice(0)
# ((ATOM_V, REST_V), Rest_Tiler, MMA_MN, MMA_K, STAGE)
tCsSF_compact_s2t_ = thr_copy_s2t.partition_S(tCsSF_compact)
# ((ATOM_V, REST_V), Rest_Tiler, MMA_MN, MMA_K, STAGE)
tCsSF_compact_s2t = tcgen05.get_s2t_smem_desc_tensor(
tiled_copy_s2t, tCsSF_compact_s2t_
)
# ((ATOM_V, REST_V), Rest_Tiler, MMA_MN, MMA_K)
tCtSF_compact_s2t = thr_copy_s2t.partition_D(tCtSF_compact)
return tiled_copy_s2t, tCsSF_compact_s2t, tCtSF_compact_s2t
def epilog_tmem_copy_and_partition(
self, tidx: cutlass.Int32, tAcc: cute.Tensor, gC_mnl: cute.Tensor,
epi_tile: cute.Tile, use_2cta_instrs: Union[cutlass.Boolean, bool],
) -> Tuple[cute.TiledCopy, cute.Tensor, cute.Tensor]:
copy_atom_t2r = sm100_utils.get_tmem_load_op(
self.cta_tile_shape_mnk,
self.c_layout,
self.c_dtype,
self.acc_dtype,
epi_tile,
use_2cta_instrs,
)
# (EPI_TILE_M, EPI_TILE_N, EPI_M, EPI_N, STAGE)
tAcc_epi = cute.flat_divide(
tAcc[((None, None), 0, 0, None)],
epi_tile,
)
# (EPI_TILE_M, EPI_TILE_N)
tiled_copy_t2r = tcgen05.make_tmem_copy(
copy_atom_t2r, tAcc_epi[(None, None, 0, 0, 0)]
)
thr_copy_t2r = tiled_copy_t2r.get_slice(tidx)
# (T2R, T2R_M, T2R_N, EPI_M, EPI_M, STAGE)
tTR_tAcc = thr_copy_t2r.partition_S(tAcc_epi)
# (EPI_TILE_M, EPI_TILE_N, EPI_M, EPI_N, RestM, RestN, RestL)
gC_mnl_epi = cute.flat_divide(
gC_mnl[((None, None), 0, 0, None, None, None)], epi_tile
)
# (T2R, T2R_M, T2R_N, EPI_M, EPI_N, RestM, RestN, RestL)
tTR_gC = thr_copy_t2r.partition_D(gC_mnl_epi)
# (T2R, T2R_M, T2R_N)
tTR_rAcc = cute.make_rmem_tensor(
tTR_gC[(None, None, None, 0, 0, 0, 0, 0)].shape, self.acc_dtype
)
return tiled_copy_t2r, tTR_tAcc, tTR_rAcc
def epilog_smem_copy_and_partition(
self, tiled_copy_t2r: cute.TiledCopy, tTR_rC: cute.Tensor,
tidx: cutlass.Int32, sC: cute.Tensor,
) -> Tuple[cute.TiledCopy, cute.Tensor, cute.Tensor]:
copy_atom_r2s = sm100_utils.get_smem_store_op(
self.c_layout, self.c_dtype, self.acc_dtype, tiled_copy_t2r
)
tiled_copy_r2s = cute.make_tiled_copy_D(copy_atom_r2s, tiled_copy_t2r)
# (R2S, R2S_M, R2S_N, PIPE_D)
thr_copy_r2s = tiled_copy_r2s.get_slice(tidx)
tRS_sC = thr_copy_r2s.partition_D(sC)
# (R2S, R2S_M, R2S_N)
tRS_rC = tiled_copy_r2s.retile(tTR_rC)
return tiled_copy_r2s, tRS_rC, tRS_sC
def epilog_gmem_copy_and_partition(
self, tidx: cutlass.Int32, atom: Union[cute.CopyAtom, cute.TiledCopy],
gC_mnl: cute.Tensor, epi_tile: cute.Tile, sC: cute.Tensor,
) -> Tuple[cute.CopyAtom, cute.Tensor, cute.Tensor]:
gC_epi = cute.flat_divide(
gC_mnl[((None, None), 0, 0, None, None, None)], epi_tile
)
tma_atom_c = atom
sC_for_tma_partition = cute.group_modes(sC, 0, 2)
gC_for_tma_partition = cute.group_modes(gC_epi, 0, 2)
# ((ATOM_V, REST_V), EPI_M, EPI_N)
# ((ATOM_V, REST_V), EPI_M, EPI_N, RestM, RestN, RestL)
bSG_sC, bSG_gC = cpasync.tma_partition(
tma_atom_c,
0,
cute.make_layout(1),
sC_for_tma_partition,
gC_for_tma_partition,
)
return tma_atom_c, bSG_sC, bSG_gC
@staticmethod
def _compute_stages(
tiled_mma: cute.TiledMma, mma_tiler_mnk: Tuple[int, int, int],
a_dtype: Type[cutlass.Numeric], b_dtype: Type[cutlass.Numeric],
epi_tile: cute.Tile, c_dtype: Type[cutlass.Numeric],
c_layout: utils.LayoutEnum, sf_dtype: Type[cutlass.Numeric],
sf_vec_size: int, smem_capacity: int, occupancy: int,
) -> Tuple[int, int, int]:
num_acc_stage = 1 if mma_tiler_mnk[1] == 256 else 2
num_c_stage = 2
# Calculate smem layout and size for one stage of A, B, SFA, SFB and C
a_smem_layout_stage_one = sm100_utils.make_smem_layout_a(
tiled_mma,
mma_tiler_mnk,
a_dtype,
1, # a tmp 1 stage is provided
)
b_smem_layout_staged_one = sm100_utils.make_smem_layout_b(
tiled_mma,
mma_tiler_mnk,
b_dtype,
1, # a tmp 1 stage is provided
)
sfa_smem_layout_staged_one = blockscaled_utils.make_smem_layout_sfa(
tiled_mma,
mma_tiler_mnk,
sf_vec_size,
1, # a tmp 1 stage is provided
)
sfb_smem_layout_staged_one = blockscaled_utils.make_smem_layout_sfb(
tiled_mma,
mma_tiler_mnk,
sf_vec_size,
1, # a tmp 1 stage is provided
)
c_smem_layout_staged_one = sm100_utils.make_smem_layout_epi(
c_dtype,
c_layout,
epi_tile,
1,
)
ab_bytes_per_stage = (
cute.size_in_bytes(a_dtype, a_smem_layout_stage_one)
+ cute.size_in_bytes(b_dtype, b_smem_layout_staged_one)
+ cute.size_in_bytes(sf_dtype, sfa_smem_layout_staged_one)
+ cute.size_in_bytes(sf_dtype, sfb_smem_layout_staged_one)
)
mbar_helpers_bytes = 1024
c_bytes_per_stage = cute.size_in_bytes(c_dtype, c_smem_layout_staged_one)
c_bytes = c_bytes_per_stage * num_c_stage
# Calculate A/B/SFA/SFB stages:
# Start with total smem per CTA (capacity / occupancy)
# Subtract reserved bytes and initial C stages bytes
# Divide remaining by bytes needed per A/B/SFA/SFB stage
num_ab_stage = (
smem_capacity // occupancy - (mbar_helpers_bytes + c_bytes)
) // ab_bytes_per_stage
# Refine epilogue stages:
# Calculate remaining smem after allocating for A/B/SFA/SFB stages and reserved bytes
# Add remaining unused smem to epilogue
num_c_stage += (
smem_capacity
- occupancy * ab_bytes_per_stage * num_ab_stage
- occupancy * (mbar_helpers_bytes + c_bytes)
) // (occupancy * c_bytes_per_stage)
return num_acc_stage, num_ab_stage, num_c_stage
@staticmethod
def _compute_grid(
total_num_clusters: int, cluster_shape_mn: tuple[int, int],
max_active_clusters: cutlass.Constexpr[int],
) -> tuple[utils.PersistentTileSchedulerParams, tuple[int, int, int]]:
problem_shape_ntile_mnl = (
cluster_shape_mn[0], cluster_shape_mn[1], cutlass.Int32(total_num_clusters),
)
tile_sched_params = utils.PersistentTileSchedulerParams(
problem_shape_ntile_mnl, (*cluster_shape_mn, 1)
)
grid = utils.StaticPersistentTileScheduler.get_grid_shape(
tile_sched_params, max_active_clusters
)
return tile_sched_params, grid
@staticmethod
def _get_mbar_smem_bytes(**kwargs_stages: int) -> int:
num_barriers_per_stage = 2
num_bytes_per_barrier = 8
return sum([num_barriers_per_stage * num_bytes_per_barrier * stage for stage in kwargs_stages.values()])
@staticmethod
def is_valid_dtypes_and_scale_factor_vec_size(
ab_dtype: Type[cutlass.Numeric], sf_dtype: Type[cutlass.Numeric],
sf_vec_size: int, c_dtype: Type[cutlass.Numeric],
) -> bool:
is_valid = True
if ab_dtype not in {cutlass.Float4E2M1FN, cutlass.Float8E5M2, cutlass.Float8E4M3FN}:
is_valid = False
if sf_vec_size not in {16, 32}:
is_valid = False
if sf_dtype not in {cutlass.Float8E8M0FNU, cutlass.Float8E4M3FN}:
is_valid = False
# Check valid sf_dtype and sf_vec_size combinations
if sf_dtype == cutlass.Float8E4M3FN and sf_vec_size == 32:
is_valid = False
if ab_dtype in {cutlass.Float8E5M2, cutlass.Float8E4M3FN} and sf_vec_size == 16:
is_valid = False
# Check valid c_dtype
if c_dtype not in {
cutlass.Float32,
cutlass.Float16,
cutlass.BFloat16,
cutlass.Float8E5M2,
cutlass.Float8E4M3FN,
}:
is_valid = False
return is_valid
@staticmethod
def is_valid_layouts(ab_dtype: Type[cutlass.Numeric], c_dtype: Type[cutlass.Numeric],
a_major: str, b_major: str, c_major: str) -> bool:
if ab_dtype is cutlass.Float4E2M1FN and not (a_major == "k" and b_major == "k"):
return False
return True
@staticmethod
def is_valid_mma_tiler_and_cluster_shape(
mma_tiler_mn: Tuple[int, int], cluster_shape_mn: Tuple[int, int],
) -> bool:
is_valid = True
# Skip invalid mma tile shape
if mma_tiler_mn[0] not in [128, 256]:
is_valid = False
if mma_tiler_mn[1] not in [128, 256]:
is_valid = False
# Skip illegal cluster shape
if cluster_shape_mn[0] % (2 if mma_tiler_mn[0] == 256 else 1) != 0:
is_valid = False
# Skip invalid cluster shape
is_power_of_2 = lambda x: x > 0 and (x & (x - 1)) == 0
if (
cluster_shape_mn[0] * cluster_shape_mn[1] > 16
or cluster_shape_mn[0] <= 0
or cluster_shape_mn[1] <= 0
# Special cluster shape check for scale factor multicasts.
# Due to limited size of scale factors, we can't multicast among more than 4 CTAs.
or cluster_shape_mn[0] > 4
or cluster_shape_mn[1] > 4
or not is_power_of_2(cluster_shape_mn[0])
or not is_power_of_2(cluster_shape_mn[1])
):
is_valid = False
return is_valid
@staticmethod
def is_valid_tensor_alignment(
problem_sizes_mnkl: List[Tuple[int, int, int, int]],
ab_dtype: Type[cutlass.Numeric], c_dtype: Type[cutlass.Numeric],
a_major: str, b_major: str, c_major: str,
) -> bool:
def check_contigous_16B_alignment(dtype, is_mode0_major, tensor_shape):
major_mode_idx = 0 if is_mode0_major else 1
num_contiguous_elements = 16 * 8 // dtype.width
return tensor_shape[major_mode_idx] % num_contiguous_elements == 0
for m, n, k, l in problem_sizes_mnkl:
if (not check_contigous_16B_alignment(ab_dtype, a_major == "m", (m, k, l))
or not check_contigous_16B_alignment(ab_dtype, b_major == "n", (n, k, l))
or not check_contigous_16B_alignment(c_dtype, c_major == "m", (m, n, l))):
return False
return True
@staticmethod
def can_implement(
ab_dtype: Type[cutlass.Numeric], sf_dtype: Type[cutlass.Numeric], sf_vec_size: int,
c_dtype: Type[cutlass.Numeric], mma_tiler_mn: Tuple[int, int],
cluster_shape_mn: Tuple[int, int], problem_sizes_mnkl: List[Tuple[int, int, int, int]],
a_major: str, b_major: str, c_major: str,
) -> bool:
K = Sm100GroupedBlockScaledGemmKernel
if not K.is_valid_dtypes_and_scale_factor_vec_size(ab_dtype, sf_dtype, sf_vec_size, c_dtype):
return False
if not K.is_valid_layouts(ab_dtype, c_dtype, a_major, b_major, c_major):
return False
if not K.is_valid_mma_tiler_and_cluster_shape(mma_tiler_mn, cluster_shape_mn):
return False
if not K.is_valid_tensor_alignment(problem_sizes_mnkl, ab_dtype, c_dtype, a_major, b_major, c_major):
return False
return True
reserved_smem_bytes = 1024
bytes_per_tensormap = 128
num_tensormaps = 5
tensor_memory_management_bytes = 12
def create_tensor_and_stride(
l: int, mode0: int, mode1: int, is_mode0_major: bool,
dtype: type[cutlass.Numeric], is_dynamic_layout: bool = True,
) -> tuple[int, torch.Tensor, cute.Tensor, torch.Tensor, tuple[int, int]]:
torch_tensor_cpu = cutlass_torch.matrix(l, mode0, mode1, is_mode0_major, cutlass.Float32)
cute_tensor, torch_tensor = cutlass_torch.cute_tensor_like(torch_tensor_cpu, dtype, is_dynamic_layout, assumed_align=16)
stride = (1, mode0) if is_mode0_major else (mode1, 1)
return (torch_tensor.data_ptr(), torch_tensor, cute_tensor, torch_tensor_cpu, stride)
def create_tensors_abc_for_all_groups(
problem_sizes_mnkl: List[tuple[int, int, int, int]],
ab_dtype: Type[cutlass.Numeric], c_dtype: Type[cutlass.Numeric],
a_major: str, b_major: str, c_major: str,
):
ref_torch_fp32_tensors_abc, torch_tensors_abc, cute_tensors_abc, strides_abc, ptrs_abc = [], [], [], [], []
for group_idx, (m, n, k, l) in enumerate(problem_sizes_mnkl):
# Create tensors A, B, C
(
ptr_a,
torch_tensor_a,
cute_tensor_a,
ref_torch_fp32_tensor_a,
stride_mk_a,
) = create_tensor_and_stride(l, m, k, a_major == "m", ab_dtype)
(
ptr_b,
torch_tensor_b,
cute_tensor_b,
ref_torch_fp32_tensor_b,
stride_nk_b,
) = create_tensor_and_stride(l, n, k, b_major == "n", ab_dtype)
(
ptr_c,
torch_tensor_c,
cute_tensor_c,
ref_torch_fp32_tensor_c,
stride_mn_c,
) = create_tensor_and_stride(l, m, n, c_major == "m", c_dtype)
ref_torch_fp32_tensors_abc.append(
[ref_torch_fp32_tensor_a, ref_torch_fp32_tensor_b, ref_torch_fp32_tensor_c]
)
ptrs_abc.append([ptr_a, ptr_b, ptr_c])
torch_tensors_abc.append([torch_tensor_a, torch_tensor_b, torch_tensor_c])
strides_abc.append([stride_mk_a, stride_nk_b, stride_mn_c])
cute_tensors_abc.append(
(
cute_tensor_a,
cute_tensor_b,
cute_tensor_c,
)
)
return (
ptrs_abc,
torch_tensors_abc,
cute_tensors_abc,
strides_abc,
ref_torch_fp32_tensors_abc,
)
@cute.jit
def cvt_sf_MKL_to_M32x4xrm_K4xrk_L(
sf_ref_tensor: cute.Tensor,
sf_mma_tensor: cute.Tensor,
):
"""Convert scale factor tensor from MKL layout to mma specification M(32x4xrest_m)xK(4xrest_k)xL layout"""
# sf_mma_tensor has flatten shape (32, 4, rest_m, 4, rest_k, l)
# group to ((32, 4, rest_m), (4, rest_k), l)
sf_mma_tensor = cute.group_modes(sf_mma_tensor, 0, 3)
sf_mma_tensor = cute.group_modes(sf_mma_tensor, 1, 3)
for i in cutlass.range(cute.size(sf_ref_tensor)):
mkl_coord = sf_ref_tensor.layout.get_hier_coord(i)
sf_mma_tensor[mkl_coord] = sf_ref_tensor[mkl_coord]
# Create scale factor tensor SFA/SFB
def create_scale_factor_tensor(l, mn, k, sf_vec_size, dtype):
def ceil_div(a, b):
return (a + b - 1) // b
sf_k = max(1, ceil_div(k, sf_vec_size))
ref_shape = (l, mn, sf_k)
atom_m = (32, 4)
atom_k = 4
mma_shape = (
l,
ceil_div(mn, atom_m[0] * atom_m[1]),
ceil_div(sf_k, atom_k),
atom_m[0],
atom_m[1],
atom_k,
)
ref_permute_order = (1, 2, 0)
mma_permute_order = (3, 4, 1, 5, 2, 0)
# Create f32 ref torch tensor (cpu)
ref_f32_torch_tensor_cpu = cutlass_torch.create_and_permute_torch_tensor(
ref_shape,
torch.float32,
permute_order=ref_permute_order,
init_type=cutlass_torch.TensorInitType.RANDOM,
init_config=cutlass_torch.RandomInitConfig(
min_val=1,
max_val=3,
),
)
# Create f32 cute torch tensor (cpu)
cute_f32_torch_tensor_cpu = cutlass_torch.create_and_permute_torch_tensor(
mma_shape,
torch.float32,
permute_order=mma_permute_order,
init_type=cutlass_torch.TensorInitType.RANDOM,
init_config=cutlass_torch.RandomInitConfig(
min_val=0,
max_val=1,
),
)
# convert ref f32 tensor to cute f32 tensor
cvt_sf_MKL_to_M32x4xrm_K4xrk_L(
from_dlpack(ref_f32_torch_tensor_cpu),
from_dlpack(cute_f32_torch_tensor_cpu),
)
cute_f32_torch_tensor = cute_f32_torch_tensor_cpu.cuda()
# reshape makes memory contiguous
ref_f32_torch_tensor_cpu = (
ref_f32_torch_tensor_cpu.permute(2, 0, 1)
.unsqueeze(-1)
.expand(l, mn, sf_k, sf_vec_size)
.reshape(l, mn, sf_k * sf_vec_size)
.permute(*ref_permute_order)
)
# prune to mkl for reference check.
ref_f32_torch_tensor_cpu = ref_f32_torch_tensor_cpu[:, :k, :]
# Create dtype cute torch tensor (cpu)
cute_tensor, cute_torch_tensor = cutlass_torch.cute_tensor_like(
cute_f32_torch_tensor_cpu,
dtype,
is_dynamic_layout=True,
assumed_align=16,
)
# Convert f32 cute tensor to dtype cute tensor
cute_tensor = cutlass_torch.convert_cute_tensor(
cute_f32_torch_tensor,
cute_tensor,
dtype,
is_dynamic_layout=True,
)
# get pointer of the tensor
ptr = cute_torch_tensor.data_ptr()
return ref_f32_torch_tensor_cpu, ptr, cute_tensor, cute_torch_tensor
def create_tensors_sfasfb_for_all_groups(
problem_sizes_mnkl: List[tuple[int, int, int, int]],
sf_dtype: Type[cutlass.Numeric],
sf_vec_size: int,
) -> tuple[
List[List[int]],
List[List[torch.Tensor]],
List[tuple],
List[List[torch.Tensor]],
]:
ptrs_sfasfb = []
torch_tensors_sfasfb = []
cute_tensors_sfasfb = []
refs_sfasfb = []
# Iterate through all groups and create tensors for each group
for group_idx, (m, n, k, l) in enumerate(problem_sizes_mnkl):
sfa_ref, ptr_sfa, sfa_tensor, sfa_torch = create_scale_factor_tensor(
l, m, k, sf_vec_size, sf_dtype
)
sfb_ref, ptr_sfb, sfb_tensor, sfb_torch = create_scale_factor_tensor(
l, n, k, sf_vec_size, sf_dtype
)
ptrs_sfasfb.append([ptr_sfa, ptr_sfb])
torch_tensors_sfasfb.append([sfa_torch, sfb_torch])
cute_tensors_sfasfb.append(
(
sfa_tensor,
sfb_tensor,
)
)
refs_sfasfb.append([sfa_ref, sfb_ref])
return (
ptrs_sfasfb,
torch_tensors_sfasfb,
cute_tensors_sfasfb,
refs_sfasfb,
)
def run(
num_groups: int,
problem_sizes_mnkl: List[Tuple[int, int, int, int]],
host_problem_shape_available: bool,
ab_dtype: Type[cutlass.Numeric],
sf_dtype: Type[cutlass.Numeric],
sf_vec_size: int,
c_dtype: Type[cutlass.Numeric],
a_major: str,
b_major: str,
c_major: str,
mma_tiler_mn: Tuple[int, int],
cluster_shape_mn: Tuple[int, int],
tolerance: float = 1e-01,
warmup_iterations: int = 0,
iterations: int = 1,
skip_ref_check: bool = False,
**kwargs,
):
"""Run SM100 grouped blockscaledGEMM example with specified configurations.
:return: Execution time of the GEMM kernel in microseconds
:rtype: float
"""
print("Running Blackwell Grouped GEMM test with:")
print(f"{num_groups} groups")
for i, (m, n, k, l) in enumerate(problem_sizes_mnkl):
print(f"Group {i}: {m}x{n}x{k}x{l}")
print(f"AB dtype: {ab_dtype}, SF dtype: {sf_dtype}, SF Vec size: {sf_vec_size}")
print(f"C dtype: {c_dtype}")
print(f"Matrix majors - A: {a_major}, B: {b_major}, C: {c_major}")
print(f"Mma Tiler (M, N): {mma_tiler_mn}, Cluster Shape (M, N): {cluster_shape_mn}")
print(f"Tolerance: {tolerance}")
print(f"Warmup iterations: {warmup_iterations}")
print(f"Iterations: {iterations}")
print(f"Skip reference checking: {skip_ref_check}")
# Skip unsupported testcase
if not Sm100GroupedBlockScaledGemmKernel.can_implement(
ab_dtype,
sf_dtype,
sf_vec_size,
c_dtype,
mma_tiler_mn,
cluster_shape_mn,
problem_sizes_mnkl,
a_major,
b_major,
c_major,
):
raise TypeError(
f"Unsupported testcase {ab_dtype}, {sf_dtype}, {sf_vec_size}, {c_dtype}, {mma_tiler_mn}, {cluster_shape_mn}, {problem_sizes_mnkl}, {a_major}, {b_major}, {c_major}"
)
if not torch.cuda.is_available():
raise RuntimeError("GPU is required to run this example!")
torch.manual_seed(2025)
# Create tensors A, B, C for all groups
(
ptrs_abc,
torch_tensors_abc,
cute_tensors_abc,
strides_abc,
ref_f32_torch_tensors_abc,
) = create_tensors_abc_for_all_groups(
problem_sizes_mnkl,
ab_dtype,
c_dtype,
a_major,
b_major,
c_major,
)
# Create tensors SFA, SFB for all groups
(
ptrs_sfasfb,
torch_tensors_sfasfb,
cute_tensors_sfasfb,
refs_f32_torch_tensors_sfasfb,
) = create_tensors_sfasfb_for_all_groups(
problem_sizes_mnkl,
sf_dtype,
sf_vec_size,
)
# Setup inital tensors for TMA of A,B and C
alignment = 16 # 16 bytes aligned
divisibility_ab = 32 if ab_dtype == cutlass.Float4E2M1FN else 16
divisibility_c = 32 if c_dtype == cutlass.Float4E2M1FN else 16
divisibility_sf = 32 if sf_dtype == cutlass.Float4E2M1FN else 16
min_ab_size = alignment * 8 // ab_dtype.width # alignment bytes of width
div_mul_ab = (divisibility_ab + min_ab_size - 1) // min_ab_size
min_ab_size = min_ab_size * div_mul_ab
min_c_size = alignment * 8 // c_dtype.width
div_mul_c = (divisibility_c + min_c_size - 1) // min_c_size
min_c_size = min_c_size * div_mul_c
min_sf_size = alignment * 8 // sf_dtype.width
div_mul_sf = (divisibility_sf + min_sf_size - 1) // min_sf_size
min_sf_size = min_sf_size * div_mul_sf
initial_cute_tensors_abc = [
create_tensor_and_stride(1, min_ab_size, min_ab_size, a_major == "m", ab_dtype)[
2
],
create_tensor_and_stride(1, min_ab_size, min_ab_size, b_major == "n", ab_dtype)[
2
],
create_tensor_and_stride(1, min_c_size, min_c_size, c_major == "m", c_dtype)[2],
]
initial_cute_tensors_sfasfb = [
create_tensor_and_stride(1, min_sf_size, min_sf_size, a_major == "m", sf_dtype)[
2
],
create_tensor_and_stride(1, min_sf_size, min_sf_size, b_major == "n", sf_dtype)[
2
],
]
hardware_info = cutlass.utils.HardwareInfo()
sm_count = hardware_info.get_max_active_clusters(1)
max_active_clusters = hardware_info.get_max_active_clusters(
cluster_shape_mn[0] * cluster_shape_mn[1]
)
# Prepare tensormap buffer for each SM
num_tensormap_buffers = sm_count
tensormap_shape = (
num_tensormap_buffers,
Sm100GroupedBlockScaledGemmKernel.num_tensormaps,
Sm100GroupedBlockScaledGemmKernel.bytes_per_tensormap // 8,
)
tensor_of_tensormap, tensor_of_tensormap_torch = cutlass_torch.cute_tensor_like(
torch.empty(tensormap_shape, dtype=torch.int64),
cutlass.Int64,
is_dynamic_layout=False,
)
grouped_blockscaled_gemm = Sm100GroupedBlockScaledGemmKernel(
sf_vec_size,
mma_tiler_mn,
cluster_shape_mn,
)
# layout (num_groups, 4):(4, 1)
(
tensor_of_dim_size_mnkl,
tensor_of_dim_size_mnkl_torch,
) = cutlass_torch.cute_tensor_like(
torch.tensor(problem_sizes_mnkl, dtype=torch.int32),
cutlass.Int32,
is_dynamic_layout=False,
assumed_align=16,
)
# layout (num_groups, 3, 2):(6, 2, 1)
tensor_of_strides_abc, tensor_of_strides_abc_torch = cutlass_torch.cute_tensor_like(
torch.tensor(strides_abc, dtype=torch.int32),
cutlass.Int32,
is_dynamic_layout=False,
assumed_align=16,
)
# layout (num_groups,3):(3, 1)
tensor_of_ptrs_abc, tensor_of_ptrs_abc_torch = cutlass_torch.cute_tensor_like(
torch.tensor(ptrs_abc, dtype=torch.int64),
cutlass.Int64,
is_dynamic_layout=False,
assumed_align=16,
)
# layout (num_groups,2):(2, 1)
tensor_of_ptrs_sfasfb, tensor_of_ptrs_sfasfb_torch = cutlass_torch.cute_tensor_like(
torch.tensor(ptrs_sfasfb, dtype=torch.int64),
cutlass.Int64,
is_dynamic_layout=False,
assumed_align=16,
)
# Compute total number of cluster tiles we need to compute for given grouped GEMM problem
def compute_total_num_clusters(
problem_sizes_mnkl: List[tuple[int, int, int, int]],
cluster_tile_shape_mn: tuple[int, int],
) -> int:
total_num_clusters = 0
for m, n, _, _ in problem_sizes_mnkl:
num_clusters_mn = tuple(
(x + y - 1) // y for x, y in zip((m, n), cluster_tile_shape_mn)
)
total_num_clusters += functools.reduce(lambda x, y: x * y, num_clusters_mn)
return total_num_clusters
# Compute cluster tile shape
def compute_cluster_tile_shape(
mma_tiler_mn: tuple[int, int],
cluster_shape_mn: tuple[int, int],
) -> tuple[int, int]:
cta_tile_shape_mn = [128, mma_tiler_mn[1]]
return tuple(x * y for x, y in zip(cta_tile_shape_mn, cluster_shape_mn))
cluster_tile_shape_mn = compute_cluster_tile_shape(mma_tiler_mn, cluster_shape_mn)
total_num_clusters = compute_total_num_clusters(
problem_sizes_mnkl, cluster_tile_shape_mn
)
# If the host problem shape is available, we will launch the grid with only
# the necessary clusters. The function compute_total_num_clusters() does that.
# If the problem shape only exists on device, we will need to launch all active
# clusters possible on a device.
if host_problem_shape_available:
print("Problem shapes available on host and device")
total_num_clusters = compute_total_num_clusters(
problem_sizes_mnkl, cluster_tile_shape_mn
)
else:
print("Problem shapes available only on device")
total_num_clusters = max_active_clusters
# Compile grouped GEMM kernel
compiled_grouped_gemm = cute.compile(
grouped_blockscaled_gemm,
initial_cute_tensors_abc[0],
initial_cute_tensors_abc[1],
initial_cute_tensors_abc[2],
initial_cute_tensors_sfasfb[0],
initial_cute_tensors_sfasfb[1],
num_groups,
tensor_of_dim_size_mnkl,
tensor_of_strides_abc,
tensor_of_ptrs_abc,
tensor_of_ptrs_sfasfb,
total_num_clusters,
tensor_of_tensormap,
max_active_clusters,
options=f"--opt-level 2",
)
# reference check
if not skip_ref_check:
compiled_grouped_gemm(
initial_cute_tensors_abc[0],
initial_cute_tensors_abc[1],
initial_cute_tensors_abc[2],
initial_cute_tensors_sfasfb[0],
initial_cute_tensors_sfasfb[1],
tensor_of_dim_size_mnkl,
tensor_of_strides_abc,
tensor_of_ptrs_abc,
tensor_of_ptrs_sfasfb,
tensor_of_tensormap,
)
print("Verifying results...")
for i, (
(a_ref, b_ref, c_ref),
(sfa_ref, sfb_ref),
(a_tensor, b_tensor, c_tensor),
(m, n, k, l),
) in enumerate(
zip(
ref_f32_torch_tensors_abc,
refs_f32_torch_tensors_sfasfb,
cute_tensors_abc,
problem_sizes_mnkl,
)
):
ref_res_a = torch.einsum("mkl,mkl->mkl", a_ref, sfa_ref)
ref_res_b = torch.einsum("nkl,nkl->nkl", b_ref, sfb_ref)
ref = torch.einsum("mkl,nkl->mnl", ref_res_a, ref_res_b)
print(f"checking group {i}")
c_ref_device = c_ref.cuda()
cute.testing.convert(
c_tensor,
from_dlpack(c_ref_device, assumed_align=16).mark_layout_dynamic(
leading_dim=(1 if c_major == "n" else 0)
),
)
c_ref = c_ref_device.cpu()
if c_dtype in (cutlass.Float32, cutlass.Float16, cutlass.BFloat16):
torch.testing.assert_close(c_ref, ref, atol=tolerance, rtol=1e-02)
elif c_dtype in (cutlass.Float8E5M2, cutlass.Float8E4M3FN):
# Convert ref : f32 -> f8 -> f32
ref_f8_ = torch.empty(
*(l, m, n), dtype=torch.uint8, device="cuda"
).permute(1, 2, 0)
ref_f8 = from_dlpack(ref_f8_, assumed_align=16).mark_layout_dynamic(
leading_dim=1
)
ref_f8.element_type = c_dtype
ref_device = ref.permute(2, 0, 1).contiguous().permute(1, 2, 0).cuda()
ref_tensor = from_dlpack(
ref_device, assumed_align=16
).mark_layout_dynamic(leading_dim=1)
cute.testing.convert(ref_tensor, ref_f8)
cute.testing.convert(ref_f8, ref_tensor)
ref = ref_device.cpu()
torch.testing.assert_close(c_ref, ref, atol=tolerance, rtol=1e-02)
# Warmup iterations
for _ in range(warmup_iterations):
compiled_grouped_gemm(
initial_cute_tensors_abc[0],
initial_cute_tensors_abc[1],
initial_cute_tensors_abc[2],
initial_cute_tensors_sfasfb[0],
initial_cute_tensors_sfasfb[1],
tensor_of_dim_size_mnkl,
tensor_of_strides_abc,
tensor_of_ptrs_abc,
tensor_of_ptrs_sfasfb,
tensor_of_tensormap,
)
torch.cuda.synchronize()
# Benchmark iterations with CUDA events for timing
start_event = torch.cuda.Event(enable_timing=True)
end_event = torch.cuda.Event(enable_timing=True)
start_event.record()
for _ in range(iterations):
compiled_grouped_gemm(
initial_cute_tensors_abc[0],
initial_cute_tensors_abc[1],
initial_cute_tensors_abc[2],
initial_cute_tensors_sfasfb[0],
initial_cute_tensors_sfasfb[1],
tensor_of_dim_size_mnkl,
tensor_of_strides_abc,
tensor_of_ptrs_abc,
tensor_of_ptrs_sfasfb,
tensor_of_tensormap,
)
end_event.record()
torch.cuda.synchronize()
elapsed_ms = start_event.elapsed_time(end_event)
exec_time = (elapsed_ms * 1000) / iterations # Average time in microseconds
runtime_s = exec_time / 1.0e6
fmas = 0
for group in range(num_groups):
[M, N, K, _] = problem_sizes_mnkl[group]
fmas += M * N * K
flop = 2 * fmas
gflop = flop / 1.0e9
gflops = gflop / runtime_s
print("Average Runtime : ", exec_time / 1000, "ms")
print("GFLOPS : ", gflops)
return exec_time
# Auto-testing entry point
try:
from task import input_t, output_t
except ImportError:
input_t = Tuple[List[Tuple[torch.Tensor, torch.Tensor, torch.Tensor]], List[Tuple[torch.Tensor, torch.Tensor]], List[Tuple[torch.Tensor, torch.Tensor]], List[Tuple[int, int, int, int]]]
output_t = List[torch.Tensor]
_base, _cache, _ptr_cache, _last_call = None, {}, {}, None
_fused_cache = {} # Cache for fused GEMM when all groups have same N and K
def _can_fuse_groups(ps):
"""Check if all groups have same N and K."""
if len(ps) < 1:
return False
n0, k0 = ps[0][1], ps[0][2]
return all(p[1] == n0 and p[2] == k0 for p in ps)
def _create_fused_sf(sf_orig_list, m_values, k_val, l_val=1):
"""Create properly reordered scale factor for fused M dimension.
Args:
sf_orig_list: List of original (non-reordered) scale factor tensors [M_i, K//16, L]
m_values: List of M values for each group
k_val: Common K dimension
l_val: Batch size (usually 1)
Returns:
Reordered scale factor tensor for fused M dimension
"""
sf_vec_size = 16
total_m = sum(m_values)
sf_k = (k_val + sf_vec_size - 1) // sf_vec_size
atom_m = (32, 4)
atom_k = 4
# Move all SF tensors to GPU if needed and concatenate
sf_gpu_list = []
for sf in sf_orig_list:
if sf.device.type == 'cpu':
sf_gpu_list.append(sf.cuda())
else:
sf_gpu_list.append(sf)
# Concatenate original SFA tensors along M dimension
# Each sf_orig[i] has shape [M_i, K//16, L]
sfa_cat = torch.cat(sf_gpu_list, dim=0) # [total_M, K//16, L]
# Create output reordered tensor
rest_m = (total_m + 127) // 128
rest_k = (sf_k + atom_k - 1) // atom_k
# Output shape: (32, 4, rest_m, 4, rest_k, l)
reordered = torch.zeros(32, 4, rest_m, atom_k, rest_k, l_val,
dtype=sfa_cat.dtype, device='cuda')
# Vectorized reordering
i_idx = torch.arange(total_m, device='cuda')
j_idx = torch.arange(sf_k, device='cuda')
b_idx = torch.arange(l_val, device='cuda')
i_grid, j_grid, b_grid = torch.meshgrid(i_idx, j_idx, b_idx, indexing='ij')
mm = i_grid // 128
mm32 = i_grid % atom_m[0]
mm4 = (i_grid % 128) // atom_m[0]
kk = j_grid // atom_k
kk4 = j_grid % atom_k
reordered[mm32, mm4, mm, kk4, kk, b_grid] = sfa_cat[i_grid, j_grid, b_grid]
return reordered
def custom_kernel(data: input_t) -> output_t:
"""Highly optimized custom_kernel with workload-adaptive configuration.
Key optimizations:
- Adaptive tile selection based on N/K dimensions
- Optimized cluster shapes for better parallelism
- Aggressive caching of compiled kernels
"""
global _base, _cache, _ptr_cache, _last_call
at, sf_orig, sr, ps = data
ng = len(ps)
# ULTRA-fast path: same data object as last call
if _last_call is not None and _last_call[0] is data:
_last_call[1]()
return _last_call[2]
# Check if we've seen these exact tensors before (by data_ptr)
a0_ptr = at[0][0].data_ptr()
if ng in _ptr_cache:
ng_cache = _ptr_cache[ng]
if a0_ptr in ng_cache:
entry = ng_cache[a0_ptr]
if entry[0] == tuple(at[i][j].data_ptr() for i in range(ng) for j in range(3)):
fn, outs = entry[1], entry[2]
_last_call = (data, fn, outs)
fn()
return outs
# Initialize base resources if needed
if _base is None:
ab = cutlass.Float4E2M1FN
sf = cutlass.Float8E4M3FN
c = cutlass.Float16
abc = [
create_tensor_and_stride(1, 64, 64, False, ab)[2],
create_tensor_and_stride(1, 64, 64, False, ab)[2],
create_tensor_and_stride(1, 16, 16, False, c)[2],
]
sft = [
create_tensor_and_stride(1, 16, 16, False, sf)[2],
create_tensor_and_stride(1, 16, 16, False, sf)[2],
]
hw = cutlass.utils.HardwareInfo()
sm = hw.get_max_active_clusters(1)
tm = torch.zeros((sm * 4, 5, 16), dtype=torch.int64, device="cuda")
tmap, _ = cutlass_torch.cute_tensor_like(tm, cutlass.Int64, is_dynamic_layout=False)
max_clus = hw.get_max_active_clusters(2)
max_clus4 = hw.get_max_active_clusters(4)
_base = {"abc": abc, "sf": sft, "tmap": tmap, "max": sm, "max_clus2": max_clus, "max_clus4": max_clus4}
b = _base
outs = [at[i][2] for i in range(ng)]
# FUSED PATH DISABLED - has scale factor layout issues
# Always use grouped GEMM for correctness
# NON-FUSED PATH: Grouped GEMM
# Analyze workload characteristics for optimal config
total_m = sum(p[0] for p in ps)
n_val = ps[0][1]
k_val = ps[0][2]
# Select tile configuration based on problem shape
# B200 has 148 SMs, large SMEM capacity
# NCU showed: 227KB SMEM limits to 1 block/SM,
# Long scoreboard stalls (11.95) indicate memory latency bound
# 128x128 tiles work best for most cases
# 128x256 only helps for large N with smaller K
if n_val >= 6000 and k_val <= 3000:
tile_m, tile_n = 128, 256
else:
tile_m, tile_n = 128, 128
cluster_m, cluster_n = 1, 1
# Compute cluster tiles
cluster_tile_m = tile_m * cluster_m
cluster_tile_n = tile_n * cluster_n
tc = sum(((m + cluster_tile_m - 1) // cluster_tile_m) *
((n + cluster_tile_n - 1) // cluster_tile_n) for m, n, _, _ in ps)
key = (ng, tc, tuple(ps), tile_m, tile_n, cluster_m, cluster_n)
if key not in _cache:
# Extract pointers
ap = [[at[i][0].data_ptr(), at[i][1].data_ptr(), at[i][2].data_ptr()] for i in range(ng)]
sp = [[sr[i][0].data_ptr(), sr[i][1].data_ptr()] for i in range(ng)]
st = [[[ps[i][2], 1], [ps[i][2], 1], [ps[i][1], 1]] for i in range(ng)]
d = torch.tensor(ps, dtype=torch.int32, device="cuda")
s = torch.tensor(st, dtype=torch.int32, device="cuda")
pa = torch.tensor(ap, dtype=torch.int64, device="cuda")
pf = torch.tensor(sp, dtype=torch.int64, device="cuda")
td, _ = cutlass_torch.cute_tensor_like(d, cutlass.Int32, is_dynamic_layout=False, assumed_align=16)
ts, ts_torch = cutlass_torch.cute_tensor_like(s, cutlass.Int32, is_dynamic_layout=False, assumed_align=16)
ta, ta_torch = cutlass_torch.cute_tensor_like(pa, cutlass.Int64, is_dynamic_layout=False, assumed_align=16)
tf, tf_torch = cutlass_torch.cute_tensor_like(pf, cutlass.Int64, is_dynamic_layout=False, assumed_align=16)
# Get max active clusters for selected cluster size
cluster_size = cluster_m * cluster_n
max_act = b["max"] if cluster_size == 1 else (b["max_clus2"] if cluster_size == 2 else b["max_clus4"])
# Create grouped kernel with occupancy=1 (more SMEM for pipeline stages)
g = Sm100GroupedBlockScaledGemmKernel(16, (tile_m, tile_n), (cluster_m, cluster_n), occupancy=1)
k = cute.compile(g, b["abc"][0], b["abc"][1], b["abc"][2], b["sf"][0], b["sf"][1],
ng, td, ts, ta, tf, tc, b["tmap"], max_act, options="--opt-level 3")
_cache[key] = {"k": k, "td": td, "ts": ts, "ta": ta, "tf": tf,
"ta_torch": ta_torch, "tf_torch": tf_torch, "ts_torch": ts_torch,
"last_ptrs": None}
r = _cache[key]
# Update tensors if pointers changed
curr_ptrs = tuple((at[i][0].data_ptr(), at[i][1].data_ptr(), at[i][2].data_ptr(),
sr[i][0].data_ptr(), sr[i][1].data_ptr()) for i in range(ng))
if r.get("last_ptrs") != curr_ptrs:
ap = [[at[i][0].data_ptr(), at[i][1].data_ptr(), at[i][2].data_ptr()] for i in range(ng)]
sp = [[sr[i][0].data_ptr(), sr[i][1].data_ptr()] for i in range(ng)]
st = [[[ps[i][2], 1], [ps[i][2], 1], [ps[i][1], 1]] for i in range(ng)]
r["ta_torch"].copy_(torch.tensor(ap, dtype=torch.int64, device="cuda"))
r["tf_torch"].copy_(torch.tensor(sp, dtype=torch.int64, device="cuda"))
r["ts_torch"].copy_(torch.tensor(st, dtype=torch.int32, device="cuda"))
r["last_ptrs"] = curr_ptrs
kernel = r["k"]
abc0, abc1, abc2 = b["abc"]
sf0, sf1 = b["sf"]
td, ts, ta, tf, tmap = r["td"], r["ts"], r["ta"], r["tf"], b["tmap"]
def call_kernel():
kernel(abc0, abc1, abc2, sf0, sf1, td, ts, ta, tf, tmap)
full_key = tuple(at[i][j].data_ptr() for i in range(ng) for j in range(3))
if ng not in _ptr_cache:
_ptr_cache[ng] = {}
_ptr_cache[ng][a0_ptr] = (full_key, call_kernel, outs)
_last_call = (data, call_kernel, outs)
call_kernel()
return outs
scrolls · 2760 lines total
Source code from GPU Mode and the KernelBot dataset · June 9 Researcher Reciprocity License v1.0
Changes from previous submission
Against this author's previous submission submission 409293.
⋯ diff truncated: revisions differ almost entirely
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