submission 99242
Petr_Rocoss · python · License unknown
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a100.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-conv2d-v2-99242?include=source"interfacepython
Compatibility
measured onNVIDIA L4
declared hardwareNVIDIA L4
architecturessm_89
dtypesfp32
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 digestsha256:94e3d23ad50d17b27dd988e319ec6f802b4c157ed664bfb36c5cc012e31d01f5
license declaredunknown
license concludedunknown
authorsPetr_Rocoss
imported2026-08-15
Techniques
Extracted from the mirrored source by pattern, never inferred. Each row cites its line.
autotune
@triton.autotune(num-warps = 8
triton.Config({'BLOCK_H': 16, 'BLOCK_W': 128}, num_warps=8, num_stages=5),stages = 5
triton.Config({'BLOCK_H': 16, 'BLOCK_W': 128}, num_warps=8, num_stages=5),Kernel source
a100.py169 lines
import torch
import triton
import triton.language as tl
@triton.autotune(
configs=[
# === A100 Ampere Optimized (80GB HBM2e) ===
# A100: 108 SM × 256 KB L2 cache, 40 MB shared across chip
# Оптимальные конфиги для максимального L2 reuse
# 1. Large Tile: Максимальный weight reuse в L2
triton.Config({'BLOCK_H': 16, 'BLOCK_W': 128}, num_warps=8, num_stages=5),
# 2. Wide Vectorization: Оптимально для coalesced access
triton.Config({'BLOCK_H': 8, 'BLOCK_W': 256}, num_warps=8, num_stages=5),
# 3. Balanced High-Throughput: Золотая середина
triton.Config({'BLOCK_H': 8, 'BLOCK_W': 128}, num_warps=8, num_stages=5),
# 4. Square-ish: Хорош для квадратных feature maps
triton.Config({'BLOCK_H': 16, 'BLOCK_W': 64}, num_warps=8, num_stages=4),
# 5. Memory Pressure Reduction: Меньший footprint
triton.Config({'BLOCK_H': 8, 'BLOCK_W': 64}, num_warps=4, num_stages=5),
# 6. High Parallelism: Малый тайл, больше блоков
triton.Config({'BLOCK_H': 4, 'BLOCK_W': 128}, num_warps=4, num_stages=4),
# 7. Extreme Width: Для очень широких outputs
triton.Config({'BLOCK_H': 4, 'BLOCK_W': 256}, num_warps=8, num_stages=4),
# 8. Fallback: Безопасная конфигурация
triton.Config({'BLOCK_H': 4, 'BLOCK_W': 64}, num_warps=4, num_stages=3),
],
key=['W_OUT', 'H_OUT', 'C_IN', 'K'],
)
@triton.jit
def conv2d_kernel_a100_ultimate(
input_ptr, weight_ptr, output_ptr,
stride_in_n, stride_in_c, stride_in_h, stride_in_w,
stride_w_out, stride_w_in, stride_w_h, stride_w_w,
stride_out_n, stride_out_c, stride_out_h, stride_out_w,
H_IN, W_IN, H_OUT, W_OUT, C_IN, C_OUT, K,
BLOCK_H: tl.constexpr, BLOCK_W: tl.constexpr
):
"""
A100-Optimized Conv2D Kernel - Maximum Performance Edition.
A100-Specific Optimizations:
1. num_stages=5: Оптимально для A100's pipeline depth (не 6-7 как H100)
2. Incremental pointers: Минимизация ALU operations
3. Register blocking: acc живет в регистрах (никогда не spills)
4. L2 cache awareness: Tile sizes подобраны для L2 reuse
5. Mask hoisting: Маски вычисляются один раз
"""
# === 1. Grid Decoding (Zero Overhead) ===
pid_w = tl.program_id(0)
pid_h = tl.program_id(1)
pid_z = tl.program_id(2)
batch_idx = pid_z // C_OUT
out_ch = pid_z % C_OUT
# === 2. Coordinate Generation ===
offs_h = pid_h * BLOCK_H + tl.arange(0, BLOCK_H)
offs_w = pid_w * BLOCK_W + tl.arange(0, BLOCK_W)
# === 3. Mask Hoisting (Computed Once) ===
mask_h = offs_h < H_OUT
mask_w = offs_w < W_OUT
mask_2d = mask_h[:, None] & mask_w[None, :]
# === 4. Base Pointer Setup ===
# КРИТИЧНО: Все arithmetic делается ОДИН РАЗ здесь
# Output pointers [BLOCK_H, BLOCK_W]
ptr_out = (output_ptr + batch_idx * stride_out_n + out_ch * stride_out_c +
offs_h[:, None] * stride_out_h + offs_w[None, :] * stride_out_w)
# Input base [BLOCK_H, BLOCK_W]
ptr_in_base = (input_ptr + batch_idx * stride_in_n +
offs_h[:, None] * stride_in_h + offs_w[None, :] * stride_in_w)
# Weight base (scalar)
ptr_wei_base = weight_ptr + out_ch * stride_w_out
# === 5. Accumulator (Register-Resident) ===
acc = tl.zeros([BLOCK_H, BLOCK_W], dtype=tl.float32)
# === 6. Triple-Nested Pointer Chasing ===
# ОПТИМИЗАЦИЯ: Три уровня указателей для устранения всех MUL из горячих циклов
ptr_in_ch = ptr_in_base
ptr_wei_ch = ptr_wei_base
for cin in range(C_IN):
# Level 2: Kernel Height
ptr_in_kh = ptr_in_ch
ptr_wei_kh = ptr_wei_ch
for kh in range(K):
# Level 3: Kernel Width (hottest loop)
ptr_in_kw = ptr_in_kh
ptr_wei_kw = ptr_wei_kh
for kw in range(K):
# === HOTTEST CODE PATH ===
# Только 2 loads + 1 FMA + 2 increments
# Load weight (scalar broadcast)
w = tl.load(ptr_wei_kw)
# Load input (vectorized 2D)
x = tl.load(ptr_in_kw, mask=mask_2d, other=0.0)
# FMA
acc += x * w
# Pointer increments (cheap ADD operations)
ptr_in_kw += stride_in_w
ptr_wei_kw += stride_w_w
# Level 2 increments
ptr_in_kh += stride_in_h
ptr_wei_kh += stride_w_h
# Level 1 increments
ptr_in_ch += stride_in_c
ptr_wei_ch += stride_w_in
# === 7. Store Result ===
tl.store(ptr_out, acc, mask=mask_2d)
def custom_kernel(data):
"""
Production wrapper for A100-optimized kernel.
"""
input_tensor, kernel, output_tensor = data
# Ensure contiguous memory layout (critical for A100 coalescing)
input_tensor = input_tensor.contiguous()
kernel = kernel.contiguous()
batch, c_in, h_in, w_in = input_tensor.shape
c_out, _, k_h, k_w = kernel.shape
h_out = h_in - k_h + 1
w_out = w_in - k_w + 1
grid = lambda META: (
triton.cdiv(w_out, META['BLOCK_W']),
triton.cdiv(h_out, META['BLOCK_H']),
batch * c_out
)
conv2d_kernel_a100_ultimate[grid](
input_tensor, kernel, output_tensor,
*input_tensor.stride(),
*kernel.stride(),
*output_tensor.stride(),
h_in, w_in, h_out, w_out,
c_in, c_out, k_h,
)
return output_tensor
scrolls · 169 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 99237.
⋯ 3 unchanged lines@triton.autotune(configs=[- # === A100 (Ampere) Specific Configs ===- # Ampere имеет меньше Shared Memory на SM, чем Hopper.- # num_stages > 5 часто снижают occupancy. Оптимум: 3-5.+ # === A100 Ampere Optimized (80GB HBM2e) ===+ # A100: 108 SM × 256 KB L2 cache, 40 MB shared across chip+ # Оптимальные конфиги для максимального L2 reuse- # 1. Balanced Reuse & Vectorization (Золотой стандарт A100)- triton.Config({'BLOCK_H': 16, 'BLOCK_W': 128}, num_warps=8, num_stages=4),- triton.Config({'BLOCK_H': 16, 'BLOCK_W': 64}, num_warps=8, num_stages=4),+ # 1. Large Tile: Максимальный weight reuse в L2+ triton.Config({'BLOCK_H': 16, 'BLOCK_W': 128}, num_warps=8, num_stages=5),- # 2. High Bandwidth (Широкие транзакции)- triton.Config({'BLOCK_H': 8, 'BLOCK_W': 256}, num_warps=8, num_stages=4),+ # 2. Wide Vectorization: Оптимально для coalesced access+ triton.Config({'BLOCK_H': 8, 'BLOCK_W': 256}, num_warps=8, num_stages=5),++ # 3. Balanced High-Throughput: Золотая серединаtriton.Config({'BLOCK_H': 8, 'BLOCK_W': 128}, num_warps=8, num_stages=5),-- # 3. High Compute Density (Меньше загрузок весов)- triton.Config({'BLOCK_H': 32, 'BLOCK_W': 64}, num_warps=8, num_stages=3),- # === Fallback / L4 / T4 ===- triton.Config({'BLOCK_H': 8, 'BLOCK_W': 64}, num_warps=4, num_stages=3),- triton.Config({'BLOCK_H': 4, 'BLOCK_W': 128}, num_warps=4, num_stages=3),+ # 4. Square-ish: Хорош для квадратных feature maps+ triton.Config({'BLOCK_H': 16, 'BLOCK_W': 64}, num_warps=8, num_stages=4),++ # 5. Memory Pressure Reduction: Меньший footprint+ triton.Config({'BLOCK_H': 8, 'BLOCK_W': 64}, num_warps=4, num_stages=5),++ # 6. High Parallelism: Малый тайл, больше блоков+ triton.Config({'BLOCK_H': 4, 'BLOCK_W': 128}, num_warps=4, num_stages=4),++ # 7. Extreme Width: Для очень широких outputs+ triton.Config({'BLOCK_H': 4, 'BLOCK_W': 256}, num_warps=8, num_stages=4),++ # 8. Fallback: Безопасная конфигурация+ triton.Config({'BLOCK_H': 4, 'BLOCK_W': 64}, num_warps=4, num_stages=3),],key=['W_OUT', 'H_OUT', 'C_IN', 'K'],)@triton.jit- def conv2d_kernel_a100_ultra(+ def conv2d_kernel_a100_ultimate(input_ptr, weight_ptr, output_ptr,stride_in_n, stride_in_c, stride_in_h, stride_in_w,stride_w_out, stride_w_in, stride_w_h, stride_w_w,⋯ 2 unchanged linesBLOCK_H: tl.constexpr, BLOCK_W: tl.constexpr):"""- Ultra-Optimized Conv2D for A100.- Focus: Pointer Chasing + High Weight Reuse + Optimal Stage count.+ A100-Optimized Conv2D Kernel - Maximum Performance Edition.++ A100-Specific Optimizations:+ 1. num_stages=5: Оптимально для A100's pipeline depth (не 6-7 как H100)+ 2. Incremental pointers: Минимизация ALU operations+ 3. Register blocking: acc живет в регистрах (никогда не spills)+ 4. L2 cache awareness: Tile sizes подобраны для L2 reuse+ 5. Mask hoisting: Маски вычисляются один раз"""- # --- 1. Grid Layout ---+ # === 1. Grid Decoding (Zero Overhead) ===pid_w = tl.program_id(0)pid_h = tl.program_id(1)pid_z = tl.program_id(2)⋯ 1 unchanged linesbatch_idx = pid_z // C_OUTout_ch = pid_z % C_OUT- # --- 2. Static Coordinate & Mask Gen ---- # Генерация смещений+ # === 2. Coordinate Generation ===offs_h = pid_h * BLOCK_H + tl.arange(0, BLOCK_H)offs_w = pid_w * BLOCK_W + tl.arange(0, BLOCK_W)- # Предварительный расчет масок.- # Вычисляем 1 раз и используем маскированное сохранение только в конце.- # Для загрузок используем маску, если нужно, но boundary check вынесен.+ # === 3. Mask Hoisting (Computed Once) ===mask_h = offs_h < H_OUTmask_w = offs_w < W_OUT- mask_block = mask_h[:, None] & mask_w[None, :]+ mask_2d = mask_h[:, None] & mask_w[None, :]- # --- 3. Smart Pointer Setup ---+ # === 4. Base Pointer Setup ===+ # КРИТИЧНО: Все arithmetic делается ОДИН РАЗ здесь- # Output Ptr [BLOCK_H, BLOCK_W]- # Используем broadcasting для создания 2D сетки адресов- # Base + Batch + Channel + Height offset + Width offset- ptr_out = output_ptr + \- batch_idx * stride_out_n + \- out_ch * stride_out_c + \- (offs_h[:, None] * stride_out_h) + \- (offs_w[None, :] * stride_out_w)-- # Input Ptr Base [BLOCK_H, BLOCK_W]- # Начало окна свертки для тайла- ptr_in_base = input_ptr + \- batch_idx * stride_in_n + \- (offs_h[:, None] * stride_in_h) + \- (offs_w[None, :] * stride_in_w)-- # Weight Ptr Base (Scalar)+ # Output pointers [BLOCK_H, BLOCK_W]+ ptr_out = (output_ptr + batch_idx * stride_out_n + out_ch * stride_out_c ++ offs_h[:, None] * stride_out_h + offs_w[None, :] * stride_out_w)++ # Input base [BLOCK_H, BLOCK_W]+ ptr_in_base = (input_ptr + batch_idx * stride_in_n ++ offs_h[:, None] * stride_in_h + offs_w[None, :] * stride_in_w)++ # Weight base (scalar)ptr_wei_base = weight_ptr + out_ch * stride_w_out- # Accumulator (Registers)- # fp32 accumulate is standard for A100 (TF32 ops used underneath)+ # === 5. Accumulator (Register-Resident) ===acc = tl.zeros([BLOCK_H, BLOCK_W], dtype=tl.float32)- # --- 4. Hot Loop (Pointer Chasing) ---+ # === 6. Triple-Nested Pointer Chasing ===+ # ОПТИМИЗАЦИЯ: Три уровня указателей для устранения всех MUL из горячих циклов- # Локальные переменные для указателей, чтобы избежать memory traffic- curr_in_ch = ptr_in_base- curr_wei_ch = ptr_wei_base+ ptr_in_ch = ptr_in_base+ ptr_wei_ch = ptr_wei_base- # Внешний цикл по каналам (Reduction)for cin in range(C_IN):+ # Level 2: Kernel Height+ ptr_in_kh = ptr_in_ch+ ptr_wei_kh = ptr_wei_ch- # Временные указатели для Spatial Dimensions- curr_in_row = curr_in_ch- curr_wei_row = curr_wei_ch-- # Проход по высоте ядраfor kh in range(K):+ # Level 3: Kernel Width (hottest loop)+ ptr_in_kw = ptr_in_kh+ ptr_wei_kw = ptr_wei_kh- # Входим в inner-most loop.- # Копируем указатели. Компилятор развернет это в регистры.- curr_in_ptr = curr_in_row- curr_wei_ptr = curr_wei_row-- # Проход по ширине ядра- # Если K известно (например 3), компилятор полностью развернет этот цикл.for kw in range(K):- # 1. Load Weight (Scalar -> Broadcast)- # Загружаем 1 вес. A100 L1 кэш отлично справляется с этим.- # Адрес уже посчитан инкрементом.- wei_val = tl.load(curr_wei_ptr)+ # === HOTTEST CODE PATH ===+ # Только 2 loads + 1 FMA + 2 increments- # 2. Load Input (Vectorized Block)- # Загружаем [BLOCK_H, BLOCK_W] значений.- # В A100 это идет через L1/Tex кэш.- in_val = tl.load(curr_in_ptr, mask=mask_block, other=0.0)+ # Load weight (scalar broadcast)+ w = tl.load(ptr_wei_kw)- # 3. FMA (Fused Multiply Add)- acc = acc + in_val * wei_val+ # Load input (vectorized 2D)+ x = tl.load(ptr_in_kw, mask=mask_2d, other=0.0)- # 4. Pointer Increment (Cheap ALU op)- # Вместо умножения `idx * stride`, делаем `ptr += stride`.- # stride_w_w и stride_in_w обычно равны 1,- # но мы используем переменные для универсальности.- curr_wei_ptr += stride_w_w- curr_in_ptr += stride_in_w-- # Сдвигаем строку ядра вниз- curr_in_row += stride_in_h- curr_wei_row += stride_w_h+ # FMA+ acc += x * w++ # Pointer increments (cheap ADD operations)+ ptr_in_kw += stride_in_w+ ptr_wei_kw += stride_w_w- # Переходим к следующему каналу- curr_in_ch += stride_in_c- curr_wei_ch += stride_w_in+ # Level 2 increments+ ptr_in_kh += stride_in_h+ ptr_wei_kh += stride_w_h++ # Level 1 increments+ ptr_in_ch += stride_in_c+ ptr_wei_ch += stride_w_in++ # === 7. Store Result ===+ tl.store(ptr_out, acc, mask=mask_2d)- # --- 5. Writeback ---- tl.store(ptr_out, acc, mask=mask_block)-def custom_kernel(data):"""- A100 Optimized Entry Point.+ Production wrapper for A100-optimized kernel."""input_tensor, kernel, output_tensor = data- # 1. Memory layout check- # Triton векторизация работает x4 быстрее на contiguous данных- if not input_tensor.is_contiguous():- input_tensor = input_tensor.contiguous()- if not kernel.is_contiguous():- kernel = kernel.contiguous()+ # Ensure contiguous memory layout (critical for A100 coalescing)+ input_tensor = input_tensor.contiguous()+ kernel = kernel.contiguous()- # 2. Shape extractionbatch, c_in, h_in, w_in = input_tensor.shapec_out, _, k_h, k_w = kernel.shapeh_out = h_in - k_h + 1w_out = w_in - k_w + 1- # 3. Grid strategy- # Делим выходное изображение на блоки.- # Z-измерение объединяет Batch и Output Channels для максимального параллелизма.grid = lambda META: (triton.cdiv(w_out, META['BLOCK_W']),triton.cdiv(h_out, META['BLOCK_H']),batch * c_out)- # 4. Launch- conv2d_kernel_a100_ultra[grid](+ conv2d_kernel_a100_ultimate[grid](input_tensor, kernel, output_tensor,- # Pass strides directly from tensors*input_tensor.stride(),*kernel.stride(),*output_tensor.stride(),- # Pass dimensionsh_in, w_in, h_out, w_out,c_in, c_out, k_h,- # META params (BLOCK_H, BLOCK_W) handled by autotuner)return output_tensor+
scrolls · 268 diff lines total
Best evidence level for this revision: reported
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