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submission 99242

Petr_Rocoss · python · License unknown

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No package. Vendor the mirrored source: 169 lines, June 9 Researcher Reciprocity License v1.0.

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
2D convolutionsuite of 5 cases
NVIDIA L4
757.8ms
#8 of 21
2025-11-23

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 = 8triton.Config({'BLOCK_H': 16, 'BLOCK_W': 128}, num_warps=8, num_stages=5),
stages = 5triton.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 середина
triton.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 lines
BLOCK_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 lines
batch_idx = pid_z // C_OUT
out_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_OUT
mask_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 ядра
for 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 extraction
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
- # 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 dimensions
h_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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