Adding comparison for different fp8 matmuls

benchmarks/fp8_matmul.py

@@ -0,0 +1,276 @@
+import itertools
+from dataclasses import dataclass
+from typing import List, Optional
+import torch
+from tabulate import tabulate
+from tqdm import tqdm
+from jsonargparse import CLI
+from pathlib import Path
+from transformer_nuggets.utils.benchmark import benchmark_cuda_function_in_microseconds
+from torchao.float8.inference import (
+    addmm_float8_unwrapped_inference,
+    preprocess_data,
+    Float8MMConfig,
+)
+from transformer_nuggets.fp8.fp8_matmul import (
+    matmul_persistent,
+    matmul_tma_persistent,
+    matmul_device_tma_persistent,
+)
+from enum import Enum
+import csv
+
+torch._dynamo.config.cache_size_limit = 1000
+
+
+class FP8Kernel(Enum):
+    PERSISTENT = "Persistent"
+    PERSISTENT_TMA = "Persistent-TMA"
+    DEVICE_TMA = "Device-TMA"
+    SCALED_MM = "Scaled-MM"
+
+
+class ScalingStrategy(Enum):
+    PER_TENSOR = "PerTensor"
+    PER_ROW = "PerRow"
+
+
+def is_col_major(stride):
+    assert len(stride) == 2, "is_col_major only supports 2D tensors"
+    return stride[1] > stride[0] and stride[0] == 1
+
+
+def get_fp8_matmul(
+    A: torch.Tensor, B: torch.Tensor, scaling_strategy: ScalingStrategy, fp8_kernel: FP8Kernel
+):
+    A_fp8 = A.to(torch.float8_e4m3fn)
+    B_fp8 = B.to(torch.float8_e4m3fn)
+    A_fp8, B_fp8 = preprocess_data(A_fp8, B_fp8, Float8MMConfig(use_fast_accum=True))
+
+    if scaling_strategy == ScalingStrategy.PER_TENSOR:
+        a_scale = torch.tensor(1, device="cuda", dtype=torch.float32)
+        b_scale = torch.tensor(1, device="cuda", dtype=torch.float32)
+    elif scaling_strategy == ScalingStrategy.PER_ROW:
+        a_scale = torch.ones((A_fp8.size(0), 1), device="cuda", dtype=torch.float32)
+        b_scale = torch.ones((B_fp8.size(1), 1), device="cuda", dtype=torch.float32).T
+    else:
+        raise ValueError(f"Invalid scaling strategy: {scaling_strategy}")
+    if fp8_kernel == FP8Kernel.PERSISTENT:
+        return lambda: matmul_persistent(A_fp8, a_scale, B_fp8, b_scale, torch.bfloat16)
+    elif fp8_kernel == FP8Kernel.PERSISTENT_TMA:
+        return lambda: matmul_tma_persistent(A_fp8, a_scale, B_fp8, b_scale, torch.bfloat16)
+    elif fp8_kernel == FP8Kernel.DEVICE_TMA:
+        return lambda: matmul_device_tma_persistent(A_fp8, a_scale, B_fp8, b_scale, torch.bfloat16)
+    elif fp8_kernel == FP8Kernel.SCALED_MM:
+        return lambda: addmm_float8_unwrapped_inference(
+            A_fp8, a_scale, B_fp8, b_scale, output_dtype=torch.bfloat16, use_fast_accum=True
+        )
+    else:
+        raise ValueError(f"Invalid FP8 kernel: {fp8_kernel}")
+
+
+@dataclass(frozen=True)
+class ExperimentConfig:
+    M: int
+    K: int
+    N: int
+    scaling_strategy: ScalingStrategy
+    fp8_kernel: FP8Kernel
+    compile: bool
+
+
+@dataclass(frozen=True)
+class ExperimentResult:
+    bf16_time: float
+    fp8_time: float
+    bf16_tflops: float
+    fp8_tflops: float
+
+
+@dataclass(frozen=True)
+class Experiment:
+    config: ExperimentConfig
+    result: ExperimentResult
+
+
+def calculate_tflops(M: int, N: int, K: int, time_us: float) -> float:
+    """Calculate TFLOPS (Tera Floating Point Operations Per Second)"""
+    flops = 2 * M * N * K  # Number of floating point operations for matrix multiplication
+    tflops = (flops / time_us) / 1e6  # Convert to TFLOPS
+    return tflops
+
+
+def run_experiment(config: ExperimentConfig) -> ExperimentResult:
+    device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+    A = torch.randn(config.M, config.K, device=device, dtype=torch.bfloat16)
+    B = torch.randn(config.K, config.N, device=device, dtype=torch.bfloat16)
+
+    bf16_matmul = lambda x, y: torch.matmul(x, y)
+    fp8_matmul = get_fp8_matmul(A, B, config.scaling_strategy, config.fp8_kernel)
+
+    if config.compile and config.fp8_kernel == FP8Kernel.SCALED_MM:
+        bf16_matmul = torch.compile(bf16_matmul)
+        fp8_matmul = torch.compile(fp8_matmul, mode="max-autotune")
+
+    # Warmup phase
+    warmup_iterations = 5
+    for _ in range(warmup_iterations):
+        _ = bf16_matmul(A, B)
+        _ = fp8_matmul()
+    torch.cuda.synchronize()
+
+    # Actual benchmarking
+    bf16_time = benchmark_cuda_function_in_microseconds(lambda: bf16_matmul(A, B))
+    fp8_time = benchmark_cuda_function_in_microseconds(fp8_matmul)
+
+    # Calculate TFLOPS
+    bf16_tflops = calculate_tflops(config.M, config.N, config.K, bf16_time)
+    fp8_tflops = calculate_tflops(config.M, config.N, config.K, fp8_time)
+
+    # Baseline fp8_matmul correctness
+    scaled_mm_base = get_fp8_matmul(A, B, config.scaling_strategy, FP8Kernel.SCALED_MM)
+    out_base = scaled_mm_base()
+    out = fp8_matmul()
+    # Failing on one sample with large N
+    torch.testing.assert_close(out, out_base)
+
+    return ExperimentResult(
+        bf16_time=bf16_time, fp8_time=fp8_time, bf16_tflops=bf16_tflops, fp8_tflops=fp8_tflops
+    )
+
+
+def print_results(experiments: List[Experiment], save_path: Optional[Path] = None):
+    headers = [
+        "M",
+        "K",
+        "N",
+        "Scaling Strategy",
+        "Fp8 Kernel",
+        "Compiled",
+        "BF16 Time (ms)",
+        "FP8 Time (ms)",
+        "Speedup",
+        "BF16 TFLOPS",
+        "FP8 TFLOPS",
+        "TFLOPS Ratio",
+    ]
+    rows = []
+    for experiment in experiments:
+        config = experiment.config
+        result = experiment.result
+        speedup = result.bf16_time / result.fp8_time
+        tflops_ratio = result.fp8_tflops / result.bf16_tflops
+        rows.append(
+            [
+                config.M,
+                config.K,
+                config.N,
+                config.scaling_strategy,
+                config.fp8_kernel,
+                config.compile,
+                f"{result.bf16_time:.4f}",
+                f"{result.fp8_time:.4f}",
+                f"{speedup:.2f}x",
+                f"{result.bf16_tflops:.2f}",
+                f"{result.fp8_tflops:.2f}",
+                f"{tflops_ratio:.2f}x",
+            ]
+        )
+    print(tabulate(rows, headers=headers, floatfmt=".4f"))
+
+    if save_path is not None:
+        with open(save_path, "w", newline="") as f:
+            writer = csv.writer(f)
+            writer.writerow(headers)
+            writer.writerows(rows)
+        print(f"💾 Results saved to: {save_path}")
+
+
+def get_configs_varying_k() -> List[ExperimentConfig]:
+    shapes = [(8192, K, 8192) for K in range(512, 8193, 512)]
+    scaling_strategies = [ScalingStrategy.PER_ROW]
+    compile_options = [False]
+    configs = []
+    fp8_kernels = [
+        FP8Kernel.SCALED_MM,
+        FP8Kernel.PERSISTENT,
+        FP8Kernel.PERSISTENT_TMA,
+        FP8Kernel.DEVICE_TMA,
+    ]
+
+    for (M, K, N), strategy, compile, kernel in itertools.product(
+        shapes, scaling_strategies, compile_options, fp8_kernels
+    ):
+        configs.append(
+            ExperimentConfig(
+                M=M, K=K, N=N, scaling_strategy=strategy, compile=compile, fp8_kernel=kernel
+            )
+        )
+    return configs
+
+
+def get_configs() -> List[ExperimentConfig]:
+    shapes = [
+        (8192, 512, 8192),
+        (1024, 20512, 2048),
+        (196608, 656, 256),
+        (1024, 1024, 137568),
+        (1024, 256, 137568),
+        (1024, 1568, 1664),
+        (1024, 1024, 43040),
+        (1024, 43040, 2048),
+        (1024, 1568, 1920),
+        (1024, 1024, 20512),
+        (137216, 1920, 384),
+        (1024, 5632, 98304),
+        (196608, 656, 624),
+        (196608, 3600, 624),
+        (1024, 1568, 640),
+        (1024, 192, 98304),
+        (1024, 1568, 1024),
+        (1024, 137568, 2048),
+        # (1024, 24576, 98304), Fails on for a large N values
+        (1024, 1024, 1024),
+    ]
+
+    scaling_strategies = [ScalingStrategy.PER_TENSOR]
+    compile_options = [False]
+    configs = []
+    fp8_kernels = [
+        FP8Kernel.SCALED_MM,
+        FP8Kernel.PERSISTENT,
+        FP8Kernel.PERSISTENT_TMA,
+        FP8Kernel.DEVICE_TMA,
+    ]
+    for (M, K, N), strategy, compile, kernel in itertools.product(
+        shapes, scaling_strategies, compile_options, fp8_kernels
+    ):
+        configs.append(
+            ExperimentConfig(
+                M=M, K=K, N=N, scaling_strategy=strategy, compile=compile, fp8_kernel=kernel
+            )
+        )
+    return configs
+
+
+def main(save_path: Optional[str] = None):
+    """Benchmark FP8 MatMul with different configurations.
+
+    Args:
+        save_path (Optional[str], optional): Path to save the results. Defaults to None.
+    """
+    torch.random.manual_seed(123)
+    configs = get_configs_varying_k()
+    results = []
+    if save_path is not None:
+        save_path = Path(save_path)
+        save_path = save_path.with_suffix(".csv")
+        save_path.parent.mkdir(parents=True, exist_ok=True)
+    for config in tqdm(configs):
+        result = run_experiment(config)
+        results.append(Experiment(config=config, result=result))
+    print_results(results, save_path)
+
+
+if __name__ == "__main__":
+    CLI(main)