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natten / benchmarks /benchmark.py

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	# Micro-benchmark for the fused neighborhood attention path.
	#
	# Compares NATTEN's auto-selected fused backend against PyTorch SDPA over the
	# full sequence (which computes strictly more attention, but is the baseline
	# people care about) across a few window sizes.
	#
	# Run inside `kernel-builder devshell` / `testshell`, or any env where the
	# built `natten` package is importable.

	import argparse
	import time

	import torch
	from torch.nn.functional import scaled_dot_product_attention

	from natten.functional import na2d


	def benchmark(fn, warmup: int = 10, iters: int = 50) -> float:
	for _ in range(warmup):
	fn()
	torch.cuda.synchronize()
	start = time.perf_counter()
	for _ in range(iters):
	fn()
	torch.cuda.synchronize()
	return (time.perf_counter() - start) / iters * 1e3


	def main() -> None:
	parser = argparse.ArgumentParser()
	parser.add_argument("--batch", type=int, default=1)
	parser.add_argument("--heads", type=int, default=8)
	parser.add_argument("--head-dim", type=int, default=64)
	parser.add_argument("--size", type=int, default=64, help="2-D token layout side")
	parser.add_argument(
	"--dtype", choices=["float16", "bfloat16"], default="bfloat16"
	)
	args = parser.parse_args()

	dtype = getattr(torch, args.dtype)
	device = "cuda"
	shape = (args.batch, args.size, args.size, args.heads, args.head_dim)

	q = torch.randn(shape, device=device, dtype=dtype)
	k = torch.randn_like(q)
	v = torch.randn_like(q)

	# [B, H, seq, D] view for SDPA
	q_sdpa = q.flatten(1, 2).permute(0, 2, 1, 3).contiguous()
	k_sdpa = k.flatten(1, 2).permute(0, 2, 1, 3).contiguous()
	v_sdpa = v.flatten(1, 2).permute(0, 2, 1, 3).contiguous()

	sdpa_ms = benchmark(lambda: scaled_dot_product_attention(q_sdpa, k_sdpa, v_sdpa))
	print(
	f"device={torch.cuda.get_device_name()} dtype={args.dtype} "
	f"layout={args.size}x{args.size} heads={args.heads} head_dim={args.head_dim}"
	)
	print(f"{'kernel':>24} {'ms':>10} {'vs SDPA':>10}")
	print(f"{'sdpa (full self-attn)':>24} {sdpa_ms:>10.3f} {'1.00x':>10}")

	for window in (7, 13, 21, 33):
	if window > args.size:
	continue
	na_ms = benchmark(lambda: na2d(q, k, v, kernel_size=(window, window)))
	print(
	f"{f'na2d k={window}x{window}':>24} {na_ms:>10.3f} "
	f"{f'{sdpa_ms / na_ms:.2f}x':>10}"
	)


	if __name__ == "__main__":
	main()