91 lines
2.7 KiB
Python
91 lines
2.7 KiB
Python
import itertools
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from typing import Optional, Tuple
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import torch
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import triton
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import triton.testing
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from sgl_kernel import sgl_per_token_quant_fp8
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from vllm import _custom_ops as ops
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from sglang.srt.utils import is_hip
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is_hip_ = is_hip()
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fp8_type_ = torch.float8_e4m3fnuz if is_hip_ else torch.float8_e4m3fn
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def vllm_per_token_quant_fp8(
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input: torch.Tensor,
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) -> Tuple[torch.Tensor, torch.Tensor]:
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return ops.scaled_fp8_quant(input, use_per_token_if_dynamic=True)
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def sglang_per_token_quant_fp8(
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input: torch.Tensor,
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) -> Tuple[torch.Tensor, torch.Tensor]:
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scale = torch.zeros(input.size(0), device=input.device, dtype=torch.float32)
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output = torch.empty_like(input, device=input.device, dtype=fp8_type_)
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sgl_per_token_quant_fp8(input, output, scale)
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return output, scale
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def calculate_diff(batch_size: int, seq_len: int):
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"""Calculate difference between VLLM and SGLang implementations."""
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device = torch.device("cuda")
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x = torch.rand((batch_size, seq_len), dtype=torch.float16, device=device)
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vllm_out, vllm_scale = vllm_per_token_quant_fp8(x)
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sglang_out, sglang_scale = sglang_per_token_quant_fp8(x)
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scale_diff = torch.abs(vllm_scale - sglang_scale).mean().item()
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output_diff = torch.abs(vllm_out.float() - sglang_out.float()).mean().item()
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if torch.allclose(
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vllm_out.to(torch.float32), sglang_out.to(torch.float32), rtol=1e-3, atol=1e-5
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) and torch.allclose(vllm_scale, sglang_scale, rtol=1e-3, atol=1e-5):
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print("✅ All implementations match")
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else:
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print("❌ Implementations differ")
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batch_size_range = [16, 32, 64, 128]
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seq_len_range = [64, 128, 256, 512, 1024, 2048, 4096]
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configs = list(itertools.product(batch_size_range, seq_len_range))
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@triton.testing.perf_report(
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triton.testing.Benchmark(
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x_names=["batch_size", "seq_len"],
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x_vals=configs,
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line_arg="provider",
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line_vals=["vllm", "sglang"],
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line_names=["VLLM", "SGL Kernel"],
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styles=[("blue", "-"), ("green", "-")],
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ylabel="us",
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plot_name="per-token-dynamic-quant-fp8-performance",
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args={},
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)
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)
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def benchmark_quantization(batch_size, seq_len, provider):
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dtype = torch.float16
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device = torch.device("cuda")
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x = torch.randn(batch_size * seq_len, 4096, device=device, dtype=dtype)
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quantiles = [0.5, 0.2, 0.8]
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if provider == "vllm":
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fn = lambda: vllm_per_token_quant_fp8(x.clone())
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elif provider == "sglang":
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fn = lambda: sglang_per_token_quant_fp8(x.clone())
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ms, min_ms, max_ms = triton.testing.do_bench(fn, quantiles=quantiles)
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return 1000 * ms, 1000 * max_ms, 1000 * min_ms
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if __name__ == "__main__":
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calculate_diff(batch_size=4, seq_len=4096)
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benchmark_quantization.run(print_data=True)
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