[Benchmark] Refactor benchmark script for fp8 & int8 (#19627)

Signed-off-by: yewentao256 <zhyanwentao@126.com>
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Wentao Ye 2025-06-15 03:15:37 -04:00 committed by GitHub
parent 0b73736a0d
commit 3d330c4c09
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2 changed files with 184 additions and 280 deletions

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@ -1,5 +1,4 @@
# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
import argparse
import copy
import itertools
@ -11,6 +10,80 @@ from vllm._custom_ops import cutlass_scaled_mm as vllm_scaled_mm
from vllm._custom_ops import scaled_fp8_quant as vllm_scaled_fp8_quant
from vllm.triton_utils import triton
PROVIDER_CFGS = {
"torch-bf16": dict(enabled=True),
"fp8-tensor-w-token-a": dict(
w="tensor", a="token", no_a_quant=False, enabled=False
),
"fp8-tensor-w-tensor-a": dict(
w="tensor", a="tensor", no_a_quant=False, enabled=True
),
"fp8-channel-w-token-a": dict(
w="channel", a="token", no_a_quant=False, enabled=True
),
"fp8-channel-w-tensor-a": dict(
w="channel", a="tensor", no_a_quant=False, enabled=False
),
"fp8-tensor-w-token-a-noquant": dict(
w="tensor", a="token", no_a_quant=True, enabled=False
),
"fp8-tensor-w-tensor-a-noquant": dict(
w="tensor", a="tensor", no_a_quant=True, enabled=True
),
"fp8-channel-w-token-a-noquant": dict(
w="channel", a="token", no_a_quant=True, enabled=True
),
"fp8-channel-w-tensor-a-noquant": dict(
w="channel", a="tensor", no_a_quant=True, enabled=False
),
}
_enabled = [k for k, v in PROVIDER_CFGS.items() if v["enabled"]]
def _quant_weight_fp8(b: torch.Tensor, w_type: str, device: str):
if w_type == "tensor":
scale_b = torch.ones(1, device=device, dtype=torch.float32)
b_fp8, scale_b_fp8 = vllm_scaled_fp8_quant(b, scale_b)
else:
b_fp8, scale_b_fp8 = vllm_scaled_fp8_quant(b, use_per_token_if_dynamic=True)
return b_fp8.t(), scale_b_fp8
def build_fp8_runner(cfg, a, b, dtype, device):
b_fp8, scale_b_fp8 = _quant_weight_fp8(b, cfg["w"], device)
scale_a_const = (
torch.ones(1, device=device, dtype=torch.float32)
if cfg["a"] == "tensor"
else None
)
if cfg["no_a_quant"]:
if cfg["a"] == "tensor":
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(a, scale_a_const)
else:
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(a, use_per_token_if_dynamic=True)
def run():
return vllm_scaled_mm(a_fp8, b_fp8, scale_a_fp8, scale_b_fp8, dtype)
return run
if cfg["a"] == "tensor":
def run():
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(a, scale_a_const)
return vllm_scaled_mm(a_fp8, b_fp8, scale_a_fp8, scale_b_fp8, dtype)
else:
def run():
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(a, use_per_token_if_dynamic=True)
return vllm_scaled_mm(a_fp8, b_fp8, scale_a_fp8, scale_b_fp8, dtype)
return run
@triton.testing.perf_report(
triton.testing.Benchmark(
@ -18,28 +91,8 @@ from vllm.triton_utils import triton
x_vals=[1, 16, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384],
x_log=False,
line_arg="provider",
line_vals=[
"torch-bf16",
# "fp8-tensor-w-token-a",
"fp8-tensor-w-tensor-a",
"fp8-channel-w-token-a",
# "fp8-channel-w-tensor-a",
# "fp8-tensor-w-token-a-noquant",
"fp8-tensor-w-tensor-a-noquant",
"fp8-channel-w-token-a-noquant",
# "fp8-channel-w-tensor-a-noquant",
],
line_names=[
"torch-bf16",
# "fp8-tensor-w-token-a",
"fp8-tensor-w-tensor-a",
"fp8-channel-w-token-a",
# "fp8-channel-w-tensor-a",
# "fp8-tensor-w-token-a-noquant",
"fp8-tensor-w-tensor-a-noquant",
"fp8-channel-w-token-a-noquant",
# "fp8-channel-w-tensor-a-noquant",
],
line_vals=_enabled,
line_names=_enabled,
ylabel="TFLOP/s (larger is better)",
plot_name="BF16 vs FP8 GEMMs",
args={},
@ -50,144 +103,34 @@ def benchmark(batch_size, provider, N, K):
device = "cuda"
dtype = torch.bfloat16
# Create input tensors
a = torch.randn((M, K), device=device, dtype=dtype)
b = torch.randn((N, K), device=device, dtype=dtype)
quantiles = [0.5, 0.2, 0.8]
if "torch-bf16" in provider:
if provider == "torch-bf16":
ms, min_ms, max_ms = triton.testing.do_bench_cudagraph(
lambda: torch.nn.functional.linear(a, b), quantiles=quantiles
)
elif "fp8" in provider:
# Weights are always quantized ahead of time
if "noquant" in provider:
# For no quantization, we just measure the GEMM
if "tensor-w-token-a" in provider:
# Dynamic per-token quant for A, per-tensor quant for B
b_fp8, scale_b_fp8 = vllm_scaled_fp8_quant(b)
assert scale_b_fp8.numel() == 1
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(
a, use_per_token_if_dynamic=True
)
def run_quant():
return vllm_scaled_mm(a_fp8, b_fp8, scale_a_fp8, scale_b_fp8, dtype)
elif "tensor-w-tensor-a" in provider:
# Static per-tensor quantization with fixed scales
# for both A and B
scale_a = torch.tensor([1.0], device=device, dtype=torch.float32)
scale_b = torch.tensor([1.0], device=device, dtype=torch.float32)
b_fp8, scale_b_fp8 = vllm_scaled_fp8_quant(b, scale_b)
assert scale_b_fp8.numel() == 1
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(a, scale_a)
def run_quant():
return vllm_scaled_mm(a_fp8, b_fp8, scale_a_fp8, scale_b_fp8, dtype)
elif "channel-w-token-a" in provider:
# Static per-channel quantization for weights, per-token
# quant for A
scale_b = torch.tensor((N,), device=device, dtype=torch.float32)
b_fp8, scale_b_fp8 = vllm_scaled_fp8_quant(b, scale_b)
scale_b_fp8 = scale_b_fp8.expand(N).contiguous()
assert scale_b_fp8.numel() == N
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(
a, use_per_token_if_dynamic=True
)
def run_quant():
return vllm_scaled_mm(a_fp8, b_fp8, scale_a_fp8, scale_b_fp8, dtype)
elif "channel-w-tensor-a" in provider:
# Static per-channel quantization for weights, per-tensor
# quant for A
scale_a = torch.tensor([1.0], device=device, dtype=torch.float32)
scale_b = torch.tensor((N,), device=device, dtype=torch.float32)
b_fp8, scale_b_fp8 = vllm_scaled_fp8_quant(b, scale_b)
scale_b_fp8 = scale_b_fp8.expand(N).contiguous()
assert scale_b_fp8.numel() == N
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(a, scale_a)
def run_quant():
return vllm_scaled_mm(a_fp8, b_fp8, scale_a_fp8, scale_b_fp8, dtype)
else:
# In these cases, we quantize the activations during the GEMM call
if "tensor-w-token-a" in provider:
# Dynamic per-token quant for A, per-tensor quant for B
b_fp8, scale_b_fp8 = vllm_scaled_fp8_quant(b)
assert scale_b_fp8.numel() == 1
def run_quant():
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(
a, use_per_token_if_dynamic=True
)
return vllm_scaled_mm(a_fp8, b_fp8, scale_a_fp8, scale_b_fp8, dtype)
elif "tensor-w-tensor-a" in provider:
# Static per-tensor quantization with fixed scales
# for both A and B
scale_a = torch.tensor([1.0], device=device, dtype=torch.float32)
scale_b = torch.tensor([1.0], device=device, dtype=torch.float32)
b_fp8, scale_b_fp8 = vllm_scaled_fp8_quant(b, scale_b)
assert scale_b_fp8.numel() == 1
def run_quant():
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(a, scale_a)
return vllm_scaled_mm(a_fp8, b_fp8, scale_a_fp8, scale_b_fp8, dtype)
elif "channel-w-token-a" in provider:
# Static per-channel quantization for weights, per-token
# quant for A
scale_b = torch.tensor((N,), device=device, dtype=torch.float32)
b_fp8, scale_b_fp8 = vllm_scaled_fp8_quant(b, scale_b)
scale_b_fp8 = scale_b_fp8.expand(N).contiguous()
assert scale_b_fp8.numel() == N
def run_quant():
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(
a, use_per_token_if_dynamic=True
)
return vllm_scaled_mm(a_fp8, b_fp8, scale_a_fp8, scale_b_fp8, dtype)
elif "channel-w-tensor-a" in provider:
# Static per-channel quantization for weights, per-tensor
# quant for A
scale_a = torch.tensor([1.0], device=device, dtype=torch.float32)
scale_b = torch.tensor((N,), device=device, dtype=torch.float32)
b_fp8, scale_b_fp8 = vllm_scaled_fp8_quant(b, scale_b)
scale_b_fp8 = scale_b_fp8.expand(N).contiguous()
assert scale_b_fp8.numel() == N
def run_quant():
a_fp8, scale_a_fp8 = vllm_scaled_fp8_quant(a, scale_a)
return vllm_scaled_mm(a_fp8, b_fp8, scale_a_fp8, scale_b_fp8, dtype)
b_fp8 = b_fp8.t()
else:
cfg = PROVIDER_CFGS[provider]
run_quant = build_fp8_runner(cfg, a, b, dtype, device)
ms, min_ms, max_ms = triton.testing.do_bench_cudagraph(
lambda: run_quant(), quantiles=quantiles
)
# Calculate TFLOP/s, two flops per multiply-add
tflops = lambda ms: (2 * M * N * K) * 1e-12 / (ms * 1e-3)
return tflops(ms), tflops(max_ms), tflops(min_ms)
to_tflops = lambda t_ms: (2 * M * N * K) * 1e-12 / (t_ms * 1e-3)
return to_tflops(ms), to_tflops(max_ms), to_tflops(min_ms)
def prepare_shapes(args):
KN_model_names = []
models_tps = list(itertools.product(args.models, args.tp_sizes))
for model, tp_size in models_tps:
assert model in WEIGHT_SHAPES
for KN, tp_split_dim in copy.deepcopy(WEIGHT_SHAPES[model]):
KN[tp_split_dim] = KN[tp_split_dim] // tp_size
out = []
for model, tp_size in itertools.product(args.models, args.tp_sizes):
for KN, tp_dim in copy.deepcopy(WEIGHT_SHAPES[model]):
KN[tp_dim] //= tp_size
KN.append(model)
KN_model_names.append(KN)
return KN_model_names
out.append(KN)
return out
if __name__ == "__main__":
@ -197,21 +140,13 @@ if __name__ == "__main__":
nargs="+",
type=str,
default=["meta-llama/Llama-3.1-8B-Instruct"],
choices=[*WEIGHT_SHAPES.keys()],
help="List of models to benchmark",
)
parser.add_argument(
"--tp-sizes",
nargs="+",
type=int,
default=[1],
help="List of tensor parallel sizes",
choices=list(WEIGHT_SHAPES.keys()),
)
parser.add_argument("--tp-sizes", nargs="+", type=int, default=[1])
args = parser.parse_args()
KN_model_names = prepare_shapes(args)
for K, N, model_name in KN_model_names:
print(f"{model_name}, N={N} K={K}, BF16 vs FP8 GEMMs TFLOP/s:")
for K, N, model in prepare_shapes(args):
print(f"{model}, N={N} K={K}, BF16 vs FP8 GEMMs TFLOP/s:")
benchmark.run(
print_data=True,
show_plots=True,

View File

@ -11,6 +11,84 @@ from vllm._custom_ops import cutlass_scaled_mm as vllm_scaled_mm
from vllm._custom_ops import scaled_int8_quant as vllm_scaled_int8_quant
from vllm.triton_utils import triton
PROVIDER_CFGS = {
"torch-bf16": dict(enabled=True),
"int8-tensor-w-token-a": dict(
w="tensor", a="token", no_a_quant=False, enabled=False
),
"int8-tensor-w-tensor-a": dict(
w="tensor", a="tensor", no_a_quant=False, enabled=True
),
"int8-channel-w-token-a": dict(
w="channel", a="token", no_a_quant=False, enabled=True
),
"int8-channel-w-tensor-a": dict(
w="channel", a="tensor", no_a_quant=False, enabled=False
),
"int8-tensor-w-token-a-noquant": dict(
w="tensor", a="token", no_a_quant=True, enabled=False
),
"int8-tensor-w-tensor-a-noquant": dict(
w="tensor", a="tensor", no_a_quant=True, enabled=True
),
"int8-channel-w-token-a-noquant": dict(
w="channel", a="token", no_a_quant=True, enabled=True
),
"int8-channel-w-tensor-a-noquant": dict(
w="channel", a="tensor", no_a_quant=True, enabled=False
),
}
def _quant_weight(b, w_type, device):
if w_type == "tensor":
scale_b = torch.ones(1, device=device, dtype=torch.float32)
b_int8, scale_b_int8, _ = vllm_scaled_int8_quant(b, scale_b)
assert scale_b_int8.numel() == 1
else: # channel
b_int8, scale_b_int8, _ = vllm_scaled_int8_quant(b)
assert scale_b_int8.numel() == b.shape[0]
return b_int8.t(), scale_b_int8
def build_int8_runner(cfg, a, b, dtype, device):
# quant before running the kernel
b_int8, scale_b_int8 = _quant_weight(b, cfg["w"], device)
scale_a_const = None
if cfg["a"] == "tensor":
scale_a_const = torch.ones(1, device=device, dtype=torch.float32)
# no quant, create activation ahead
if cfg["no_a_quant"]:
if cfg["a"] == "tensor":
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a, scale_a_const)
else: # token
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a)
def run_quant():
return vllm_scaled_mm(a_int8, b_int8, scale_a_int8, scale_b_int8, dtype)
return run_quant
# dynamic quant, create activation inside
if cfg["a"] == "tensor":
def run_quant():
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a, scale_a_const)
return vllm_scaled_mm(a_int8, b_int8, scale_a_int8, scale_b_int8, dtype)
else: # token
def run_quant():
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a)
return vllm_scaled_mm(a_int8, b_int8, scale_a_int8, scale_b_int8, dtype)
return run_quant
_enabled = [k for k, v in PROVIDER_CFGS.items() if v.get("enabled")]
@triton.testing.perf_report(
triton.testing.Benchmark(
@ -18,28 +96,8 @@ from vllm.triton_utils import triton
x_vals=[1, 16, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384],
x_log=False,
line_arg="provider",
line_vals=[
"torch-bf16",
# "int8-tensor-w-token-a",
"int8-tensor-w-tensor-a",
"int8-channel-w-token-a",
# "int8-channel-w-tensor-a",
# "int8-tensor-w-token-a-noquant",
"int8-tensor-w-tensor-a-noquant",
"int8-channel-w-token-a-noquant",
# "int8-channel-w-tensor-a-noquant",
],
line_names=[
"torch-bf16",
# "int8-tensor-w-token-a",
"int8-tensor-w-tensor-a",
"int8-channel-w-token-a",
# "int8-channel-w-tensor-a",
# "int8-tensor-w-token-a-noquant",
"int8-tensor-w-tensor-a-noquant",
"int8-channel-w-token-a-noquant",
# "int8-channel-w-tensor-a-noquant",
],
line_vals=_enabled,
line_names=[k for k in _enabled],
ylabel="TFLOP/s (larger is better)",
plot_name="BF16 vs INT8 GEMMs",
args={},
@ -54,114 +112,26 @@ def benchmark(batch_size, provider, N, K):
quantiles = [0.5, 0.2, 0.8]
if "torch-bf16" in provider:
if provider == "torch-bf16":
ms, min_ms, max_ms = triton.testing.do_bench_cudagraph(
lambda: torch.nn.functional.linear(a, b), quantiles=quantiles
)
elif "int8" in provider:
# Weights are always quantized ahead of time
if "noquant" in provider:
# For "no quant", we don't measure the time for activations
if "tensor-w-token-a" in provider:
# Dynamic per-token quant for A, static per-tensor quant for B
scale_b = torch.tensor([1.0], device=device, dtype=torch.float32)
b_int8, scale_b_int8, _ = vllm_scaled_int8_quant(b, scale_b)
assert scale_b_int8.numel() == 1
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a)
elif "tensor-w-tensor-a" in provider:
# Static per-tensor quantization with fixed scales for both A and B
scale_a = torch.tensor([1.0], device=device, dtype=torch.float32)
scale_b = torch.tensor([1.0], device=device, dtype=torch.float32)
b_int8, scale_b_int8, _ = vllm_scaled_int8_quant(b, scale_b)
assert scale_b_int8.numel() == 1
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a, scale_a)
elif "channel-w-token-a" in provider:
# Dynamic per-channel quantization for weights, per-token quant for A
b_int8, scale_b_int8, _ = vllm_scaled_int8_quant(b)
assert scale_b_int8.numel() == N
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a)
elif "channel-w-tensor-a" in provider:
# Dynamic per-channel quantization for weights, per-tensor quant for A
scale_a = torch.tensor([1.0], device=device, dtype=torch.float32)
b_int8, scale_b_int8, _ = vllm_scaled_int8_quant(b)
assert scale_b_int8.numel() == N
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a, scale_a)
def run_quant():
return vllm_scaled_mm(a_int8, b_int8, scale_a_int8, scale_b_int8, dtype)
else:
# Quantize the activations during the GEMM call
if "tensor-w-token-a" in provider:
# Dynamic per-token quant for A, static per-tensor quant for B
scale_b = torch.tensor([1.0], device=device, dtype=torch.float32)
b_int8, scale_b_int8, _ = vllm_scaled_int8_quant(b, scale_b)
assert scale_b_int8.numel() == 1
def run_quant():
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a)
return vllm_scaled_mm(
a_int8, b_int8, scale_a_int8, scale_b_int8, dtype
)
elif "tensor-w-tensor-a" in provider:
# Static per-tensor quantization with fixed scales for both A and B
scale_a = torch.tensor([1.0], device=device, dtype=torch.float32)
scale_b = torch.tensor([1.0], device=device, dtype=torch.float32)
b_int8, scale_b_int8, _ = vllm_scaled_int8_quant(b, scale_b)
assert scale_b_int8.numel() == 1
def run_quant():
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a, scale_a)
return vllm_scaled_mm(
a_int8, b_int8, scale_a_int8, scale_b_int8, dtype
)
elif "channel-w-token-a" in provider:
# Dynamic per-channel quant for weights, per-token quant for A
b_int8, scale_b_int8, _ = vllm_scaled_int8_quant(b)
assert scale_b_int8.numel() == N
def run_quant():
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a)
return vllm_scaled_mm(
a_int8, b_int8, scale_a_int8, scale_b_int8, dtype
)
elif "channel-w-tensor-a" in provider:
# Dynamic per-channel quant for weights, static per-tensor quant for A
scale_a = torch.tensor([1.0], device=device, dtype=torch.float32)
b_int8, scale_b_int8, _ = vllm_scaled_int8_quant(b)
assert scale_b_int8.numel() == N
def run_quant():
a_int8, scale_a_int8, _ = vllm_scaled_int8_quant(a, scale_a)
return vllm_scaled_mm(
a_int8, b_int8, scale_a_int8, scale_b_int8, dtype
)
b_int8 = b_int8.t()
else:
cfg = PROVIDER_CFGS[provider]
run_quant = build_int8_runner(cfg, a, b, dtype, device)
ms, min_ms, max_ms = triton.testing.do_bench_cudagraph(
lambda: run_quant(), quantiles=quantiles
)
# Calculate TFLOP/s, two flops per multiply-add
tflops = lambda ms: (2 * M * N * K) * 1e-12 / (ms * 1e-3)
return tflops(ms), tflops(max_ms), tflops(min_ms)
to_tflops = lambda t_ms: (2 * M * N * K) * 1e-12 / (t_ms * 1e-3)
return to_tflops(ms), to_tflops(max_ms), to_tflops(min_ms)
def prepare_shapes(args):
KN_model_names = []
models_tps = list(itertools.product(args.models, args.tp_sizes))
for model, tp_size in models_tps:
assert model in WEIGHT_SHAPES
for KN, tp_split_dim in copy.deepcopy(WEIGHT_SHAPES[model]):
KN[tp_split_dim] = KN[tp_split_dim] // tp_size
for model, tp_size in itertools.product(args.models, args.tp_sizes):
for KN, tp_dim in copy.deepcopy(WEIGHT_SHAPES[model]):
KN[tp_dim] //= tp_size
KN.append(model)
KN_model_names.append(KN)
return KN_model_names
@ -174,7 +144,7 @@ if __name__ == "__main__":
nargs="+",
type=str,
default=["meta-llama/Llama-3.1-8B-Instruct"],
choices=[*WEIGHT_SHAPES.keys()],
choices=list(WEIGHT_SHAPES.keys()),
help="List of models to benchmark",
)
parser.add_argument(
@ -186,9 +156,8 @@ if __name__ == "__main__":
)
args = parser.parse_args()
KN_model_names = prepare_shapes(args)
for K, N, model_name in KN_model_names:
print(f"{model_name}, N={N} K={K}, BF16 vs INT8 GEMMs TFLOP/s:")
for K, N, model in prepare_shapes(args):
print(f"{model}, N={N} K={K}, BF16 vs INT8 GEMMs TFLOP/s:")
benchmark.run(
print_data=True,
show_plots=True,