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Refine prefill CUDA graph capture sizes #1331

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Merged
shihaobai merged 2 commits into from
Jun 4, 2026
Merged

Refine prefill CUDA graph capture sizes #1331

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af897dd
prefill cudagraph capture size
shihaobai Jun 4, 2026
76ee67b
fix
shihaobai Jun 4, 2026
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20 changes: 13 additions & 7 deletions lightllm/common/basemodel/prefill_cuda_graph.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,15 +30,21 @@ def __init__(self, decode_cuda_graph: CudaGraph, tp_world_size: int):
self.args = get_env_start_args()
self.enable_prefill_microbatch_overlap = self.args.enable_prefill_microbatch_overlap
self.max_handle_token_num = self.args.prefill_cudagraph_max_handle_token

graph_handle_token_nums = []
for i in range(2048):
token_num = int(2 ** (2 * i))
if 1 < token_num < self.max_handle_token_num:
graph_handle_token_nums.append(token_num)
if self.args.batch_max_tokens is not None:
self.max_handle_token_num = min(self.max_handle_token_num, self.args.batch_max_tokens)

graph_handle_token_nums = (
list(range(4, 33, 4))
+ list(range(48, 257, 16))
+ list(range(288, 513, 32))
+ list(range(576, 1024 + 1, 64))
+ list(range(1280, 4096 + 1, 256))
+ list(range(4608, self.max_handle_token_num + 1, 512))
)
graph_handle_token_nums = [e for e in graph_handle_token_nums if e <= self.max_handle_token_num]
graph_handle_token_nums.append(self.max_handle_token_num)

graph_handle_token_nums = list(set(graph_handle_token_nums))
graph_handle_token_nums = list(set[int](graph_handle_token_nums))

@gemini-code-assist gemini-code-assist Bot Jun 4, 2026

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critical

Using set[int](...) at runtime will raise a TypeError: 'types.GenericAlias' object is not callable in Python. Subscription of built-in types like set[...] is only for type annotations and cannot be instantiated directly. Use set(...) instead.

Suggested change
graph_handle_token_nums = list(set[int](graph_handle_token_nums))
graph_handle_token_nums = list(set(graph_handle_token_nums))

graph_handle_token_nums.sort()
if self.args.enable_tpsp_mix_mode:
graph_handle_token_nums = [
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5 changes: 4 additions & 1 deletion lightllm/server/api_cli.py
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Expand Up @@ -567,7 +567,10 @@ def make_argument_parser() -> argparse.ArgumentParser:
" currently only for llama and qwen model, not support ep moe model",
)
parser.add_argument(
"--prefill_cudagraph_max_handle_token", type=int, default=512, help="max handle token num for prefill cudagraph"
"--prefill_cudagraph_max_handle_token",
type=int,
default=8192,
help="max handle token num for prefill cudagraph",
)

parser.add_argument(
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2 changes: 1 addition & 1 deletion lightllm/server/core/objs/start_args_type.py
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Expand Up @@ -126,7 +126,7 @@ class StartArgs:
enable_monitor_auth: bool = field(default=False)
disable_cudagraph: bool = field(default=False)
enable_prefill_cudagraph: bool = field(default=False)
prefill_cudagraph_max_handle_token: int = field(default=512)
prefill_cudagraph_max_handle_token: int = field(default=8192)
graph_max_batch_size: int = field(default=256)
graph_split_batch_size: int = field(default=32)
graph_grow_step_size: int = field(default=16)
Expand Down
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