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[Attention] Remove max cudagraph size limit of 992 #27840

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Merged
22quinn merged 2 commits into from
Nov 8, 2025
Merged

[Attention] Remove max cudagraph size limit of 992 #27840

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73285db
Remove max cudagraph size limit of 992
22quinn Oct 30, 2025
bc61f1b
Merge branch 'main' into remove-992
22quinn Nov 8, 2025
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7 changes: 0 additions & 7 deletions vllm/v1/attention/backends/flash_attn.py
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Original file line number Diff line number Diff line change
Expand Up @@ -244,13 +244,6 @@ def __init__(
self.max_cudagraph_size = self.compilation_config.max_cudagraph_capture_size

if self.use_full_cuda_graph and self.aot_schedule:
if self.max_cudagraph_size > 992:
# This condition derives from FA3's internal heuristic.
# TODO(woosuk): Support larger cudagraph sizes.
raise ValueError(
"Capture size larger than 992 is not supported for full cuda graph."
)

self.scheduler_metadata = torch.zeros(
vllm_config.scheduler_config.max_num_seqs + 1,
dtype=torch.int32,
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7 changes: 0 additions & 7 deletions vllm/v1/attention/backends/mla/flashattn_mla.py
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Original file line number Diff line number Diff line change
Expand Up @@ -97,13 +97,6 @@ def __init__(
self.max_cudagraph_size = self.compilation_config.max_cudagraph_capture_size

if self.use_full_cuda_graph and self.fa_aot_schedule:
if self.max_cudagraph_size > 992:
# This condition derives from FA3's internal heuristic.
# TODO(woosuk): Support larger cudagraph sizes.
raise ValueError(
"Capture size larger than 992 is not supported for full cuda graph."
)

self.scheduler_metadata = torch.zeros(
vllm_config.scheduler_config.max_num_seqs + 1,
dtype=torch.int32,
Expand Down