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[v0.11.0][Fix] Cap max tokens to prevent potential OOM (#3720) (#3744)

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### What this PR does / why we need it?
Caps the calculated maximum number of tokens at 512.

This prevents allocating an excessively large buffer when a cudagraph
capture size is not specified, mitigating the risk of out-of-memory
errors.

### Does this PR introduce _any_ user-facing change?
None.

### How was this patch tested?
None.

Signed-off-by: Yizhou Liu <liu_yizhou@outlook.com>
This commit is contained in:
Yizhou
2025-10-25 15:46:56 +08:00
committed by GitHub
parent 99e154dc84
commit 1bc61031e5
1 changed files with 3 additions and 1 deletions
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4
vllm_ascend/worker/model_runner_v1.py
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@@ -543,7 +543,9 @@ class NPUModelRunner(LoRAModelRunnerMixin):
if self.compilation_config.cudagraph_capture_sizes:
max_num_tokens = self.compilation_config.cudagraph_capture_sizes[0]
else:
max_num_tokens = self.max_num_reqs * self.uniform_decode_query_len
# NOTE: To save memory, we cap the max number of tokens to 512.
max_num_tokens = min(
self.max_num_reqs * self.uniform_decode_query_len, 512)
tp_size = self.parallel_config.tensor_parallel_size
# Use integer arithmetic for ceiling division.
num_tokens_per_tp_rank = (max_num_tokens + tp_size - 1) // tp_size