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[Bugfix] lookahead block table with cuda graph max capture (#8340)

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[Bugfix] Ensure multistep lookahead allocation is compatible with cuda graph max capture (#8340)
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Alexander Matveev 2024-09-10 19:00:35 -04:00 committed by GitHub
parent b1f3e18958
commit 22f3a4bc6c
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1 changed files with 11 additions and 1 deletions
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12
vllm/attention/backends/flash_attn.py
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@ -471,9 +471,19 @@ class FlashAttentionMetadataBuilder(
# The shape of graph_block_tables is
# [max batch size, max context len // block size].
input_block_tables = self.runner.graph_block_tables[:batch_size]
max_blocks = input_block_tables.shape[1]
for i, block_table in enumerate(self.block_tables):
if block_table:
input_block_tables[i, :len(block_table)] = block_table
num_blocks = len(block_table)
if num_blocks <= max_blocks:
input_block_tables[i, :num_blocks] = block_table
else:
# It may be possible to have more blocks allocated due
# to lookahead slots of multi-step, however, they are
# not used anyway, so can be safely ignored.
input_block_tables[
i, :max_blocks] = block_table[:max_blocks]
block_tables = torch.from_numpy(input_block_tables).to(
device=device, non_blocking=True)
else: