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[V1][BugFix] Fix edge case in VLM scheduling (#12065)

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Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
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Woosuk Kwon 2025-01-14 20:21:28 -08:00 committed by GitHub
parent 9ddac56311
commit b7ee940a82
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1 changed files with 15 additions and 11 deletions
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vllm/v1/core/scheduler.py
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@ -373,18 +373,22 @@ class Scheduler:
if self.encoder_cache_manager.has_cache(request, i):
# The encoder input is already computed and cached.
continue
if not self.encoder_cache_manager.can_allocate(request, i):
# The encoder cache is full. We can only schedule the decoder
# tokens just before the encoder input.
num_new_tokens = start_pos - num_computed_tokens
break
if num_encoder_tokens > encoder_budget:
# The encoder budget is exhausted. We can only schedule the
# decoder tokens up until the encoder input.
# NOTE(woosuk): We assume that the encoder tokens should be
# processed altogether, as the encoder usually uses
if (not self.encoder_cache_manager.can_allocate(request, i)
or num_encoder_tokens > encoder_budget):
# The encoder cache is full or the encoder budget is exhausted.
# NOTE(woosuk): We assume that the encoder input tokens should
# be processed altogether, as the encoder usually uses
# bidirectional attention.
num_new_tokens = start_pos - num_computed_tokens
if num_computed_tokens < start_pos:
# We only schedule the decoder tokens just before the
# encoder input.
num_new_tokens = start_pos - num_computed_tokens
else:
# Because of prefix caching, num_computed_tokens is greater
# than start_pos even though its encoder input is not
# available. In this case, we can't schedule any token for
# the request in this step.
num_new_tokens = 0
break
encoder_budget -= num_encoder_tokens