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[KV Sharing] Raise error if using eagle with fast prefill (#24350)

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Signed-off-by: Yong Hoon Shin <yhshin@meta.com>
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Yong Hoon Shin 2025-09-05 20:22:40 -07:00 committed by GitHub
parent 35bf193864
commit 3c529fc994
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GPG Key ID: B5690EEEBB952194
2 changed files with 18 additions and 7 deletions
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18
vllm/config/__init__.py
View File

@ -3665,6 +3665,24 @@ class VllmConfig:
" Disabling `torch.compile`.")
self.compilation_config.level = CompilationLevel.NO_COMPILATION
if self.cache_config.kv_sharing_fast_prefill:
if not envs.VLLM_USE_V1:
raise NotImplementedError(
"Fast prefill optimization for KV sharing is not supported "
"in V0 currently.")
if self.speculative_config is not None and \
self.speculative_config.use_eagle():
raise NotImplementedError(
"Fast prefill optimization for KV sharing is not "
"compatible with EAGLE as EAGLE requires correct logits "
"for all tokens while fast prefill gives incorrect logits "
"for prompt tokens.")
logger.warning_once(
"--kv-sharing-fast-prefill requires changes on model side for "
"correctness and to realize prefill savings. ")
if ((not envs.VLLM_USE_V1) and self.lora_config is not None
and self.compilation_config.level
!= CompilationLevel.NO_COMPILATION):

7
vllm/config/cache.py
View File

@ -145,19 +145,12 @@ class CacheConfig:
self._verify_cache_dtype()
self._verify_prefix_caching()
self._verify_kv_sharing_fast_prefill()
def metrics_info(self):
# convert cache_config to dict(key: str, value: str) for prometheus
# metrics info
return {key: str(value) for key, value in self.__dict__.items()}
def _verify_kv_sharing_fast_prefill(self) -> None:
if self.kv_sharing_fast_prefill and not envs.VLLM_USE_V1:
raise NotImplementedError(
"Fast prefill optimization for KV sharing is not supported "
"in V0 currently.")
@model_validator(mode='after')
def _verify_args(self) -> Self:
if self.cpu_offload_gb < 0: