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Add VLLM_SCHED_PREFILL_KVC_FREEPCT #89

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Add VLLM_SCHED_PREFILL_KVC_FREEPCT #89

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13 changes: 12 additions & 1 deletion vllm/core/scheduler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,9 @@
ARTIFICIAL_PREEMPTION_MAX_CNT = 500


VLLM_SCHED_PREFILL_KVC_FREEPCT = float(
os.getenv("VLLM_SCHED_PREFILL_KVC_FREEPCT", 0.0)) # noqa
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Please move to envs.py


class PreemptionMode(enum.Enum):
"""Preemption modes.

Expand Down Expand Up @@ -644,7 +647,15 @@ def _schedule_prefills(
waiting_queue = deque([s for s in waiting_queue])

leftover_waiting_sequences: Deque[SequenceGroup] = deque()
while self._passed_delay(time.time()) and waiting_queue:
pct_blocks_free = 100.0
#only calculate pct_blocks_free if VLLM_SCHED_PREFILL_KVC_FREEPCT feature is enabled
if VLLM_SCHED_PREFILL_KVC_FREEPCT>0.0:
num_free_blocks = self.block_manager.gpu_allocator.get_num_free_blocks()
total_blocks = self.block_manager.num_total_gpu_blocks
pct_blocks_free = 100*num_free_blocks/total_blocks
#print('>>> Num free blocks',num_free_blocks,'Pct Free',pct_blocks_free,flush=True)

while pct_blocks_free>VLLM_SCHED_PREFILL_KVC_FREEPCT and self._passed_delay(time.time()) and waiting_queue:
seq_group = waiting_queue[0]

waiting_seqs = seq_group.get_seqs(status=SequenceStatus.WAITING)
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