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[Bug fix] Fix prefix cache in v1 (#3710)

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* [Bug fix] Fix prefix cache in V1

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This commit is contained in:
chenjian
2025-09-01 10:14:25 +08:00
committed by GitHub
parent 10a95f8ed5
commit a424ab907f
2 changed files with 76 additions and 9 deletions
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28
fastdeploy/engine/sched/resource_manager_v1.py
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@@ -117,8 +117,8 @@ class ResourceManagerV1(ResourceManager):
preempted_req = self.running.pop()
preempted_req.status = RequestStatus.PREEMPTED
preempted_req.num_computed_tokens = 0
preempted_req.prefill_block_num = 0
self._free_blocks(preempted_req)
preempted_req.prefill_block_num = None
self.to_be_rescheduled_request_id_set.add(preempted_req.request_id)
preempted_reqs.append(preempted_req)
scheduled_reqs.append(self._prepare_preempt_task(preempted_req))
@@ -305,6 +305,7 @@ class ResourceManagerV1(ResourceManager):
if self.config.cache_config.enable_prefix_caching:
success = self.get_prefix_cached_blocks(request)
if not success:
self._free_blocks(request)
break
num_new_tokens = self._get_num_new_tokens(request, token_budget)
@@ -327,16 +328,24 @@ class ResourceManagerV1(ResourceManager):
self.stop_flags[allocated_position] = False
self.req_dict[request.request_id] = allocated_position
else:
if self.config.cache_config.enable_prefix_caching:
self._free_blocks(request)
break
elif request.status == RequestStatus.PREEMPTED:
request.need_prefill_tokens = (
request.num_total_tokens
) # Before preempted task rescheduled, preempted task has been sent to engine, no more tokens are output, here num_total_tokens should be static and correct
if self.config.cache_config.enable_prefix_caching:
success = self.get_prefix_cached_blocks(request)
if not success:
self._free_blocks(request)
break
num_new_tokens = self._get_num_new_tokens(request, token_budget)
num_new_block = self.get_new_block_nums(request, num_new_tokens)
# Allocate blocks to prefill
if self.cache_manager.can_allocate_gpu_blocks(num_new_block):
request.block_tables.extend(self.cache_manager.allocate_gpu_blocks(num_new_block))
if not request.get("skip_allocate", False):
request.block_tables.extend(self.cache_manager.allocate_gpu_blocks(num_new_block))
self.waiting.popleft()
self.running.append(request)
scheduled_reqs.append(self._prepare_prefill_task(request, num_new_tokens))
@@ -344,6 +353,8 @@ class ResourceManagerV1(ResourceManager):
request.num_computed_tokens += num_new_tokens
request.status = RequestStatus.RUNNING
else:
if self.config.cache_config.enable_prefix_caching:
self._free_blocks(request)
break
else:
llm_logger.error("Unknown request status type")
@@ -399,7 +410,7 @@ class ResourceManagerV1(ResourceManager):
main_process_metrics.prefix_cpu_cache_token_num.inc(request.cpu_cache_token_num)
if matched_token_num == request.prompt_token_ids_len:
request.num_computed_tokens = matched_token_num - 1
request.num_computed_tokens = matched_token_num - self.config.cache_config.block_size
request.skip_allocate = True
else:
request.num_computed_tokens = matched_token_num
@@ -417,8 +428,15 @@ class ResourceManagerV1(ResourceManager):
def _free_blocks(self, request: Request):
if self.config.cache_config.enable_prefix_caching:
# TODO(chengyanfu): support cache ouput blocks for prefix caching
self.cache_manager.release_block_ids_async(request)
self.cache_manager.recycle_gpu_blocks(request.block_tables[request.prefill_block_num :])
if request.get("prefill_block_num", None) is None:
leaf_node = self.cache_manager.req_leaf_map[request.request_id]
self.cache_manager.decrease_request_share_count(request.request_id)
self.cache_manager.free_nodes_directly(leaf_node)
self.cache_manager.recycle_gpu_blocks(request.block_tables[request.cache_info[0]:])
else:
self.cache_manager.release_block_ids_async(request)
self.cache_manager.recycle_gpu_blocks(request.block_tables[request.prefill_block_num :])
else:
self.cache_manager.recycle_gpu_blocks(request.block_tables)
request.block_tables = []