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feature(pd-hicache): Prefill instances support reusing the RemoteStorage Cache via HiCache. (#8516)

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Co-authored-by: Shangming Cai <csmthu@gmail.com>
Co-authored-by: Zhiqiang Xie <xiezhq@stanford.edu>
This commit is contained in:
hzh0425
2025-07-30 12:19:25 +08:00
committed by GitHub
parent a85ebf50b8
commit 2fbb754e1d
1 changed files with 14 additions and 9 deletions
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23
python/sglang/srt/managers/scheduler.py
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@@ -1185,23 +1185,28 @@ class Scheduler(
def _add_request_to_queue(self, req: Req):
req.queue_time_start = time.perf_counter()
if self.disaggregation_mode == DisaggregationMode.PREFILL:
self._prefetch_kvcache(req)
self.disagg_prefill_bootstrap_queue.add(
req, self.model_config.num_key_value_heads
)
elif self.disaggregation_mode == DisaggregationMode.DECODE:
self.disagg_decode_prealloc_queue.add(req)
else:
if self.enable_hicache_storage:
req.init_next_round_input(self.tree_cache)
last_hash = req.last_host_node.get_last_hash_value()
matched_len = len(req.prefix_indices) + req.host_hit_length
if (matched_len > 0 and last_hash is not None) or matched_len == 0:
new_input_tokens = req.fill_ids[matched_len:]
self.tree_cache.prefetch_from_storage(
req.rid, req.last_host_node, new_input_tokens, last_hash
)
self._prefetch_kvcache(req)
self.waiting_queue.append(req)
def _prefetch_kvcache(self, req: Req):
if self.enable_hicache_storage:
req.init_next_round_input(self.tree_cache)
last_hash = req.last_host_node.get_last_hash_value()
matched_len = len(req.prefix_indices) + req.host_hit_length
# todo, free-form fetching, calculating hash keys on the fly
if (matched_len > 0 and last_hash is not None) or matched_len == 0:
new_input_tokens = req.fill_ids[matched_len:]
self.tree_cache.prefetch_from_storage(
req.rid, req.last_host_node, new_input_tokens, last_hash
)
def _extend_requests_to_queue(self, reqs: List[Req], is_retracted: bool = False):
if self.disaggregation_mode == DisaggregationMode.PREFILL:
self.disagg_prefill_bootstrap_queue.extend(