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[RadixTree] Reduce Syscalls, Optimize Collection Filtering and Align with cpp (#12239)

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Signed-off-by: CLFutureX <chenyongqyl@163.com>
This commit is contained in:
PiteXChen
2025-11-10 17:47:59 +08:00
committed by GitHub
parent 05559a4a90
commit e2a784ecda
1 changed files with 10 additions and 12 deletions
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22
python/sglang/srt/mem_cache/radix_cache.py
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@@ -493,16 +493,11 @@ class RadixCache(BasePrefixCache):
while num_evicted < num_tokens and len(eviction_heap):
_priority, x = heapq.heappop(eviction_heap)
if x == self.root_node:
break
if x.lock_ref > 0:
continue
self.token_to_kv_pool_allocator.free(x.value)
num_evicted += len(x.value)
self._delete_leaf(x)
if len(x.parent.children) == 0:
if len(x.parent.children) == 0 and x.parent.lock_ref == 0:
new_priority = self.eviction_strategy.get_priority(x.parent)
heapq.heappush(eviction_heap, (new_priority, x.parent))
@@ -561,14 +556,15 @@ class RadixCache(BasePrefixCache):
##### Internal Helper Functions #####
def _match_prefix_helper(self, node: TreeNode, key: RadixKey):
node.last_access_time = time.monotonic()
access_time = time.monotonic()
node.last_access_time = access_time
child_key = self.get_child_key_fn(key)
value = []
while len(key) > 0 and child_key in node.children.keys():
child = node.children[child_key]
child.last_access_time = time.monotonic()
child.last_access_time = access_time
prefix_len = self.key_match_fn(child.key, key)
if prefix_len < len(child.key):
new_node = self._split_node(child.key, child, prefix_len)
@@ -605,7 +601,8 @@ class RadixCache(BasePrefixCache):
return new_node
def _insert_helper(self, node: TreeNode, key: RadixKey, value):
node.last_access_time = time.monotonic()
access_time = time.monotonic()
node.last_access_time = access_time
if len(key) == 0:
return 0
@@ -614,7 +611,7 @@ class RadixCache(BasePrefixCache):
total_prefix_length = 0
while len(key) > 0 and child_key in node.children.keys():
node = node.children[child_key]
node.last_access_time = time.monotonic()
node.last_access_time = access_time
prefix_len = self.key_match_fn(node.key, key)
total_prefix_length += prefix_len
key = key[prefix_len:]
@@ -676,12 +673,13 @@ class RadixCache(BasePrefixCache):
def _collect_leaves(self):
ret_list = []
stack = [self.root_node]
stack = list(self.root_node.children.values())
while stack:
cur_node = stack.pop()
if len(cur_node.children) == 0:
ret_list.append(cur_node)
if cur_node.lock_ref == 0:
ret_list.append(cur_node)
else:
stack.extend(cur_node.children.values())