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[2/3] Optimize Slime Update Weights: Avoid GPU-to-CPU Device Sync when update expert weights #8753

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Merged
ch-wan merged 2 commits into from
Aug 6, 2025
+5 −1
Merged

[2/3] Optimize Slime Update Weights: Avoid GPU-to-CPU Device Sync when update expert weights #8753

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531368e
Avoid GPU-to-CPU Device Sync when update expert weights
hebiao064 Aug 4, 2025
3323503
avoid eplb
hebiao064 Aug 4, 2025
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7 changes: 6 additions & 1 deletion python/sglang/srt/eplb/expert_location.py
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Original file line number Diff line number Diff line change
Expand Up @@ -270,9 +270,14 @@ def update(
def logical_to_all_physical(
self, layer_id: int, logical_expert_id: int
) -> List[int]:
# Use CPU copy to avoid GPU→CPU sync on every call, which is expensive in update weights scenario
if not hasattr(self, "_logical_to_all_physical_map_cpu"):
self._logical_to_all_physical_map_cpu = (
self.logical_to_all_physical_map.cpu()
)
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return [
physical_expert_id
for physical_expert_id in self.logical_to_all_physical_map[
for physical_expert_id in self._logical_to_all_physical_map_cpu[
layer_id, logical_expert_id
].tolist()
if physical_expert_id != -1
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