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Fix set kv cache multi-stream #5975

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May 2, 2025
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Fix set kv cache multi-stream #5975

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4 changes: 2 additions & 2 deletions python/sglang/srt/mem_cache/memory_pool.py
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Original file line number Diff line number Diff line change
Expand Up @@ -374,9 +374,9 @@ def set_kv_buffer(
# Overlap the copy of K and V cache for small batch size
current_stream = self.device_module.current_stream()
self.alt_stream.wait_stream(current_stream)
self.k_buffer[layer_id - self.start_layer][loc] = cache_k
with self.device_module.stream(self.alt_stream):
self.k_buffer[layer_id - self.start_layer][loc] = cache_k
self.v_buffer[layer_id - self.start_layer][loc] = cache_v
self.v_buffer[layer_id - self.start_layer][loc] = cache_v
current_stream.wait_stream(self.alt_stream)
else:
self.k_buffer[layer_id - self.start_layer][loc] = cache_k
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