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Fix OOM by offloading multimodal features to CPU after embedding #16018

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Merged
hnyls2002 merged 3 commits into from
Dec 31, 2025
Merged

Fix OOM by offloading multimodal features to CPU after embedding #16018

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Fix OOM by offloading multimodal features to CPU after embedding
liusy58 Dec 28, 2025
b67b708
Merge branch 'main' into oom
liusy58 Dec 29, 2025
90ce745
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liusy58 Dec 31, 2025
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7 changes: 7 additions & 0 deletions python/sglang/srt/managers/mm_utils.py
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Expand Up @@ -1079,6 +1079,13 @@ def general_mm_embed_routine(
kwargs["input_deepstack_embeds"] = other_info["input_deepstack_embeds"]
# once used, mm_inputs is useless, considering chunked-prefill is disabled for multimodal models
# just being defensive here
if mm_inputs_list:
for mm_input_obj in mm_inputs_list:
if mm_input_obj and hasattr(mm_input_obj, "mm_items"):
for mm_item in mm_input_obj.mm_items:
feature = getattr(mm_item, "feature", None)
if isinstance(feature, torch.Tensor) and feature.is_cuda:
mm_item.feature = feature.to("cpu", non_blocking=True)
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forward_batch.mm_inputs = None
else:
input_embeds = embed_tokens(input_ids)
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