[Unified Checkpoint] update merge tensor parallel#8856
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ZHUI
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| ret = distributed_allgather(tensor, group=tp_group, offload=False) | ||
| # Get tensor size | ||
| tensor_bytes = tensor.numel().item() * dtype_byte_size(tensor.dtype) * tp_group.nranks | ||
| if tensor_bytes >= 5368709120: # temporarily set 5GB as threshold |
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No Magic Number。 tensor_bytes > 5*1024*1024*1024
建议再设置小一点。
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## develop #8856 +/- ##
===========================================
- Coverage 55.43% 55.42% -0.02%
===========================================
Files 631 631
Lines 98544 98577 +33
===========================================
+ Hits 54632 54633 +1
- Misses 43912 43944 +32 ☔ View full report in Codecov by Sentry. |
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Description
When merging large tensors, there may be not enough GPU memory to allocate due to VRAM fragmentation. Therefore we split the large tensors into smaller parts, and then merge these tensors on CPU.