zero3 performance optimizations #3622
Merged
Commits on May 22, 2023
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Prevent evaluation of debug strings
Debug strings are evaluated even when logging is disabled
Commits on May 29, 2023
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Use contiguous gradients tensor reduce scatter between ranks
Use allreduce instead of reduce scatter. lower cpu overhead.
Commits on May 30, 2023
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move overflow tracker to optimizer.step
Don't check overflow in gradients for every bucket. Do overflow chack once on grad flat buffer just before optimizer step
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Commits on Jun 1, 2023
Commits on Jun 5, 2023
Commits on Jun 7, 2023
Commits on Jun 8, 2023
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