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[pure dp performance] Optimize fused allreduce in raw program #34509

Merged
merged 5 commits into from
Aug 11, 2021
Merged

[pure dp performance] Optimize fused allreduce in raw program #34509

merged 5 commits into from
Aug 11, 2021

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FeixLiu
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@FeixLiu FeixLiu commented Jul 30, 2021 •
edited by wangxicoding
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PR types

Performance optimization

PR changes

Others

Describe

  1. Increase the overlap of the calc stream and comm stream after fusing the allreduce vars.
  2. Move the coalesce_tensor before grad generation, so that the copy_data is not needed.

Test

GPT model with dp=8

Without Fuse With Fuse Gain
FP32 68889 tokens/s 70822 tokens/s +2.3%
AMP 123968 tokens/s 133408 tokens/s +7.6%

FP32 Loss curve
Screen Shot 2021-08-03 at 6 46 32 PM
Max Diff: 0.038

FP16 Loss curve
Screen Shot 2021-08-03 at 7 05 15 PM
Max Diff: 0.073

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Please wait for the result of CI firstly. See Paddle CI Manual for details.

@FeixLiu FeixLiu force-pushed the allreduce_optim branch 2 times, most recently from c54345a to ed8f7eb Compare August 3, 2021 05:19
@FeixLiu FeixLiu force-pushed the allreduce_optim branch 6 times, most recently from bd8cf8f to 6c8b8ab Compare August 3, 2021 10:23
@FeixLiu FeixLiu force-pushed the allreduce_optim branch 2 times, most recently from fce35ac to fc3458f Compare August 5, 2021 01:40
@FeixLiu FeixLiu force-pushed the allreduce_optim branch 2 times, most recently from c82093f to 11928ea Compare August 10, 2021 06:49
wangxicoding
wangxicoding approved these changes Aug 11, 2021
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LGTM

@wangxicoding wangxicoding changed the title Allreduce optim Optimize fused allreduce in raw program Aug 11, 2021
@wangxicoding wangxicoding merged commit 4d2994c into PaddlePaddle:develop Aug 11, 2021
@FeixLiu FeixLiu deleted the allreduce_optim branch August 11, 2021 06:29
@FeixLiu FeixLiu changed the title Optimize fused allreduce in raw program [pure dp performance] Optimize fused allreduce in raw program Oct 11, 2021
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@wangxicoding wangxicoding wangxicoding approved these changes

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@FeixLiu @wangxicoding