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[D] Need advise with pytorch distributed setup worse then single gpu

Model is tacotron2 based on this repo.

So, I made it work with Pytorch DDP, and it works, but the gap between single and distributed train seems to me too large.

Loss single GPU vs 8 GPU

So, single GPU loss much better, stable and 8 GPUs give only x2 time gain with x8 costs.

Do I miss something obvious?

Maybe because of batchnorm? Tried sync batch norm, but it does not really make a difference.

submitted by /u/hadaev
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Toronto AI is a social and collaborative hub to unite AI innovators of Toronto and surrounding areas. We explore AI technologies in digital art and music, healthcare, marketing, fintech, vr, robotics and more. Toronto AI was founded by Dave MacDonald and Patrick O'Mara.