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Posted to dev@mxnet.apache.org by "Zheng, Da" <dz...@amazon.com.INVALID> on 2018/11/28 05:55:11 UTC

Significant performance regression in SpMV

Hello all,

I notice there is a significant performance regression in SpMV after this PR (https://github.com/apache/incubator-mxnet/pull/12380). It seems the problem occurs when running on multiple GPUs (e.g., 8 GPUs). When running multiple GPUs for training, SpMV on CPU only uses two or three threads for computation. It seems to me that this is a serious bug. Can the bug be fixed in release 1.4?

Thanks,
Da

Re: Significant performance regression in SpMV

Posted by "Zai, Alexander" <al...@amazon.com.INVALID>.

Can you create an issue for this with codesnippet we can run?

Alex

On 11/27/18, 9:55 PM, "Zheng, Da" <dz...@amazon.com.INVALID> wrote:

    Hello all,
    
    I notice there is a significant performance regression in SpMV after this PR (https://github.com/apache/incubator-mxnet/pull/12380). It seems the problem occurs when running on multiple GPUs (e.g., 8 GPUs). When running multiple GPUs for training, SpMV on CPU only uses two or three threads for computation. It seems to me that this is a serious bug. Can the bug be fixed in release 1.4?
    
    Thanks,
    Da