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Posted to issues@spark.apache.org by "WuZeyi (Jira)" <ji...@apache.org> on 2019/11/19 08:27:00 UTC
[jira] [Comment Edited] (SPARK-29553) This problemis about using
native BLAS to improvement ML/MLLIB performance
[ https://issues.apache.org/jira/browse/SPARK-29553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16977236#comment-16977236 ]
WuZeyi edited comment on SPARK-29553 at 11/19/19 8:26 AM:
----------------------------------------------------------
Thanks for Looking.
I modify spark-env.sh,and the flame graph is like this:
!image-2019-11-19-16-11-43-130.png!
Then I modify {color:#172b4d}spark.conf, and the flame graph is this:{color}
{color:#172b4d}!image-2019-11-19-16-13-30-723.png!{color}
It means that it is still multi-thread if I modify spark-env.sh.
If I modify spark.conf to set {color:#ff0000}spark.executorEnv.OPENBLAS_NUM_THREADS=1{color}，it works and the the performance improve.
IMHO, spark-env.sh only set the evn of the spark-sumbit process, but it doesn't work in the executor processes.
was (Author: zeyiii):
Thanks for Looking.
I modify spark-env.sh,and the flame graph is like this:
!image-2019-11-19-16-11-43-130.png!
Then I modify {color:#172b4d}spark.conf, and the flame graph is this:{color}
{color:#172b4d}!image-2019-11-19-16-13-30-723.png!{color}
It means that it is still multi-thread if I modify spark-env.sh.
If I modify spark.conf to set {color:#ff0000}spark.executorEnv.OPENBLAS_NUM_THREADS=1{color}，it works and the the performance improve.
IMHO, spark-env,sh only set the evn of the spark-sumbit process, but it doesn't work in the executor processes.
> This problemis about using native BLAS to improvement ML/MLLIB performance
> --------------------------------------------------------------------------
>
> Key: SPARK-29553
> URL: https://issues.apache.org/jira/browse/SPARK-29553
> Project: Spark
> Issue Type: Improvement
> Components: ML, MLlib
> Affects Versions: 2.3.0, 2.4.4
> Reporter: WuZeyi
> Priority: Minor
> Labels: performance
> Attachments: image-2019-11-19-16-11-43-130.png, image-2019-11-19-16-13-30-723.png
>
>
> I use {color:#ff0000}native BLAS{color} to improvement ML/MLLIB performance on Yarn.
> The file {color:#ff0000}spark-env.sh{color} which is modified by SPARK-21305 said that I should set {color:#ff0000}OPENBLAS_NUM_THREADS=1{color} to disable multi-threading of OpenBLAS, but it does not take effect.
> I modify {color:#ff0000}spark.conf{color} to set {color:#FF0000}spark.executorEnv.OPENBLAS_NUM_THREADS=1{color}，and the performance improve.
>
>
> I think MKL_NUM_THREADS is the same.
>
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