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https://issues.apache.org/jira/browse/SPARK-21688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121599#comment-16121599
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Sean Owen commented on SPARK-21688:
-----------------------------------

I mean best case in that MKL might be a little different from OpenBLAS but this 
is minor. 

I suppose this won't impact users with no acceleration. 
What is the slowdown for those who use default thread settings? Because that's 
the most common scenario. If it's non trivial we can't just ignore it. 

> performance improvement in mllib SVM with native BLAS 
> ------------------------------------------------------
>
>                 Key: SPARK-21688
>                 URL: https://issues.apache.org/jira/browse/SPARK-21688
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>    Affects Versions: 2.2.0
>         Environment: 4 nodes: 1 master node, 3 worker nodes
> model name      : Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz
> Memory : 180G
> num of core per node: 10
>            Reporter: Vincent
>         Attachments: ddot unitest.png, mllib svm training.png, 
> native-trywait.png, svm1.png, svm2.png, svm-mkl-1.png, svm-mkl-2.png
>
>
> in current mllib SVM implementation, we found that the CPU is not fully 
> utilized, one reason is that f2j blas is set to be used in the HingeGradient 
> computation. As we found out earlier 
> (https://issues.apache.org/jira/browse/SPARK-21305) that with proper 
> settings, native blas is generally better than f2j on the uni-test level, 
> here we make the blas operations in SVM go with MKL blas and get an end to 
> end performance report showing that in most cases native blas outperformance 
> f2j blas up to 50%.
> So, we suggest removing those f2j-fixed calling and going for native blas if 
> available. If this proposal is acceptable, we will move on to benchmark other 
> algorithms impacted. 



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