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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15811) Optimizations for Java's TLS performance
Date Thu, 11 Oct 2018 16:10:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16646694#comment-16646694
] 

Wei-Chiu Chuang commented on HADOOP-15811:
------------------------------------------

I would like to pick this up – will probably work on this starting next week.

> Optimizations for Java's TLS performance
> ----------------------------------------
>
>                 Key: HADOOP-15811
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15811
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: common
>    Affects Versions: 1.0.0
>            Reporter: Daryn Sharp
>            Priority: Major
>
> Java defaults to using /dev/random and disables intrinsic methods used in hot code paths.
 Both cause highly synchronized impls to be used that significantly degrade performance.
> * -Djava.security.egd=file:/dev/urandom
> * -XX:+UseMontgomerySquareIntrinsic
> * -XX:+UseMontgomeryMultiplyIntrinsic
> * -XX:+UseSquareToLenIntrinsic
> * -XX:+UseMultiplyToLenIntrinsic
> These settings significantly boost KMS server performance.  Under load, threads are not
jammed in the SSLEngine.



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