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https://issues.apache.org/jira/browse/HADOOP-15811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16720083#comment-16720083
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Wei-Chiu Chuang commented on HADOOP-15811:
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According to JDK release notes/docs,
-XX:+UseMontgomerySquareIntrinsic is implemented in 8u102
https://www.oracle.com/technetwork/java/javase/8u102-relnotes-3021767.html
-XX:+UseMontgomeryMultiplyIntrinsic also since 8u102
According to the release note of 8u152, the "BigInteger" performance
improvements are enabled by default, and your options turn them off.
I think we'll have to benchmark different JDK versions since we heavily rely on
JDK for TLS. Waiting for HADOOP-15967 (KMS Benchmark Tool) before working on
this one [~ghuangups] FYI.
> 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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