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Wei-Chiu Chuang commented on HADOOP-15811: ------------------------------------------ Hmm. on 8u181, I am not seeing much different after applying the configs. > 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org