[ https://issues.apache.org/jira/browse/CASSANDRA-18027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17632620#comment-17632620 ]
Michael Semb Wever edited comment on CASSANDRA-18027 at 11/12/22 12:12 PM: --------------------------------------------------------------------------- bq. Why not use the JVM default, 200ms? We do, and it works well. >From a wide range of benchmarking synthetic tests and production clusters, >300ms is seen as the best (safe) default. I do not have the data to support >this evidence, it has not remained or is confidential. We saw tuning it away >from 300ms gives very little, and it should not be seen an important flag to >be tuning in any C* cluster. XX:NewSize is a far more important place to >start, often followed by InitiatingHeapOccupancyPercent. was (Author: michaelsembwever): bq. Why not use the JVM default, 200ms? We do, and it works well. >From a wide range of benchmarking synthetic tests and production clusters, >300ms is seen as the best (safe) default. I do not have the data to support >this evidence, it was not collected or is confidential. We saw tuning it away >from 300ms gives very little, and it should not be seen an important flag to >be tuning in any C* cluster. XX:NewSize is a far more important place to >start, often followed by InitiatingHeapOccupancyPercent. > Use G1GC as default > ------------------- > > Key: CASSANDRA-18027 > URL: https://issues.apache.org/jira/browse/CASSANDRA-18027 > Project: Cassandra > Issue Type: Task > Components: Local/Config > Reporter: Michael Semb Wever > Assignee: Michael Semb Wever > Priority: Normal > > G1GC is well battle tested now, and the recommended configuration for most > users. CMS can work well on smaller heaps but requires more tuning, initially > and over time. G1GC just works. CMS was deprecated in JDK 9. > Patch at > https://github.com/apache/cassandra/compare/trunk...thelastpickle:cassandra:mck/7486/trunk -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org