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https://issues.apache.org/jira/browse/CASSANDRA-8150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14572582#comment-14572582
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Jeremy Hanna commented on CASSANDRA-8150:
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>From conversations with [~mstump] and [[email protected]] about these
>settings, the only settings that are generally applicable are:
JVM_OPTS="$JVM_OPTS -XX:+PerfDisableSharedMem"
JVM_OPTS="$JVM_OPTS -XX:-UseBiasedLocking"
All other settings need to be tuned using A|B testing one at a time and
specific to the environment and use case.
It was also noted that 8G heap and 2G newsize was a good general starting point.
> Revaluate Default JVM tuning parameters
> ---------------------------------------
>
> Key: CASSANDRA-8150
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8150
> Project: Cassandra
> Issue Type: Improvement
> Components: Config
> Reporter: Matt Stump
> Assignee: Ryan McGuire
> Attachments: upload.png
>
>
> It's been found that the old twitter recommendations of 100m per core up to
> 800m is harmful and should no longer be used.
> Instead the formula used should be 1/3 or 1/4 max heap with a max of 2G. 1/3
> or 1/4 is debatable and I'm open to suggestions. If I were to hazard a guess
> 1/3 is probably better for releases greater than 2.1.
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