[jira] [Commented] (CASSANDRA-8150) Revaluate Default JVM tuning parameters

["Donatello (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-8150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17627765#comment-17627765 ] 

Donatello commented on CASSANDRA-8150:
--------------------------------------

Why default GC is not set to G1 (at least), or eventually ZGC or Shenandoah for jvm11 ?
It seems that it perform a lot better than CMS, is simpler to tune, and is usually a recommendation.

> Revaluate Default JVM tuning parameters
> ---------------------------------------
>
>                 Key: CASSANDRA-8150
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8150
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local/Config
>            Reporter: Matt Stump
>            Priority: Normal
>              Labels: remove-reopen
>         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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