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https://issues.apache.org/jira/browse/SOLR-13394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16829606#comment-16829606
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Shawn Heisey commented on SOLR-13394:
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bq. The default region size is very large at 16MB. G1GC recommends ~2048
regions which would make this setting appropriate only for 32GB heaps or more.
Can we remove this explicit setting and let G1 choose the default.
I would be curious about whether the latest Java 8 does what Oracle engineers
promised with regard to better handling of humongous allocations.
An index with 125 million documents will have filterCache entries that are
about 15MB each. In order for those to not be considered humongous
allocations, the region size must be set to its maximum -- 32MB.
I wonder if we need some minimal documentation about GC tuning, that at least
mentions the region size parameter.
> Change default GC from CMS to G1
> --------------------------------
>
> Key: SOLR-13394
> URL: https://issues.apache.org/jira/browse/SOLR-13394
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Ishan Chattopadhyaya
> Assignee: Ishan Chattopadhyaya
> Priority: Major
> Fix For: 8.1
>
> Attachments: SOLR-13394.patch
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> CMS has been deprecated in new versions of Java
> (http://openjdk.java.net/jeps/291). This issue is to switch Solr default from
> CMS to G1.
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