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https://issues.apache.org/jira/browse/SOLR-13394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16836430#comment-16836430
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Shawn Heisey commented on SOLR-13394:
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Regarding the -XX:+PerfDisableSharedMem parameter: This is another case of
things from my GC experiments creeping into other places.
On systems with lots of disk writes, that parameter can lead to real
performance gains.
It does stop a lot of commandline Java tools from working, though ... because
those tools gather their information from the target JVM through the shared
memory interface and don't have any other way to do it. A prime example is
jstat.
My GC tuning wiki page at [https://wiki.apache.org/solr/ShawnHeisey] references
a fascinating blog post: [http://www.evanjones.ca/jvm-mmap-pause.html]
For the general case, I think that parameter can really help performance ...
but some users will be seriously hampered by the lack of working Java
commandline tools. Whether or not we leave it in by default, some
documentation is a good idea.
> 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, 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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