[jira] [Created] (SOLR-9301) Consider removing ConcGCThreads and ParallelGCThreads from default tuning parameters

["Varun Thacker (JIRA)" <ji...@apache.org>]

Varun Thacker created SOLR-9301:
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             Summary: Consider removing ConcGCThreads and ParallelGCThreads from default tuning parameters
                 Key: SOLR-9301
                 URL: https://issues.apache.org/jira/browse/SOLR-9301
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Varun Thacker
            Priority: Minor


Currently in our bin scripts we set default values for these two parameters  
{{-XX:ConcGCThreads=4 -XX:ParallelGCThreads=4}}

Given that the JVM can smartly choose the default values based on the number of processors should we still be overriding the defaults?

http://www.oracle.com/technetwork/articles/java/g1gc-1984535.html

For beefier machines this could be significantly slow down the collection times.

Will it have a negative effect for smaller machines?

Any other downsides to removing this that I might be overlooking?






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