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Posted to commits@cloudstack.apache.org by GitBox <gi...@apache.org> on 2020/10/15 08:11:39 UTC

[GitHub] [cloudstack] sureshanaparti commented on pull request #4407: packaging: enable Parallel Collector GC for management server

sureshanaparti commented on pull request #4407:
URL: https://github.com/apache/cloudstack/pull/4407#issuecomment-708980393


   @rhtyd Good to see change in the GC for management server process. Even though Parallel GC is the fastest, there are some side effects of using Parallel GC.
   
   - Parallel GC is the default GC in Java 8, which is changed to G1 from Java 9 [1], due to higher GC pauses.
   - All application threads are stopped during GC, can impact response time / latency. Check some use cases for Parallel GC here [2].
   
   [1] http://openjdk.java.net/jeps/248
   [2] https://www.informit.com/articles/article.aspx?p=2496621&seqNum=2
   
   I think, it is better to control such pause times using option "-XX:MaxGCPauseMillis", when we opt for Parallel GC.


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