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From abhijith <>
Subject Artems: ParallelGC vs CMS
Date Tue, 07 Feb 2017 18:53:00 GMT

Has there any test done for Artemis using CMS GC?  

Context:  We were using default parallel GC with 6G RAM and were facing an
issue where old gen was filling up without full GC being run.  We use Netty
Transport configuration and have one master/slave setup with static
configuration.  Our monitoring alerts for total memory usage were firing. 
So we ran some tests and found that old gen was growing very slowly in case
of CMS, but very rapidly in case of parallel GC.

We switched to using CMS, but after changing to CMS we started seeing
connection errors when session factory is trying to create a new connection. 
This was happening consistently which forced us to roll back.  After
rollback with parallel gc we do not see this issue at all.  We are kind of
confused on how selection of GC can affect creating new connections.  Any
insight would be really helpful.

GG parameters:  "-XX:+UseFastAccessorMethods -Xms8G -Xmx8G
-XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode
-XX:CMSIncrementalDutyCycleMin=10 -XX:CMSIncrementalDutyCycle=20
-XX:+CMSIncrementalPacing -XX:+CMSClassUnloadingEnabled "

Caused by:
AMQ119024: Could not select a TransportConfiguration to create
        ... 122 common frames omitted


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