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Posted to issues@activemq.apache.org by "Francesco Nigro (JIRA)" <ji...@apache.org> on 2017/01/02 14:48:58 UTC

[jira] [Created] (ARTEMIS-905) JCtools ConcurrentMap replacement

Francesco Nigro created ARTEMIS-905:
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             Summary: JCtools ConcurrentMap replacement
                 Key: ARTEMIS-905
                 URL: https://issues.apache.org/jira/browse/ARTEMIS-905
             Project: ActiveMQ Artemis
          Issue Type: Improvement
            Reporter: Francesco Nigro


The OSS project JCTools (already used in Netty core) provides primitive (long) and normal implementations of ConcurrentMap with better scalability, lower memory footprint (garbage collector wise too) and equals to better performances than the vanilla's ConcurrentHashMap.
It worth to replace every ConcurrentHashMap usage with the JCtools version.
[Here|http://www.azulsystems.com/blog/cliff/2007-03-26-non-blocking-hashtable] there is an old but valid overview of the map and on JCtools are provided [JMH benchmarks|https://github.com/JCTools/JCTools/blob/master/jctools-benchmarks/src/main/java/org/jctools/maps/nhbm_test/jmh/ConcurrentMapThroughput.java] to evaluate the performance of the implementation.



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