[jira] [Created] (AMQ-6492) concurrentlinkedhashmap used by LRU cache consumes 100MB memory on 1024 core Solaris T5

["Matt Baker (JIRA)" <ji...@apache.org>]

Matt Baker created AMQ-6492:
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             Summary: concurrentlinkedhashmap used by LRU cache consumes 100MB memory on 1024 core Solaris T5
                 Key: AMQ-6492
                 URL: https://issues.apache.org/jira/browse/AMQ-6492
             Project: ActiveMQ
          Issue Type: Bug
          Components: activemq-camel
    Affects Versions: 5.14.1
         Environment: Solaris T5 with 1024 core 
java 1.7.045
            Reporter: Matt Baker


A basic setup of activemq-all.jar setup on a high CPU count machine ends up consuming 100's of MB due to the poor memory allocation used by the ConcurrentLinkedHashMap implementation that is being used by LRU Cache.

The ConcurrentLinkedHashMap  allocates concurrency for its lock table based on the number of CPUs with no upper limit.  Apache Camel uses multiple copies of LRUCache each of which consume ~20MB of memory.  Due to this my install ends up consuming almost 400MB of memory.

Will post screenshot from yourkit.

Have logged this with owner of this code.

https://github.com/ben-manes/concurrentlinkedhashmap/issues/49



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