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

["Timothy Bish (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AMQ-6492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Timothy Bish closed AMQ-6492.
-----------------------------
    Resolution: Not A Problem

master branch uses latest Camel

> 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
>         Attachments: screenshot-1.png, screenshot-2.png, screenshot-3.png
>
>
> 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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