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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ARTEMIS-1807) File-based Large Message encoding should use read-only mmap
Date Mon, 16 Apr 2018 16:37:00 GMT

    [ https://issues.apache.org/jira/browse/ARTEMIS-1807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16439691#comment-16439691
] 

ASF GitHub Bot commented on ARTEMIS-1807:
-----------------------------------------

Github user michaelandrepearce commented on the issue:

    https://github.com/apache/activemq-artemis/pull/2015
  
    @franz1981 can you provide a perf test before and after for normal usage of the mapped
journal e.g. as the main journal. 
    
    I ask as we have ended up using it for a specific use case internally, where we are using
it for latency reasons, so i want to be sure theres no degrade for the current usage.


> File-based Large Message encoding should use read-only mmap
> -----------------------------------------------------------
>
>                 Key: ARTEMIS-1807
>                 URL: https://issues.apache.org/jira/browse/ARTEMIS-1807
>             Project: ActiveMQ Artemis
>          Issue Type: Improvement
>          Components: Broker
>    Affects Versions: 2.5.0
>            Reporter: Francesco Nigro
>            Assignee: Francesco Nigro
>            Priority: Major
>
> File-based LargeServerMessageImpl should use read-only memory mapping while reading the
file, in order to:
>  * reduce the number of copiesĀ 
>  * reduce the context switches



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