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From "Alan Conway (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-3960) Performance regression in priority queue implementatino.
Date Mon, 23 Apr 2012 13:33:34 GMT

    [ https://issues.apache.org/jira/browse/QPID-3960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13259600#comment-13259600
] 

Alan Conway commented on QPID-3960:
-----------------------------------

Review at https://reviews.apache.org/r/4814/
                
> Performance regression in priority queue implementatino.
> --------------------------------------------------------
>
>                 Key: QPID-3960
>                 URL: https://issues.apache.org/jira/browse/QPID-3960
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Broker
>    Affects Versions: 0.16
>            Reporter: Alan Conway
>            Assignee: Alan Conway
>
> Commit 1307582 introduced a serious regression in the performance of priority queues.
>     QPID-3603: Keep acquired messages on queues for all queue types.
>     
>     Updated priority and lvq queues to keep acquired messages, and supply
>     them to browsers if requested. This is necessary so replicating
>     subscriptions can back-up these queue types without message loss.
>     
> To demonstrate the slowdown, run this on the broker before and after the commit:
>    qpid-send -a "test1;{create:always,node:{x-declare:{arguments:{'qpid.priorities':10}}}}"
--priority 5 --content-size 259 -m 25000 --report-total
> E.g. on my test I see 24112 m/s before and 4549 after. Note that if you repeatedly run
the test the results get progressively worse, so it appears to be related to queue depth.

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