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