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From "Alan Conway (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-3960) Performance regression in priority queue implementatino.
Date Wed, 18 Apr 2012 18:30:39 GMT
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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