Performance regression in priority queue implementatino.
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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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