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From "Jason Dillaman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (QPID-4287) Poor performance when a priority queue with a ring queue policy has a large backlog
Date Wed, 05 Sep 2012 20:39:07 GMT

     [ https://issues.apache.org/jira/browse/QPID-4287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Dillaman updated QPID-4287:
---------------------------------

    Attachment: qpid-4287.patch

Quick POC to reduce the performance degradation in the ring queue policy.  
                
> Poor performance when a priority queue with a ring queue policy has a large backlog
> -----------------------------------------------------------------------------------
>
>                 Key: QPID-4287
>                 URL: https://issues.apache.org/jira/browse/QPID-4287
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Broker
>    Affects Versions: 0.18
>            Reporter: Jason Dillaman
>         Attachments: qpid-4287.patch
>
>
> The ring queue policy utilizes a single deque to store messages in priority and FIFO
order.  When inserting messages of mixed priority into a queue with a large (>100,000)
message backlog, the performance degrades quickly enough to potentially block all broker worker
threads if they all are publishing to the same queue.  Recommend separating the ring queue
data structure into separate deques based upon message priority in order to avoid the potential
for reshuffling the deque with each incoming message.

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