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From Martin Lichtin <lich...@yahoo.com.INVALID>
Subject Re: Re: Performance issue in FilePendingMessageCursor.isEmpty()
Date Sun, 10 Apr 2016 19:38:29 GMT
Ok, I submitted a JIRA https://issues.apache.org/jira/browse/AMQ-6239

On 10.04.2016 06:11, Tim Bain wrote:
> Looks like your attachment from YourKit was stripped off.
>
> But your suggestion seems like a reasonable improvement; submit a JIRA
> enhancement request.  Even better, a patch or a pull request!
> On Apr 9, 2016 11:51 AM, "Martin Lichtin" <lichtin@yahoo.com.invalid> wrote:
>
> With a test sending 5000 messages to a queue, I see heavy CPU use on the
> broker side (v 5.12.2).
> Using Yourkit it shows that the hot spot methods are
>
>
>
> FilePendingMessageCursor.isEmpty() iterates over in-memory messages and
> therefore (as it is a prioritized queue) uses
> PrioritizedPendingListIterator which uses OrderedPendingList.getAsList()
> which turns out to be an expensive method as it converts the self-managed
> linked list to a Java ArrayList.
>
> I wonder if anyone else has seen this issue?
>
> Perhaps PrioritizedPendingListIterator could be improved to walk the
> priority lists via OrderedPendingList iterators, as these are implemented
> efficiently.
>
> - Martin
>


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