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From Alan Conway <acon...@redhat.com>
Subject Re: SubscriptionManager performance problem.
Date Fri, 26 Feb 2010 14:30:20 GMT
On 02/26/2010 08:56 AM, Gordon Sim wrote:
> On 02/26/2010 10:13 AM, David Stewart wrote:
>> The session was synchronous. Using the AsyncSession brought the 75
>> seconds down to 5-10 which is a fantastic improvement.
>> The bottleneck still appears to be the SessionManager though.
>
> SessionManager::subscribe() is synchronous, which will impact the rate.
> One tip is to turn off message flow when you subscribe (use
> SubscriptionSettings(FlowControl::messageWindow(0))) and then add credit
> to resize the window on each subscription after you are set up
> (Subscription::grantMessageCredit() or Session::messageFlow()) to enable
> messages to flow (this can be asynchronous). I get through 20000 in ~25
> secs on my laptop with that (see attached).
>
> However can I ask why you need a separate queue per exchange? Could you
> instead have one queue bound into each of the exchanges? That would be
> far more efficient (both for setup and at runtime) and would still give
> you all the messages sent to any of those exchanges.

That is probably a better solution than my patch for async subscribe.

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