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From Christian Posta <christian.po...@gmail.com>
Subject Re: Re: ActiveMQ topic vs queue
Date Wed, 20 Mar 2013 02:40:28 GMT
SuoNayi,
My mistake, you're correct. PFC should hit at 64MB.

comradgre,
in your case, increase the system limits should be helpful. If you're doing
persistent messaging on queues, you can turn off PFC and allow the cursor
to know when the cache is full and not store to memory anymore. How big are
your messages?


On Tue, Mar 19, 2013 at 6:02 PM, SuoNayi <suonayi2006@163.com> wrote:

> I don't think the default memory usage and 100MB for the queue memory
> limit will lead to OOM.
> Because PFC is enabled for the queue and the default message cursor will
> take care of the usage.
> Disabling PFC and using vmcursor is the first suspect to lead to OOM.
>
>
>
> At 2013-03-19 22:05:10,"Christian Posta" <christian.posta@gmail.com>
> wrote:
> ><systemUsage> entries will set limits for mem, store, temp, etc for entire
> >broker. if you comment them out, they'll revert to default entries
> >
> http://activemq.apache.org/producer-flow-control.html#ProducerFlowControl-Systemusagewhich
> >are quite low depending on your requirements.
> >
> >The default for memoryUsage is 64MB but you set your queue memoryLimit to
> >100MB. That could very well lead to OOM.
> >
> >Please take a look at
> >http://activemq.apache.org/producer-flow-control.html
> >http://activemq.apache.org/javalangoutofmemory.html
> >http://www.christianposta.com/blog/?p=273
> >
> >
> >On Mon, Mar 18, 2013 at 11:58 PM, comradgre <comradgre@gmail.com> wrote:
> >
> >> Hi!
> >> Current system have about 100 messages per second. Could you pls help me
> >> avoid flooding issue and improve performance of current activeMQ.
> >> Please see attached activemq.xml
> >> activemq.xml
> >> <http://activemq.2283324.n4.nabble.com/file/n4664859/activemq.xml>
> >> Current MQ have 2 queues: inq and outq.
> >>
> >> Sometimes i think, that it will be better to switch off
> producerFlowControl
> >> and enable <systemUsage>, but i don't understand how to change current
> conf
> >> file to have it (should I disable memoryLimit of policyEntry, what
> >> systemUsage elements should be enable).
> >>
> >> Please help me, thanks!
> >>
> >>
> >>
> >> --
> >> View this message in context:
> >>
> http://activemq.2283324.n4.nabble.com/ActiveMQ-topic-vs-queue-tp4664859.html
> >> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
> >>
> >
> >
> >
> >--
> >*Christian Posta*
> >http://www.christianposta.com/blog
> >twitter: @christianposta
>



-- 
*Christian Posta*
http://www.christianposta.com/blog
twitter: @christianposta

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