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From: "Swindells, Thomas" <TSwindells@nds.com>
To: "users@activemq.apache.org" <users@activemq.apache.org>
Date: Tue, 5 Apr 2011 10:11:24 +0100
Subject: RE: ActiveMQ Memory Usage is going up when there is no activity
Thread-Topic: ActiveMQ Memory Usage is going up when there is no activity
Thread-Index: Acvy6WmliT6QpRJ7Ro6ZTLiqYu0qxwAhAI7Q
Message-ID: <DAC86F5F3B84F14088F0DB16092558CA0F61708C33@UKMA1.UK.NDS.COM>
References: <1301936231445-3426037.post@n4.nabble.com>
In-Reply-To: <1301936231445-3426037.post@n4.nabble.com>
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I don't know about what active mq is increasing its memory but the GC behav=
iour you are seeing for java is perfectly normal. Java performs multiple di=
fferent types of garbage collection. Generally it only performs quick basic=
 GC cycles which purge out only easily detected objecst (the small sawtooth=
s on the graph). Only when memory is getting overly full does it try more a=
ggressive (and time consuming) GC cycles - or when you press the button on =
console.

In term of memory usage there are probably a whole load of temporary short =
lived objects which may accumulate over time even if there aren't any messa=
ges being sent, things such as log records (even if they aren't written to =
disk), keep alive messages, other housekeeping operations could all accumul=
ate a backlog of objects that the gc doesn't bother to spend much effort on=
 trying to tidy up until it needs to.

What I don't get is why you think you need help, are you actually experienc=
ing any actual problems?

Thomas

> -----Original Message-----
> From: nnprasad [mailto:NNakarikanti@dwd.IN.gov]
> Sent: 04 April 2011 17:57
> To: users@activemq.apache.org
> Subject: ActiveMQ Memory Usage is going up when there is no activity
>
> http://activemq.2283324.n4.nabble.com/file/n3426037/ActiveMQMemory.jpg
> http://activemq.2283324.n4.nabble.com/file/n3426037/AMQ-Heap-GC.jpg
> http://activemq.2283324.n4.nabble.com/file/n3426037/AMQ-OutofMemory.jpg
> http://activemq.2283324.n4.nabble.com/file/n3426037/AMQ-GC.ppt AMQ-
> GC.ppt
> http://activemq.2283324.n4.nabble.com/file/n3426037/activemq.xml
> activemq.xml
>
>
>
> I could not understand Why ActiveMQ is consuming and increasing its
> Memory
> usage, when there is no activity on queues.
>
> It seems no GC thread running in ActiveMQ, because when ever I am
> running
> Perform GC in JConsole the graph drops down immediately.
>
> Please look into attachments, in ActiveMQMemory.JPG file please observe
> the
> vertical straight line of memory usage WHEN THERE IS NO ACTIVITY ON
> QUEUES
> i.e no producer or consumer are working, though there are some
> persisted
> messages were there.
>
> Environment: ActiveMQ 5.2.0 / Windows 2003 server / Oracle 10g / TCP
> openwire / JVM 512 MB.
>
>
> Please look into attachment / Please Help Me.
>
> Thank You,
> Nag.
>
> --
> View this message in context:
> http://activemq.2283324.n4.nabble.com/ActiveMQ-Memory-Usage-is-going-
> up-when-there-is-no-activity-tp3426037p3426037.html
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.


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