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From Li Li <>
Subject Re: server hang because of memory usage estimate not accurate?
Date Tue, 01 Apr 2014 01:18:35 GMT
the server is doing nothing but gc. no client can connect to it. even
the hawtio.
next time I will save the jstack and jmap result

On Tue, Apr 1, 2014 at 5:53 AM, Christian Posta
<> wrote:
> can you show stack traces next time it happens so we can see what the
> broker was trying to do when it "hanged"? And what constituted
> hanging? Couldn't send more messages, couldn't receive messages?
> On Fri, Mar 28, 2014 at 12:23 AM, Li Li <> wrote:
>> I am using the default configuration(maximum 4G heap) and <memoryUsage
>> percentOfJvmHeap="70" />
>> I send many small size TextMessages to server and it hangs
>> I use jmap -heap and found that the free memory is less than 100MB and
>> the server can do nothing but do gc. but gc can't free anything.
>> client can't even connect to server.
>> I use ./bin/activemq stop and it fails to stop server.
>> I have to kill -o pid
>> I guess the reason is that: activemq estimate memory by string size.
>> but for small trings, the heap are all small fragmentations.
>> I modify percentOfJvmHeap to 50 and it works better but after long
>> time, it still occurs.
> --
> Christian Posta
> twitter: @christianposta

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