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From "Vamsavardhana Reddy" <c1vams...@gmail.com>
Subject Re: How to get memory statistics from a remote Geronimo runtime?
Date Tue, 04 Dec 2007 14:58:44 GMT
I don't know if it is necessary to add the statistics from Runtime.  Here is
the relationship I see between the stats from Runtime and those got from
MemoryMXBean.getHeapMemoryUsage()

Runtime.totalMemory() == MemoryUsage.getCommitted()
Runtime.maxMemory() == MemoryUsage.getMax()
Runtime.freeMemory() == MemoryUsage.getCommitted() - MemoryUsage.getUsed()
Runtime.totalMemory() - Runtime.freeMemory() == MemoryUsage.getUsed()

++Vamsi


On Dec 4, 2007 6:51 PM, Anita Kulshreshtha <a_kulshre@yahoo.com> wrote:

>   If you are interested in usedMemory and maxMemory as given by
> Runtime, we could add that again. The JVM Stats give a rough estimate
> of heap memory only.
>
> Thanks
> Anita
>
> --- Vamsavardhana Reddy <c1vamsi1c@gmail.com> wrote:
>
> > I am wondering if the following (which works) is the correct way to
> > get
> > maxHeapSize and usedMemory from a remote Geronimo server.
> >
> > import
> > org.apache.geronimo.management.stats.BoundedRangeStatisticImpl;
> >
> >         Map map = new HashMap();
> >         map.put("jmx.remote.credentials", new String[] {user,
> > password});
> >         JMXServiceURL address = new JMXServiceURL(
> >                 "service:jmx:rmi:///jndi/rmi://"+host+ ":" + port +
> > "/JMXConnector");
> >         JMXConnector jmxConnector =
> > JMXConnectorFactory.connect(address,
> > map);
> >         mbServerConnection = jmxConnector.getMBeanServerConnection();
> >         objName = ObjectName.getInstance
> > ("geronimo:J2EEServer=geronimo,name=JVM,j2eeType=JVM");
> >         Stats stats = (Stats)
> > mbServerConnection.getAttribute(objName,
> > "stats");
> >          BoundedRangeStatisticImpl statistic =
> > (BoundedRangeStatisticImpl)
> > stats.getStatistic("HeapSize");
> >         long maxMemory = statistic.getUpperBound();
> >         long usedMemory = statistic.getCurrent();
> >
> > Is this ok?  Or, is there a better way?
> >
> > ++Vamsi
> >
>
>
>
>
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