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Re: [jetty-users] Jetty9 heap bigger than -Xmx
Jetty itself runs with a very small footprint which is why it is used in embedded devices so often, it has a predicable and consistent size.  You can force it big by doing things like using an in memory session manager with really large objects shoved into the session, but that isn't Jetty per-se.

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jesse mcconnell
jesse.mcconnell@xxxxxxxxx

On Thu, Aug 20, 2015 at 7:26 AM, Guus der Kinderen <guus.der.kinderen@xxxxxxxxx> wrote:
Hi Otis,

On top of the heap (what's configured with -Xmx), java can consume a little more memory for non-Heap. Typically, that's not a lot though. 

Am I right that the page that you link displays memory usage of the entire OS, not just the Java process? That might skew your observations.

Are you familiar with the "jmap" executable that ships with Java? It allows you to review the memory usage of just your Java process from the command line. An invocation like this should give you interesting data:

jmap -heap YOUR-PROCESS-ID

Regards,

  Guus



On 20 August 2015 at 14:08, Otis Gospodnetić <otis.gospodnetic@xxxxxxxxx> wrote:
Hello,

We are using default Jetty 9 (v20150730) and Tomcat (v8) setup with the same war file behind the same ELB and see that memory consumption is very different.
Jetty uses much more memory than what's specified in -Xmx.

Any idea why that is and whether it can be changed?
This is on Java8.

For example, have a look at this:

spm-reports1 machine is running Tomcat
spm-reports2 is running Jetty9 (v20150730)

Is there anything we should look into to lower the Jetty 9 memory footprint?

Thanks,
Otis
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Monitoring * Alerting * Anomaly Detection * Centralized Log Management
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