How to check heap usage of a running JVM from the command line?

java memory-management garbage-collection jetty jvisualvm
Paul Taylor picture Paul Taylor · Jan 22, 2013 · Viewed 105.9k times · Source

Can I check heap usage of a running JVM from the commandline, I mean the actual usage rather than the max amount allocated with Xmx.

I need it to be commandline because I don't have access to a windowing environment, and I want script based on the value , the application is running in Jetty Application server

Answer

Mark picture Mark · Jan 22, 2013

You can use jstat, like : 

 jstat -gc pid

Full docs here : http://docs.oracle.com/javase/7/docs/technotes/tools/share/jstat.html

Related questions

How to monitor Java memory usage?

We have a j2ee application running on Jboss and we want to monitor its memory usage. Currently we use the following code System.gc(); Runtime rt = Runtime.getRuntime(); long usedMB = (rt.totalMemory() - rt.freeMemory()) / 1024 / 1024; logger.information(this, "memory …

Read More
Circular References in Java

Given an aggregation of class instances which refer to each other in a complex, circular, fashion: is it possible that the garbage collector may not be able to free these objects? I vaguely recall this being an issue in the …

Read More
Could not allocate enough heap space to Java

We have an application which was running fine for one year. It is a web application, running under Tomcat 5.5 + JDK 1.5 under Microsoft Cluster on Windows Server 2003 Enterprise Edition Service Pack 2. The server has 11Gb of RAM (I know that it …

Read More