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Editorial Team
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Asked: 2026-05-23T12:00:03+00:00

An Apache Tomcat (Atlassian Confluence) instance is started using the following Java options: JAVA_OPTS=-Xms256m

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An Apache Tomcat (Atlassian Confluence) instance is started using the following Java options:

JAVA_OPTS="-Xms256m -Xmx512m -XX:MaxPermSize=256m -Djava.awt.headless=true "

However I see that after starting up it quickly eats through most of the 1GB of memory that is available on my virtual server.

 PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 6082 root      19   0 1105m 760m  16m S  0.7 74.2   5:20.51 java

Shouldn’t the overall consumed memory (heap + PermGen) stay under what is specified using -Xmx? One of the problems this is causing is that I cannot shutdown the server using the shutdown script since it tries to spawn a JVM with 256MB of memory which fails because of it not being available.

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1 Answer

  1. Editorial Team

    Total Tomcat memory consumption should be calculated at NO LESS THAN Xmx + XX:MaxPermSize (in your case, 768MB), but I do recall seeing somewhere that it can go over that. Xmx is only the heap space, and PermGen is outside the heap (kind of).

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