Eclipse memory settings when getting "Java Heap Space" and "Out of Memory"

java apache-flex eclipse memory
Brandon picture Brandon · Dec 2, 2008 · Viewed 184.7k times · Source

When trying to launch and run a flex/java project in eclipse I kept getting a "Out of Memory Exception" and "Java Heap Space" using Eclipse, Tomcat and a JRE.

While researching trying to adjust the memory settings I found three places to adjust these:

  • Eclipse.ini

  • The JRE Settings under Window > Preferences

  • Catalina.sh or Catalina.bat

What are the differences between setting -xms and -xmx in these different places and what does is mean?

Is there any way to verify these memory settings are being set accordingly?

What are the optimal -xms and -xmx settings for a computer with 2gb of RAM?

Any other memory tips?

Thanks.

Answer

Vinze picture Vinze · Dec 2, 2008

-xms is the start memory (at the VM start), -xmx is the maximum memory for the VM

  • eclipse.ini : the memory for the VM running eclipse
  • jre setting : the memory for java programs run from eclipse
  • catalina.sh : the memory for your tomcat server

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