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How JVM Settings Affect Flexmojos Performance

Flex compiler does use lot's of memory and CPU resources, so does Flexmojos. There's not much new in here.

Some time ago I was reading this blog post with some memory parameter suggestion. And guess what, compilation becomes faster using it.

There are 2 ways to change maven JVM settings:

1 - Editing launch files

Edit mvn (non-Windows) or mvn.bat (windows) and add the following line:

$ set MAVEN_OPTS=-Xms512m -Xmx1024m -XX:MaxPermSize=256m -XX:PermSize=64m

On Windows you can add that on the first line and on non-Windows systems you must add that after "#!/bin/sh"

2 - Setting an environment variable

This process will vary from OS to OS.
Just add an environment variable with name equal to "MAVEN_OPTS" and the value equal to "-Xms512m -Xmx1024m -XX:MaxPermSize=256m -XX:PermSize=64m" both w/o quotes.

The main advantage for the second method is that it will still work even after Maven is updated.

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Written by Marvin Froeder

Over the past 11 years, Marvin has worked for several startups, most notably at The Last Pickle, ContaAzul, and Sonatype, where he was a Java Developer.