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Tomcat 7 heap config vs hardware

John Beaulaurier

Joined: Sep 06, 2013
Posts: 3

Is there a ratio or some formula for a initial heap configuration agaist the CPU / memory the JVM is going to run on?

Tim Holloway
Saloon Keeper

Joined: Jun 25, 2001
Posts: 16728

Welcome to the JavaRanch, John!

I haven't checked recently, but last time I looked, Tomcat ran using default JVM memory settings. Which for the Sun JVM was 128MB. I recommend starting with 256MB in most cases, though.

The standard memory management rules are sufficient except for PermGen space, which may need to be overridden if you are working with ORM-based apps such as Hibernate.

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subject: Tomcat 7 heap config vs hardware