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Old June 16th, 2009, 09:38 PM
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Default specify heap and oerm gen size for jvm

When you start up jvm, you can specify heap size and PermGen size, for example '-Xms512m -Xmx1024m -XX:PermSize=384m -XX:MaxPermSize=512m".

Here is my question, heap consists three parts: young gen, old gen and perm gen so it sounds like, in the above case, max yound + max old + max perm should equal to 1024m. But when I read jstat -gccapacity, it seems like max young + max old = 1024m.

Cannot really find any document specifically answering my question, so any idea?

(I initially posted this in basic java forum, but thought it more at pro level.)
 
Old June 25th, 2009, 05:42 AM
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http://www.freshblurbs.com/explainin...-permgen-space

specify heap and permgen size for jvm
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