Blog dedicated to Oracle Applications (E-Business Suite) Technology; covers Apps Architecture, Administration and third party bolt-ons to Apps

Wednesday, June 10, 2009

Xms Xmx and PermSpace

Guru asked me this question today about the Xms Xmx and Permspace parameters passed to java programs.

-Xms is the initial heap size and

-Xmx is the maximum

PermSpace is the area of the VM that is used to store data structures
and class information (not instances, but the class definitions


Keep in mind that the permanent area is not a subset of the heap.
The pictures on the page
erroneously show permspace as a subset of the heap defined by -Xmx
parameter. This is a bug in the documentation (state February 2004).

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