Sunday, November 18, 2007

Default Heap Size

If not otherwise set on the command line, the sizes of the initial heap and maximum heap are calculated based on the size of the physical memory. If phys_mem is the size of the physical memory on the platform, the initial heap size will be set to phys_mem / DefaultInitialRAMFraction.

DefaultInitialRAMFraction is a command line option with a default value of 64. Similarly the maximum heap size will be set to phys_mem / DefaultMaxRAM.

DefaultMaxRAMFraction has a default value of 4.

About Generational GC
JVM heap size
Heap Size
Heap Size Options
Heap Size

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