What is Memory tuning: -XX:MaxHeapSize?

Usage:

You can set maximum size in bytes for with:

-XX: MaxHeapSize=size[units], where size is the amount of memory in bytes of  your choice.

Examples:

To set minimum value for heap at 80MB use:

-XX:MaxHeapSize=83886080

-XX:MaxHeapSize=81920k

-XX:MaxHeapSize=80m

Description:

Sets the maximum size (in byes) of the memory allocation pool. This value must be a multiple of 1024 and greater than 2 MB. Append the letter k or K to indicate kilobytes, m or M to indicate megabytes, or g or G to indicate gigabytes. The default value is selected at run time based on the system configuration. For server deployments, the options -XX:InitialHeapSize and -XX:MaxHeapSize are often set to the same value.

Default Value:

Default value is system-dependent.

Errors:

None

Arguments related:

TODO link MinHeapFreeRatio, MaxHeapFreeRatio, Xmx, Xms, InitialHeapSize

 Related Posts

• Garbage collection tuning
• Garbage collectors documentation
• JVM memory model

NOTE:

If you have additional comments, interesting experiences or even point of disagreement with this JVM argument description, please leave a comment. Your insights will help the entire 10+ million java developer community to develop one standard source of documentation for all the JVM arguments.