MemoryInfo Class

Description

You can acquire the memory information of garbage collection directly from a Java program.

For example, the space that is being currently used is calculated with the following expression:

getXXXTotalMemory()-getXXXFreeMemory()

The package of the MemoryInfo class is JP.co.Hitachi.soft.jvm.

List of methods

Method name	Function
getEdenFreeMemory Method	Acquires the available space in the Eden area.
getEdenMaxMemory Method	Acquires the maximum space used by the Eden area.
getEdenTotalMemory Method	Acquires the available space in the Eden area.
getPermFreeMemory Method	Acquires the available space in the Permanent area.
getPermMaxMemory Method	Acquires the maximum space used by the Permanent area.
getPermTotalMemory Method	Acquires the available space in the Permanent area.
getSurvivorFreeMemory Method	Acquires the available space in the Survivor area.
getSurvivorMaxMemory Method	Acquires the maximum space used by the Survivor area.
getSurvivorTotalMemory Method	Acquires the available space in the Survivor area.
getTenuredFreeMemory Method	Acquires the available space in the Tenured area.
getTenuredMaxMemory Method	Acquires the maximum space used by the Tenured area.
getTenuredTotalMemory Method	Acquires the available space in the Tenured area.

Usage example

The examples of method usage for acquiring memory information are as follows:

For obtaining the free size of Perm area

free_memory = JP.co.Hitachi.soft.jvm.MemoryInfo.getPermFreeMemory()

For obtaining the currently used Eden area

use_memory = JP.co.Hitachi.soft.jvm.MemoryInfo.getEdenTotalMemory()-JP.co.Hitachi.soft.jvm.MemoryInfo.getEdenFreeMemory()

Organization of this section: getEdenFreeMemory Method; getEdenMaxMemory Method; getEdenTotalMemory Method; getPermFreeMemory Method; getPermMaxMemory Method; getPermTotalMemory Method; getSurvivorFreeMemory Method; getSurvivorMaxMemory Method; getSurvivorTotalMemory Method; getTenuredFreeMemory Method; getTenuredMaxMemory Method; getTenuredTotalMemory Method

10.5 MemoryInfo Class