Java Heap Size Parameters meaning

[Former Member]

In Config tool I am seeing below Heapsize parameters.

-XX:MaxPermSize=512M

-XX:PermSize=512M

-Xms3072M

-XX:NewSize=340M

-XX:MaxNewSize=340M

When I went to sap notes 1303953nit show as

globalArea | -Xps

initialHeapSize | -Xms

maxHeapSize | -Xmx

maxNewSize | -XX:MaxNewSize

maxPermSize | -XX:MaxPermSize

newRatio | -XX:NewRatio

newSize | -XX:NewSize

permSize | -XX:PermSize

But somebody can explain me the meaning of NewSize, MaxNewSize, global ARea, maxNewSize, maxPermSize, permSize ?

In what way they are different from heapsize ?

Thanks

kumar

[fjhernanz]

Hi,

You can find a lot of information about the JVM memoery settings and the parameters meaning just googling a little bit. You can direct to the Oracle website (which bougth Sun and therefore Java), or i.e to:

http://www.docstoc.com/docs/11550777/Java-Garbage-Collection-and-Memory-Architecture

The parameters are explained in that ppt. The note you mention is the recommendation for SAP systems

Br,

Javier