is permanent generation part of memory reserved using xmx parameter?

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+1 Q:

is permanent generation part of memory reserved using xmx parameter?

In java we can define max memory that process can take using xmx parameter. For perm gen we can define the MaxPermSize. So is the perm gen space is also part of memory allocated using xmx parameter.

so is xmx = young + old OR young + old + perm OR young + old + perm + Stack space ?

+3 A:

So is the perm gen space is also part of memory allocated using xmx parameter.

No, the permanent generation space is a separate memory area. Here is a nice picture illustrating it visually:

Source: Process heap, Eden, Tenured and Permgen.

Pascal Thivent 2010-09-26 04:05:36

Nice pic. For the lazy, here's a direct link to the full size version: http://i.imgur.com/pmJMC.png

BalusC 2010-09-26 04:21:28

@BalusC You mean too lazy for right-click > View Image? :) Will make the picture clickable for these über lazy.

Pascal Thivent 2010-09-26 04:24:38

Actually, I drag and drop the image in a new Firefox tab :)

BalusC 2010-09-26 04:26:41

@BalusC This saves one click if you have a tab open. But you have to move the mouse!

Pascal Thivent 2010-09-26 04:27:32

It's not necessary to have a tab open. Just drop in tab bar. And, my mouse is fast .. very fast :)

BalusC 2010-09-26 04:31:00

ansaurus

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is permanent generation part of memory reserved using xmx parameter?

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