Comments on: Playing with JVM / Java Heap Size.

By: snehal

snehal — Wed, 16 May 2012 08:47:14 +0000

And how to do this permanent heap size setting in Unix?

By: Chaitanya

Chaitanya — Sun, 13 May 2012 17:26:25 +0000

I have a spice qt-61.in it Java apps open too slowly can i do anything for it

By: Viral Patel

Viral Patel — Thu, 08 Mar 2012 10:48:07 +0000

The heap settings are done as command line arguement for JVM (java command). You need to check where you want to give heap preferences. Check the JVM command (java ..) and pass these parameters accordingly.

By: Janaki

Janaki — Thu, 08 Mar 2012 10:32:57 +0000

Can let know where to do the heap settings? exact path to do the settings.

By: Kellie B

Kellie B — Mon, 10 Oct 2011 10:02:01 +0000

I need to ‘increase java heap size in jvmcfg.ini’ I have no idea what this means but from the information above see I need to ‘Xmx set maximum Java heap size’, what does that mean I actually do? Cut and past that somewhere?

I have a macbook and am not down with computer lingo so would really love some basic straightforward instruction for dummies.

By: JigSaw

JigSaw — Thu, 29 Sep 2011 19:21:59 +0000

In Windows you should write it as;
java -Xms64m -Xmx1024m -jar MyProgram.jar

java -Xms64m -Xmx256m HelloWorld doesn’t work for me, I added -jar part and it works now.

By: Chris

Chris — Tue, 20 Sep 2011 02:55:54 +0000

There is a way to set this permanantly. In windows, go to control panel, click java, go to java tab, click view, and under runtime parameters put -Xmx4G or whatever size you want

By: Dala

Dala — Thu, 08 Sep 2011 20:58:16 +0000

I think it is not the real reason
bye

By: Dala

Dala — Thu, 08 Sep 2011 20:44:26 +0000

HI
I tried to increase the java heap size I used this command line:
java -Xmx1K
I have this error :
error occurred during initialization of VM
could not reserve enough space for object heap
could not create the java virtual machine
I search and found the reason of this error is Heap size is larger than my computer’s physical memory , and I don’t know if it the real reason is the physical memory , can any one help my to fixed this error .

By: rajesh.kolli

rajesh.kolli — Wed, 25 May 2011 08:54:14 +0000

you can read different parts of the heap on the following link:

http://java-espresso.blogspot.com/2011/05/heap-structure-in-jvm.html
Gist of the article is below:

Following are the parts in JVM heap:

Young Generation
Eden Space
Survivor space
Virtual space
Tenured (Old) generation:
Virtual Space
Other Areas: Not a part of heap:
PermGen Area
Native Area

http://viralpatel.net/blogs/2009/01/jvm-java-increase-heap-size-setting-heap-size-jvm-heap.html

http://hausheer.osola.com/docs/5

http://www.codemiles.com/java/here-how-to-increase-java-heap-size-t663.html