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Heap size for JVM 1.6

Baiju Scariah
Ranch Hand

Joined: Mar 17, 2005
Posts: 33
Hello,

Can someone please let me know what is the default minimum and maximum heap size for JVM, if -Xms and –Xmx are not specified in Windows and Solaris environment?

I am using jre1.6 on Windows VISTA, XP environments

I am using jre1.6 on Solaris 10

Thanks,
Baiju S
Bob Wheeler
Ranch Hand

Joined: Apr 24, 2009
Posts: 317
Hi,
I can give you code to get your default and max heap size:


I hope that helps a little bit and I hope that's correct lol.
cheers
Bob


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Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 14074
    
  16

This question does not have anything to do with the SCJP exam. I will move it to a more appropriate forum for you.


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Ryan Anderson
Greenhorn

Joined: May 18, 2009
Posts: 21
in case anyone wanted to change there heap size @ runtime....

http://javahowto.blogspot.com/2006/06/6-common-errors-in-setting-java-heap.html
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 37958
    
  22
You should find your ways round the official Java™ documentation: look for the java tool and also look for the "ergonomics" link. You see it appears to vary from computer to computer.
Baiju Scariah
Ranch Hand

Joined: Mar 17, 2005
Posts: 33
Thanks to all for the update.

But, I am interested in knowing is there a default value for -Xmx. In other words, if we don't specify anything at runtime, does java has any default value?

Thanks
Baiju S
Rob Spoor
Sheriff

Joined: Oct 27, 2005
Posts: 19651
    
  18

Yes - 64MB. Which you could have found by searching.


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Baiju Scariah
Ranch Hand

Joined: Mar 17, 2005
Posts: 33
Thanks.

Somehow, my search wasn't successful...

Baiju
Joanne Neal
Rancher

Joined: Aug 05, 2005
Posts: 3420
    
  12
Rob Prime wrote:Yes - 64MB. Which you could have found by searching.


Actually, since Java 1.5, that's no longer true in all cases. See the ergonomics link that Campbell posted.


Joanne
 
It is sorta covered in the JavaRanch Style Guide.
 
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