Display Default Heap Size

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apiccirilli@gmail.com - 20 Sep 2006 20:16 GMT

Hi all -

I've scoured the internet for this and can't find any helpful
information. Is there any way for the JVM to display the default
maximum heap size on a system? I can't seem to figure out what it is
using as its maximum value, if I don't manually override it with -Xmx.

Any help would be really appreciated.

Thanks -

Aaron

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Ian Shef - 20 Sep 2006 20:52 GMT

apiccirilli@gmail.com wrote in news:1158779800.453216.194170
@b28g2000cwb.googlegroups.com:

> Hi all -
>
[quoted text clipped - 8 lines]
>
> Aaron

The javadocs are your friend! It is documented in the javadoc for the tool
"java".

For Windows, see:
http://java.sun.com/j2se/1.5.0/docs/tooldocs/windows/java.html
For Linux and Solaris, see:
http://java.sun.com/j2se/1.5.0/docs/tooldocs/solaris/java.html

If you don't believe the javadocs and have to see it for yourself...
With JDK version 1.5, you can use jconsole (also in the tool javadocs) to
provide the current and maximum heap size of a running VM.

Signature

Ian Shef 805/F6 * These are my personal opinions
Raytheon Company * and not those of my employer.
PO Box 11337 *
Tucson, AZ 85734-1337 *

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apiccirilli@gmail.com - 20 Sep 2006 21:11 GMT

> apiccirilli@gmail.com wrote in news:1158779800.453216.194170
> @b28g2000cwb.googlegroups.com:
[quoted text clipped - 29 lines]
> PO Box 11337 *
> Tucson, AZ 85734-1337 *

Thanks for the quick reply. The default values aren't of too much help
I'm afraid - the machines I'm working with are on an academic cluster,
and the JVMs are not typical on the machines. The jconsole tool,
though, will be a big help. I found another way (albeit, somewhat
hacked) to get the default max heap - if you keep setting the Xms
option higher and higher, it will error when you go above the default
max heap value. However, I never knew too much about the jconsole tool
- I think that it will be helpful for a lot of other monitoring stuff
that I need to do soon. Thanks again!

Aaron

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IchBin - 20 Sep 2006 22:48 GMT

> apiccirilli@gmail.com wrote in news:1158779800.453216.194170
> @b28g2000cwb.googlegroups.com:
[quoted text clipped - 23 lines]
> With JDK version 1.5, you can use jconsole (also in the tool javadocs) to
> provide the current and maximum heap size of a running VM.

If you want to monitor look at jconsole.exe

It resides your Java's install bin subdirectory.:

Signature

Thanks in Advance...
IchBin, Pocono Lake, Pa, USA http://weconsultants.phpnet.us
__________________________________________________________________________

'If there is one, Knowledge is the "Fountain of Youth"'
-William E. Taylor, Regular Guy (1952-)

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