RE: Monitoring Heap Usage -- How?

["Boehm, Hans" <hans dot boehm at hp dot com>]

The garbage collector also checks for some environment variables that
cause it to become more verbose.  Try setting GC_PRINT_STATS and/or
GC_DUMP_REGULARLY.  (The latter may be more verbose than you like; it
produces something like a dozen characters per page in the heap.)  See
README.environment in GC the source.

Disclaimers:  I'm not sure whether or not this output ends up anywhere
reasonable in your environment, whether it includes what you want, or
whether it was even supported in that old a version.  David Daney's
suggestion is bound to produce more useful information with more work.

Hans

> -----Original Message-----
> From: java-owner@gcc.gnu.org [mailto:java-owner@gcc.gnu.org] 
> On Behalf Of Alan Eliasen
> Sent: Tuesday, May 23, 2006 3:46 PM
> To: Ted Fines
> Cc: java@gcc.gnu.org
> Subject: Re: Monitoring Heap Usage -- How?
> 
> Ted Fines wrote:
> > Hi,
> > 
> > We're using OCS (Oracle Collaboration Suite), which uses 
> GNU's  java 
> >3.2.3. I want to monitor the Heap Usage for a JVM, and despite many 
> >searches for info on this on Google, I haven't  been able to 
> find the 
> >command to do it. OCS has an 'Enterprise  Manager' web app which 
> >displays this ever-changing value on  it, but it's a 
> compiled app and I 
> >can't see how they do it.
> 
>    Do the methods in java.lang.Runtime work for your 
> purposes?  Such as totalMemory()?  They may not give all of 
> the information that you're looking for, and in fact may or 
> may not work on GCJ.  I've never tested them.
> 
> -- 
>   Alan Eliasen                 |  "When trouble is solved before it
>   eliasen@mindspring.com       |    forms, who calls that clever?"
>   http://futureboy.us/         |              --Sun Tzu
>