How to minimize memory usage with VM settings

Using JDK 1.4.2, I am trying to minimize the memory usage of my application.
Our GUI application consumes about ~20MB of heap space during normal operation, but it can easily grow to 50MB in some rare cases (Special feature accessed by user).
We have to be able to run multiple instances (separate process/VMs) of this application on low end Windows PCs.
The applications don't usually run for very long (less than 8 hours).
Here is my problem.
If I set the -Xms=20M -Xmx=64M, it works fine, but the GC is not very aggressive and soon, the application starts using a lot of memory, even if it is not really needed. And it never returns the memory to Windows OS.
So each VM take more memory than really needed, which causes significant swapping on these low end PC (little RAM available).
If I reduce the -Xmx flag, than I run out of memory in the rare cases where I need the full memory.
Ideally, I would like to configure the GC to be more aggressive, i.e. the GC should collect instead of getting additional memory from the OS when possible.
I read a few papers on Sun's web site about HotSpot tunning, but most of them are geared for large servers.
Thanks!
Francois

And you are using the task manager to determine how "much" memory is being used correct?
I suggest that you search out and read the numerous threads on this site that discuss that subject.

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How To Determine Your Memory Needs >>
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