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does the 'used heap' only include referenced objects? or is this where non-referenced objects are before a garbage collection?

Noted.

atm - at the moment

Thanks for the information. My...

would GC lower the heap size or the amount of heap used?

my program is running atm

heap size: 3.8GB
heap max: 8GB
used heap: 350MB

I found these two bits of text, I think i'll try System.gc() at each iteration of the bigger loops for starters

"In addition to freeing unreferenced objects, a garbage collector may also combat...

I'm getting a java.lang.outofmemoryerror: java heap space exception.

I downloaded VisualVM to try and monitor.

It seems the heap size increases but never decreases, however the heap that's used...