"Out of Memory": HSSF vs XSSF

[Dobson, Paul L CTR USAF AFMC 416 SCMS/OBN]

I know it is common to get "Out of memory" errors when creating large
files and increasing heap space helps.  It seems though that with the
XML version (3.5 beta 3), I can only put a small fraction of the data in
a file using XSSF that I can using HSSF.  Seriously, I'm talking well
over 10 times as much data using HSSF.  Is this normal or am I using the
XSSF code inefficiently?

 

Thanks for any input.

 

Paul