> Under Windows, I've even seen users unable to run Sweet Home 3D with - 
> Xmx1024m! As I never found out why, I was obliged to set -Xmx to 512 
> under this system. :-(
>
 
The reason was already mentioned in Kirk's first reply. JVM needs continuous 
virtual memory space for the value you specified by -Xmx. Usually you will 
get something around 1300M on 32-bit Windows and I also have seen machines 
where 1024M won't work. You can use VMMAP from WinInternals to see free and 
reserved virtual memory regions.
 
Jan

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