OK - So I have a laptop with 6GB RAM. And I've just installed Netbeans - and I want to debug a Drupal.
(BTW - I installed Netbeans from the main Netbeans site and not from the Ubuntu repository due to concerns RE the current repository version).
Netbeans seems to be slow.
This is what I set the in the file:
/usr/local/netbeans-7.2/etc/netbeans.conf
netbeans_default_options="-J-client -J-Xss2m -J-Xms128m -J-Xmx512m -J-XX:PermSize=128m -J-XX:MaxPermSize=512m -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.graphics.UseQuartz=true -J-Dsun.java2d.noddraw=true -J-Dsun.zip.disableMemoryMapping=true"
Note:
Xms - initial heap memory.
Xmx - Maximum heap memory.
Once these have been set we also need to set the values for the Perm memory which is separate:
PermSize - Initial memory for Perm.
MaxPermSize - Maximum allowed for Perm memory.
In both cases the Maximums had to be raised as the default values are too low.