I'm currently working with a large project (big piece of ***) , for which the current default vm options shipped with IDEA is not adequate.
I thus went to settings>idea vm options and changed the XMX param to 2048m (i've got 4Go of memory on this machine).
I then closed IDEA and tried to restart it, but it didn't want to ! :)
Tuning down the XMX to 1024m resolves the problem, but it can't find anything describing a max allowed value for XMX in sun document for JDK 1.5.
Has anyone any more info about it ?