I was happily using Eclipse 3.2 (or as happy as one can be using Eclipse) when for a forgotten reason I decided to upgrade to 3.4. I\'m primarily using PyDev, Aptana, and Su
With those options, I manage to limit the memory used to 700Mo (which is quite high, but still workable with my 2 Go)
-vmargs
-Xms128m
-Xmx384m
-Xssv2m
-XX:PermSize=128m
-XX:MaxPermSize=128m
-XX:CompileThreshold=5
-XX:+UseParallelGC
-Dcom.sun.management.jmxremote
And consider also to launch
C:\[jdk1.6.0_0x path]\bin\jconsole.exe
And choose 'Connection / New connection / 'eclipse' to monitor the memory used by eclipse
(which is why I use '-Dcom.sun.management.jmxremote')
Other options are available here.