Why can't you increment? 32 bit JVM?
UPDATE: Did some research. While it is possible to edit Zend Studio's JVM usage,
This support forum post states 32 bit JVM is needed (I guess they use 32 bit native DLLS.
A 32 bit JVM is limited to about 1.5 GB addressable space. You might be able to tweak things further, but it's gonna be a stretch.
Therefore your only solutions are mostly out of your hands
- Zend Studio updates to 64 bit support
- Zend Studio adjusts memory usage
- You figure out a way not to use as much memory yourself.