Comsol: Tuning the Java heap size

If you get an error message like this: 
                Error in sweep: Java heap space
try to increase the Java heap. Open the comsol.ini file located in the subdirectory bin/$arch in the COMSOL installation directory, where $arch corresponds to the platform you are using. Modify the number in the row that starts with -Xmx, its value is the Java heap size. If you have enough RAM, try doubling the size. This will give the line -Xmx2048m for a 64-bit platform. Repeat this for all *.ini files in the same directory.

If you do not have write permission to the bin/$arch directory, you can instead try the following:

• Copy the comsol.ini file to a folder where you have write permission.
• Open the file and modify it according to the instructions above.
• When you launch COMSOL, add the option -comsolinifile [path] to the COMSOL command, where [path] is the path to your new comsol.ini file.

Also here we can find some recommendations on how to deal with java.lang.OutOfMemoryError in Java, http://javarevisited.blogspot.co.il/2011/09/javalangoutofmemoryerror-permgen-space.html