Global Model

Running a Global Model

To run large or Global scale simulations in STEM, you will need to increase the heap size available to the STEM JVM. This will require a 64 bit machine - and probably a scientific workstation rather than a laptop.

The method for increasing the heap size depends on which operating system you are using:

Mac OS X:

From the folder you unzipped STEM, access the STEM.ini file located under STEM.app/Contents/MacOS. 
Open the file in a text editor and change the line -Xmx1024M to a larger number. 
For instance, to give 4 GB of maximum heap size to the STEM application change the line to -Xmx4096M. 

Linux/Windows:

From the folder where you unzipped STEM (same location where the STEM executable is located), 
open the STEM.ini file and modify the -Xmx1024M line to increase the maximum heap size to any value you desire.  
For instance, to give 4 GB of maximum heap size to the STEM application change the line to -Xmx4096M.

Please Note

To set the  maximum heap size to anything larger than 1024 MB, you must be running a 64 bit operating system.