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I would like to increase java heap size that MagicDraw would run faster with larger models. I have 12 GB of RAM.

You can change the java maximum heap size (-Xmx) in your /bin/mduml.properties* file, in the line:

...

On 64-bit VMs, you have 64 bits of addressability to work with resulting in a maximum Java heap size limited only by the amount of physical memory and swap space your system provides.

More information about OutOfMemory problems you can find in readme.html by "OutOfMemory problem" paragraph. This file is located in <MagicDraw installation directory>For more information, see Memory allocation.

 

* If you are using MagicDraw 17.0.5 or later, the name of the property file is magicdraw.properties.