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Environment/Versions TTworkbench 32/64 Bit, Microsoft Windows/Linux Answer For execution of big projects, you need to increase the memory reservation for Java runtime to avoid any memory errors*. Go to the TTworkbench menu Window > Preferences > TTCN-3 > Execution - TTman > under 'VM arguments' add the following: -Xmx1024m  (32bit OS) -Xmx2048m  (or more, if available on 64bit OS)     Notes: The above setting is for the workspace. This setting can be done for a specefic project via right click on the Project > Properties > TTCN-3 > Execution - TTman > Enable project specific settings. (*) Memory errors as 'out of memory error', 'heap out of memory' or 'PermGen memory error'. Related settings: More TTworkbench memory settings can be found in the following Articles: FAQ17515 How to enhance execution performance? FAQ17512 How to enhance compiler memory?