2. System configuration
Setting DAMASK options
Adjust the settings in DAMASK/CONFIG
using any text editor, the default values should work on most systems.
Setting shell environment
Depending on your shell
, execute one of the following commands to set the DAMASK environment.
Sourcing the file is necessary before compiling or running DAMASK, hence it is recommended to do it automatically when logging in.
This can be done by adding the command source command to shell initialization files
located in your home directory.
The scripts reports system environment settings in part derived from DAMASK/CONFIG
- exports the variable $DAMASK_NUM_THREADS according to the settings in DAMASK/CONFIG
- adds DAMASK/lib to $PYTHONPATH such that the
damask module can be properly imported in Python
- adds $DAMASK_BIN to $PATH if necessary and possible
- sets the limits for stack, heap, virtual memory, and physical memory via
A few words on memory limits
Please note: If you don't change the stack size, you might experience a stack overflow for large models, especially when using openMP.
Should your simulation die with a segmentation or memory fault at an early stage this is most likely the reason.
Increase the stack size using the
command in the parent shell.
- The easiest way would be to run
> ulimit -s unlimited or
> ulimit -s hard which sets the stack size to unlimited (Linux) or 64 MiB (OS X). If you want another stack limit, you basically have to try which size is necessary for your model.
Determining the optimal stack size is difficult, a good start to read about it is http://software.intel.com/en-us/forums/topic/501500