Parallel run of OpenRadioss Build e10539f is confusing about openradioss

[BastiLoe]

Litte more information on this case: I use the precompiled binary of OpenRadioss and compiled openmpi 4.1.2 from source, as recommended.

[roguic]

Hi @BastiLoe ,

The starter creates restart files. Restart files are read and used by the engine.
If you want to use M mpi tasks for the engine, you need to create M restart files, so you need to run the starter with the following command line : ./starter_linux64_gf -np M -i my_model_0000.rad

The starter (and the engine) uses an OpenMP parallelization : the elapsed time of the starter can be decreased if the number of openmp threads is greater than 1. If you want to use N OpenMP threads, you need to run the following command line :
export OMP_STACKSIZE=400M
export OMP_NUM_THREADS=N
./starter_linux64_gf -np M -i my_model_0000.rad

or you can used the -nt option :
export OMP_STACKSIZE=400M
./starter_linux64_gf -np M -i my_model_0000.rad -nt M

You always need to check your stacksize :
ulimit -a
if your stacksize is not set to unlimited, then use the following command line
ulimit -s unlimited

Best,
Romain

[BastiLoe]

./starter_linux64_gf -np M -i my_model_0000.rad -> Clear and as already working before
export OMP_STACKSIZE=400M -> I missed the "M" - this seemed to be the main issue, now it seems to be working as well

./starter_linux64_gf -np M -i my_model_0000.rad -nt M -> I think this line should end wtho "-nt N" not "-nt M".

[roguic]

Hi @BastiLoe ,

Sorry I was too fast : ./starter_linux64_gf -np M -i my_model_0000.rad -nt M is wrong, the good command line is ./starter_linux64_gf -np M -i my_model_0000.rad -nt N

Best,
Romain