Due to recent bot attacks we have changed the sign-up process. If you want to participate in our forum please send a message via our contact form. › Forums › OpenLB › General Topics › Number of threads in MPI paralellization › Re: Number of threads in MPI paralellization July 19, 2012 at 7:49 am #2055 kulkaMember To use 4 cores you should run mpirun(or mpiexec) -np=4 ./cylinder3d