OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › mpi running does not work › Re: mpi running does not work July 31, 2017 at 9:28 pm #2682 KaiMember Hi, I found the reason now. There are more than one mpi installation in my machine. I used mpirun and mpic++ from different installations (maybe more things were messed up). Now it works fine.