Dear mpich users, I'm looking for an environmental variable which can be used in a bash script to identify the process rank. I launch a bash script using mpi: mpirun ./my-script.sh In my-script I want to use the rank of the process to identify which input file to use. In OpenMPI, I used OMPI_COMM_WORLD_RANK and my-script.sh looked like the following: inputName="MyInput_$OMPI_COMM_WORLD_RANK"./myexe $inputName What can be used in MPICH instead of OMPI_COMM_WORLD_RANK? I found somewhere that $PMI_RANK is the same but I found that it is empty. Kirill Lykov, Mr. Doctoral Assistant Institute of Computational Science Faculty of Informatics Università della Svizzera italiana, USI Via G. Buffi 13 CH - 6904 Lugano (e) [email protected] (t) +41 (0) 788413392