Hi, I'm working on a supercomputer which only provides Spectrum MPI implementation in modules. Since our code does not perform well with Spectrum MPI I decided to install an MPICH build on our own partition (I'm not an administrator.) The supercomputer has a rhel8 system on ppc64le architecture with Slurm as the process manager. I tried several building options according to the user guide but could not run a job so I have a few questions. Here are things I tried: 1. Build with Hydra PM. I could not launch a job with Hydra at all. 2. Then I decided to use ``--with-pm=none`` option to build and use srun + ``mpiexec -f hostfile`` to launch my job. But what confuses me is the PMI setting: srun --mpi=list gives following: srun: mpi/mpichgm srun: mpi/mpichmx srun: mpi/none srun: mpi/mvapich srun: mpi/openmpi srun: mpi/pmi2 srun: mpi/lam srun: mpi/mpich1_p4 srun: mpi/mpich1_shmem At first I tried use pmix since I found pmix libraries. But it didn't do the trick. It segfaults on PMPI_Init_thread(). The error message is: /[dcs135:2312190] PMIX ERROR: NOT-FOUND in file client/pmix_client.c at line 562/ /Abort(1090831) on node 0 (rank 0 in comm 0): Fatal error in PMPI_Init_thread: Other MPI error, error stack:// //MPIR_Init_thread(159): // //MPID_Init(509).......: // //MPIR_pmi_init(92)....: PMIX_Init returned -46 // //[dcs135:2312190:0:2312190] Caught signal 11 (Segmentation fault: address not mapped to object at address (nil))// / Then I switched to pmi2 but make keeps telling me undefined reference to PMI2 library. (actually I couldn't find the pmi2 libraries either.) Then I used ``--with-pmi=slurm``, and it turned out that I couldn't locate the Slurm header files. I guess I don't have the permission to access them. I was wondering if it is still possible for me to build a usable MPICH as a user? If yes, how can I do to have the PMI work? Thanks! Feimi