[OMPI users] MPI_Comm_spawn leads to pipe leak and other errors

Dear all, My MPI application spawns a large number of MPI processes using MPI_Comm_spawn over its total lifetime. Unfortunately, I have experienced that this results in problems for all currently supported OpenMPI versions (2.1, 3.0, 3.1 and 4.0). I have written a short, self-contained program

[OMPI users] Rankfile not working

Hi guys, I trying to use the rankfile in OpenMPI 4.1 but it crashes. I got the following message: [genji608:451977] [[64242,0],0] ORTE_ERROR_LOG: Data unpack would read past end of buffer in file base/odls_base_default_fns.c at line 612 I use the following script. It's fine if using the last co