[OMPI users] MPI_COMM_SPAWN() cannot spawn across nodes

Hi there, I have an issue in OpenMPI 4.0.2 and 4.1.1 that MPI_COMM_SPAWN() cannot spawn across nodes, while I could successfully use this function in OpenMPI 2.1.1 I am testing on a cluster with CentOS 7.9, LSF Batch system, and GCC 6.3.0. I used this code for testing (called it "spawn_examp

Re: [OMPI users] stdout scrambled in file

Open MPI launches a single "helper" process on each node (in Open MPI <= v4.x, that helper process is called "orted"). This process is responsible for launching all the individual MPI processes, and it's also responsible for capturing all the stdout/stderr from those processes and sending it ba