[OMPI users] Dynamic process allocation hangs

Hello all. Im started some test with Openmpi 4.0.1. I have two machines, one local, the other remote. I have used ssh connection. Some basic test (hello.c script) runs ok local and remote with mpirun. But I need to run a script without mpirun and generate with spawn some processes. Here some exampl

[OMPI users] Program hangs when MPI_Bcast is called rapidly

I have a problem where MPI_Bcast hangs when called rapidly over and over again. This problem manifests itself on our new cluster, but not on our older one. The new cluster has Cascade Lake processors. Each node contains 2 sockets with 18 cores per socket. Cluster size is 128 nodes with an ED