Hi , I have set "yield when idle" in etc/openmpi-mca-params.conf tail openmpi-mca-params.conf plm_rsh_agent = rsh rmaps_base_oversubscribe = 1 hwloc_base_binding_policy = none mpi_yield_when_idle = 1 However the setting seems to be ignored. I get 100 % us 0% sys for processes waiting on MPI calls. But if I set the environment variable: setenv OMPI_MCA_mpi_yield_when_idle 1 or mpirun --mca mpi_yield_when_idle true I get the more expected 15% us 85 % sys. Could someone please check that the setting is read from the configuration file as expected.