I was looking to preconnect all MPI processes to remove some weird behaviors. As I did not remembered the full name I hope to get that from the ompi_info.
$ ompi_info -a -l 9 | grep preco MCA mpi: parameter "mpi_preconnect_all" (current value: "false", data source: default, level: 9 dev/all, type: bool, deprecated, synonym of: mpi_preconnect_mpi) so mpi_preconnect_all is a deprecated synonym to a non-existing parameter. So be it! I then added "mpi_preconnect_mpi = true" to my $(HOME).opemmpi/mca-params.conf file. ompi_info -a -l 9 | grep preco MCA mpi: parameter "mpi_preconnect_all" (current value: "true", data source: file ((null)), level: 9 dev/all, type: bool, deprecated, synonym of: mpi_preconnect_mpi) While the change has been detected, the MCA system somehow got confused to where this change is coming from (the source file is (null)). Not very user friendly. George.