Benjamin, There was no need to open a new thread with the same title and a slightly modified question, it just added some confusion.
If you want to allow oversubscription by default, you can insert the following line in your /etc/openmpi-mca-params.conf (update the path if needed) rmaps_base_oversubscribe = true FWIW you can also do that on a per user basis by adding the same line in $HOME/.openmpi/mca-params.conf last but not least, that can also be achieved via an environment variable export OMPI_MCA_rmaps_base_oversubscribe=true and as already answered, via the command line mpirun --oversubscribe ... Cheers, Gilles On Thu, Jan 25, 2018 at 7:57 AM, Jeff Squyres (jsquyres) <jsquy...@cisco.com> wrote: > Ben -- > > Did you not see Jeff Hammond's reply earlier today? > > https://www.mail-archive.com/users@lists.open-mpi.org//msg31964.html > > >> On Jan 24, 2018, at 5:40 PM, Benjamin Brock <br...@berkeley.edu> wrote: >> >> Recently, when I try to run something locally with OpenMPI with more than >> two ranks (I have a dual-core machine), I get the friendly message >> >> -------------------------------------------------------------------------- >> There are not enough slots available in the system to satisfy the 3 slots >> that were requested by the application: >> ./kmer_generic_hash >> >> Either request fewer slots for your application, or make more slots available >> for use. >> -------------------------------------------------------------------------- >> >> Why is oversubscription now disabled by default when running without a >> hostfile? And how can I turn this off? Is the recommended way to do this >> editing /etc/openmpi/openmpi-default-hostfile? >> >> I'm using default OpenMPI 3.0.0 on Arch Linux. >> >> Cheers, >> >> Ben >> _______________________________________________ >> users mailing list >> users@lists.open-mpi.org >> https://lists.open-mpi.org/mailman/listinfo/users > > > -- > Jeff Squyres > jsquy...@cisco.com > > > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
