[OMPI users] Oversubscribing
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? 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
Re: [OMPI users] Oversubscribing
mpirun --oversubscribe $OTHER_ARGS Jeff On Wed, Jan 24, 2018 at 12:13 PM, Benjamin Brock 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? > > 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 Hammond jeff.scie...@gmail.com http://jeffhammond.github.io/ ___ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
[OMPI users] Oversubscribing When Running Locally
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
Re: [OMPI users] Oversubscribing When Running Locally
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 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
Re: [OMPI users] Oversubscribing When Running Locally
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) 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 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
