Steffen -- What version of Open MPI are you using?
> On Apr 16, 2019, at 9:21 AM, Steffen Christgau <christ...@cs.uni-potsdam.de> > wrote: > > Hi Tim, > > it helps, up to four processes. But it has two drawbacks. 1) Using more > cores/threads than the machine provides (so the actual > over-subscription) is still not possible. 2) it still requires an > additional command line argument. > > What I'd like to see is that a call of mpirun with an arbitrary number > of processes that just works without any other command line options. > However, an environment variable would be acceptable. > > MPICH's (v3.3) mpirun of a plain installation with no further configure > options (I think it uses the Hydra PM) just does what I want, but MPICH > is not always an option ;-) > > Regards, Steffen > > On 16/04/2019 14.56, Tim Jim wrote: >> Hi Steffen, >> >> I'm not sure if this will help you (I'm by far no expert) but the >> mailing group pointed by to using: >> mpirun --use-hwthread-cpus >> >> to solve something similar. >> >> Kind regards, >> Tim >> >> >> On Tue, 16 Apr 2019 at 19:01, Steffen Christgau >> <christ...@cs.uni-potsdam.de <mailto:christ...@cs.uni-potsdam.de>> wrote: >> >> Hi everyone, >> >> on my 2 cores/4 threads development platform I want to start programs >> via mpirun with over-subscription enabled by default. I have some >> external packages which have tests that use more than 2 processes. They >> all fail because Open MPI refuses them to run due to over-subscription. >> I know that I can enable over-subscription with mpirun --oversubscribe >> and that works well, but that would require to modify the packages' >> autotools files or the generated Makefiles with I found hardly >> convenient. >> >> I also tried two of the RMAPS MCA parameters: >> >> - rmaps_base_no_oversubscribe >> - rmaps_base_oversubscribe >> >> (btw, are they redundant? Having two of them and one is the negation of >> the other is quite confusing. The description in ompi_info reads quite >> similar for the two.) >> >> $ mpirun --mca rmaps_base_no_oversubscribe 0 --mca >> rmaps_base_oversubscribe 1 -n 4 hostname >> -------------------------------------------------------------------------- >> There are not enough slots available in the system to satisfy the 4 >> slots that were requested by the application: >> hostname >> >> Either request fewer slots for your application, or make more slots >> available for use. >> -------------------------------------------------------------------------- >> >> Setting the environment variables (OMPI_MCA_rmaps_...) did not help >> either. The same goes or the FAQ [1]: >> >> $ cat > my-hostfile >> localhost >> $ mpirun -np 4 --hostfile my-hostfile hostname >> -------------------------------------------------------------------------- >> There are not enough slots available in the system to satisfy the 4 >> slots... >> >> My Open MPI installation is a private build of version 4.0.0, configured >> with nothing more than ./configure --prefix=/some/where >> --enable-mpi-fortran >> >> How can I allow over-subscription by default? I am aware about >> performance implications, but it's only used for testing and >> development. I am not using a resource manager on that machine. >> >> Thanks in advance >> >> Regards, Steffen >> >> [1] https://www.open-mpi.org/faq/?category=running#oversubscribing >> >> _______________________________________________ >> users mailing list >> users@lists.open-mpi.org <mailto:users@lists.open-mpi.org> >> https://lists.open-mpi.org/mailman/listinfo/users >> >> >> >> -- >> >> >> >> *Timothy Jim >> */PhD Researcher in Aerospace/ >> >> Creative Flow Research Division, >> Institute of Fluid Science, Tohoku University >> >> www.linkedin.com/in/timjim/ <http://www.linkedin.com/in/timjim/> >> >> >> _______________________________________________ >> 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 -- Jeff Squyres jsquy...@cisco.com _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
