Hi Raha Yes, that is correct. You have to make sure that max-slots is less or equal to the number of cpus in the node to avoid oversubscribing it.
Have a look at the other entries in the FAQ, they give information on many other options you can use. http://www.open-mpi.org/faq/?category=running Jody On Wed, Feb 26, 2014 at 10:38 AM, raha khalili <khadije.khal...@gmail.com>wrote: > Dear Jody > > Thank you for your reply. Based on hostfile examples you show me, I > understand 'slots' is number of cpus of each node I mentioned in the file, > am I true? > > Wishes > > > On Wed, Feb 26, 2014 at 1:02 PM, jody <jody....@gmail.com> wrote: > >> Hi >> I think you should use the "--host" or "--hostfile" options: >> http://www.open-mpi.org/faq/?category=running#simple-spmd-run >> http://www.open-mpi.org/faq/?category=running#mpirun-host >> Hope this helps >> Jody >> >> >> On Wed, Feb 26, 2014 at 8:31 AM, raha khalili >> <khadije.khal...@gmail.com>wrote: >> >>> Dear Users >>> >>> This is my first post in open-mpi forum and I am beginner in using mpi. >>> I want to run a program which does between 4 systems consist of one >>> server and three nodes with 20 cpus. When I run: *mpirun -np 20 >>> /home/khalili/espresso-5.0.2/bin/pw.x -in si.in <http://si.in> | tee >>> si.out*, after writing htop from terminal, it seems the program doesn't use >>> cpus >>> of three other nodes and just use the cpus of server. Could you tell me >>> please how do I can use all my cpus. >>> >>> Regards >>> -- >>> Khadije Khalili >>> Ph.D Student of Solid-State Physics >>> Department of Physics >>> University of Mazandaran >>> Babolsar, Iran >>> kh.khal...@stu.umz.ac.ir >>> >>> >>> _______________________________________________ >>> users mailing list >>> us...@open-mpi.org >>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>> >> >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users >> > > > > -- > Khadije Khalili > Ph.D Student of Solid-State Physics > Department of Physics > University of Mazandaran > Babolsar, Iran > kh.khal...@stu.umz.ac.ir > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
