Hi http://www.open-mpi.org/faq/?category=tuning#using-paffinity I am not familiar with this cluster, but in the FAQ ( see link above ) you can find an example of the rankfile. another simple example is the following: $cat rankfile rank 0=host1 slot=0 rank 1=host2 slot=0 rank 2=host3 slot=0 rank 3=host4 slot=0 $mpirun -np 4 -H host1,host2,host3,host4 -rf rankfile ./app if you OS sees your cluster as a one machine and $cat /proc/cpuinfo shows 4 CPUs ( let's assume 0-3 ) and one IP and hostname, then try this: $cat rankfile rank 0=host1 slot=0 rank 1=host1 slot=1 rank 2=host1 slot=2 rank 3=host1 slot=3 $mpirun -np 4 -H host1 -rf rankfile ./app best regards Lenny.
On Fri, Aug 14, 2009 at 6:50 AM, Lee Amy <openlinuxsou...@gmail.com> wrote: > HI, > > I read some howtos at OpenMPI official site but i still have some problems > here. > > I build a Kerrighed Clusters with 4 nodes so they look like a big SMP > machine. every node has 1 processor with dingle core. > > 1) Dose MPI programs could be running on such kinds of machine? If > yes, could anyone show me some examples? > > 2) In this SMP machine there are 4 processors I could see. So how do I > use OpenMPI to run some programs on these CPUs? Though I read how to > make a rank file but I am still feel confused. Could anyone show me a > simple rank file example for my Clusters? > > Thank you very much. > > Regards, > > Amy Lee > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
