This feature is now available on the trunk - syntax is "-pernode".
In the absence of the number of procs: "bynode" will launch on all *slots*, with the processes mapped on a bynode basis "byslot" will launch on all *slots*, with procs mapped on a byslot basis. "pernode" will launch one proc/node across all nodes. On 10/7/06 6:57 AM, "Jeff Squyres" <jsquy...@cisco.com> wrote: > Open MPI does not currently have an option to effect this kind of behavior. > It basically assumes that you are going to ask for the right number of slots > for your job. > > I'll file a ticket for a future enhancement to add this behavior. > > > On 10/6/06 11:25 AM, "Maestas, Christopher Daniel" <cdma...@sandia.gov> > wrote: > >> Hello, >> >> I was wondering if openmpi had a -pernode like behavior similar to osc >> mpiexec .... >> mpiexec -pernode mpi_hello >> Would launch N mpi processes on N nodes ... No more no less. >> >> Openmpi already will try and run N*2 nodes if you don't specify -np >> mpirun -np mpi_hello >> Launches N*2 mpi processes on N nodes (when using torque and 2ppn >> specified in your nodes file). This is good. >> >> I tried: >> $ mpirun -nooversubscribe mpi_hello >> [dn172:09406] [0,0,0] ORTE_ERROR_LOG: All the slots on a given node have >> been used in file rmaps_rr.c at line 116 >> [dn172:09406] [0,0,0] ORTE_ERROR_LOG: All the slots on a given node have >> been used in file rmaps_rr.c at line 392 >> [dn172:09406] [0,0,0] ORTE_ERROR_LOG: All the slots on a given node have >> been used in file rmgr_urm.c at line 428 >> [dn172:09406] mpirun: spawn failed with errno=-126 >> >> Here's our env: >> $ env | grep ^OM >> OMPI_MCA_btl_mvapi_ib_timeout=18 >> OMPI_MCA_btl_mvapi_use_eager_rdma=0 >> OMPI_MCA_rmaps_base_schedule_policy=node >> OMPI_MCA_btl_mvapi_ib_retry_count=15 >> OMPI_MCA_oob_tcp_include=eth0 >> OMPI_MCA_mpi_keep_hostnames=1 >> >> This helps us to simply launch scripts to be generic enough to run on >> 1ppn and 2ppn studies pretty easily. >> >> ---- >> echo "Running hello world" >> mpiexec -pernode mpi_hello >> echo "Running hello world 2ppn" >> mpiexec mpi_hello >> --- >> >> Thanks, >> -cdm >> >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users >
