It works after creating a new pe and even from the command prompt with out using SGE. Thanks Rangam ________________________________________ From: users-boun...@open-mpi.org [users-boun...@open-mpi.org] On Behalf Of Reuti [re...@staff.uni-marburg.de] Sent: Tuesday, March 02, 2010 12:35 PM To: Open MPI Users Subject: Re: [OMPI users] Option to use only 7 cores out of 8 on each node
Am 02.03.2010 um 19:26 schrieb Eugene Loh: > Eugene Loh wrote: > >> Addepalli, Srirangam V wrote: >> >>> i tried using the following syntax with machinefile >>> mpirun -np 14 -npernode 7 -machinefile machinefile ven_nw.e >>> <coll.dt5 >> >> It "works" for me. I'm not using SGE, though. When it's tightly integrated with SGE, maybe you need a PE with a fixed allocation rule of 7. Then all should work automatically and without any need of a machinefile for mpiexec. If you want to use the node exclusively for your job although you want only 7 out of 8 available slots, you also need to request an exclusive resource (e.g. named "exclusive") which is attached to each exechost. -- Reuti >> >> % cat machinefile >> % mpirun -tag-output -np 14 -npernode 7 -machinefile machinefile >> hostname > > Incidentally, the key ingredient here is the "-npernode 7" part. > The machine file only needs enough slots. E.g., you could have had: > > % cat machinefile > node0 slots=20 > node1 slots=20 > > mpirun will see that there are enough slots on each node, but load > only 7 up per node due to the -npernode switch. > > That said, I don't know what's going wrong in your case -- only > that things work as advertised for me. > _______________________________________________ > 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
