[gmx-users] specifying rank using mpich w/ Dual G4 Mac Cluster
spoel at xray.bmc.uu.se
Fri Dec 20 18:49:58 CET 2002
On Fri, 2002-12-20 at 19:21, DaJustice1 at aol.com wrote:
> Hello all,
> I am trying to use MPICH with a cluster of Dual G4 Macs , and I run into performace problems. I have found that when running mpi with 1 process on the originating computer and 2 processes on 1 other computer with 2 processors the performace is good (specifying 3 nodes -np 3). But when I add in another dual G4 and specify 5 nodes (-np 5), mpi wants to put 2 processes on the originating computer, 2 on the second, and 1 on the third. This causes horrible performace. I have tried to specify 1 processor for the originating computer in the machines file, but mpi still will put two processes on that computer. Is there any way that I can specify the rank, and the number of processes that will be run on each computer? Possibly with -map or some other flag, or is there a better solution possibly with Lam???
with lam you can specify it exactly as you want it.
> Thank you ahead of time,
> gmx-users mailing list
> gmx-users at gromacs.org
> Please don't post (un)subscribe requests to the list. Use the
> www interface or send it to gmx-users-request at gromacs.org.
Dr. David van der Spoel, Biomedical center, Dept. of Biochemistry
Husargatan 3, Box 576, 75123 Uppsala, Sweden
phone: 46 18 471 4205 fax: 46 18 511 755
spoel at xray.bmc.uu.se spoel at gromacs.org http://xray.bmc.uu.se/~spoel
More information about the gromacs.org_gmx-users