Hi
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
<openlinuxsource@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
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