[MPICH] running an MPI prog

[Anthony Chan]

Can you run a simple MPI program like cpi in <mpich2-build-dir>/examples ?

cd <mpich2-build-dir>/examples
<mpich2-build-dir>/bin/mpiexec -n 4 cpi

A.Chan

On Thu, 26 Jul 2007 Mark.Donohue at avtechgroup.com wrote:

> Hi yall.  Please help a simpleton with some basic MPICH knowledge.  I am
> trying to run an MPI version of a CFD program that I use regularly.  I
> installed MPICH2 on our Linux cluster, but when I try and run, I get the
> error at the bottom.  I split my computational domain into two
> partitions, and the program complains that the number of partitions (2)
> doesn't equal the number of processors.  Huh?  Is there a way to fix
> this?  I realize that this error is coming from my MPI code and not from
> MPICH itself, but I was hoping to gain some insight into why this is
> happening.  For some reason I thought specifying "-n 2" meant that it
> will begin running with two processors.  All the documentation I've
> found hasn't been able to answer this for me.  Thanks a bunch!
> -Mark
>
>
>
> Aero1% mpiexec -l -machinefile myhosts -n 2 usm3d_52p.mpip4
> Baseline_Elev
> 0: ** WARNING: fp stack is not empty
> 0: ** after call to etime in routine usm52p
> 0:
> 0: ** popping the fp stack and continuing...
> 1: ** WARNING: fp stack is not empty
> 1: ** after call to etime in routine usm52p
> 1:
> 1: ** popping the fp stack and continuing...
> 1: FORTRAN STOP
> 1:  the MPI has been initialized on            1  processors
> 1:   no. of partitions != no. of processors
> 0: FORTRAN STOP
> 0:  the MPI has been initialized on            1  processors
> 0:   no. of partitions != no. of processors
>
>