Hi Al,
this is what I get with your program on my machine:
> lamboot
LAM 7.1.4/MPI 2 C++/ROMIO - Indiana University
> mpirun -v -np 5 mpiTest
14905 mpiTest running on n0 (o)
14906 mpiTest running on n0 (o)
14907 mpiTest running on n0 (o)
14908 mpiTest running on n0 (o)
14909 mpiTest running on n0 (o)
[size is 5 and rank is 4]
[size is 5 and rank is 2]
[size is 5 and rank is 0]
[size is 5 and rank is 1]
[size is 5 and rank is 3]
>
Since the program works fine, I would guess that there may be something
wrong whith your MPI environment. Have you checked that lamboot, mpicc
and mpirun are all taken from the same directory (read: same LAM
version?). Maybe something got mixed up there.
Carsten
Altu 59 wrote:
> Hi Carsten,
>
> I have written a minimal MPI program that does nothing:
>
> #include "mpi.h"
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
>
> int main(int argc, char* argv[]) {
>
> int my_id, other_id, size;
> int length = 1, tag = 1;
> int myvalue, othervalue;
> MPI_Status satus;
>
> MPI_Init(&argc, &argv);
> MPI_Comm_size(MPI_COMM_WORLD, &size);
> MPI_Comm_rank(MPI_COMM_WORLD, &my_id);
>
> printf("\n[size is %d and rank is %d]\n", size, my_id);
>
> MPI_Finalize();
>
> return 0;
> }
>
> I compile it like:
>
> mpicc -Wall -ansi -o mpiTest mpiTest.c
>
> Then I run it with:
>
> mpirun -v -np 5 mpiTest
>
> But it prints
>
> [size is 1 and rank is 0]
> 21168 mpiTest running on n0 (o)
>
> [size is 1 and rank is 0]
> 21169 mpiTest running on n0 (o)
>
> [size is 1 and rank is 0]
> 21170 mpiTest running on n0 (o)
>
> [size is 1 and rank is 0]
> 21171 mpiTest running on n0 (o)
>
> [size is 1 and rank is 0]
> 21172 mpiTest running on n0 (o)
>
> followed by:
>
> -----------------------------------------------------------------------------
> It seems that [at least] one of the processes that was started with
> mpirun did not invoke MPI_INIT before quitting (it is possible that
> more than one process did not invoke MPI_INIT -- mpirun was only
> notified of the first one, which was on node n0).
>
> mpirun can *only* be used with MPI programs (i.e., programs that
> invoke MPI_INIT and MPI_FINALIZE). You can use the "lamexec" program
> to run non-MPI programs over the lambooted nodes.
> -----------------------------------------------------------------------------
>
> Any ideas what probably is the problem?
>
> Regards,
> Al
>
> On 10/10/07, *Carsten Kutzner* <ckutzne_at_[hidden]
> <mailto:ckutzne_at_[hidden]>> wrote:
>
> Altu 59 wrote:
> > Hi,
> >
> > I want to write an MPI program that is comprised of 5 nodes.
> > Can I test this with lam on one machine?
> >
> > How can I create 5 nodes on one machine? Is it even possible?
> Hi Al,
>
> just boot LAM without arguments ('lamboot') and let mpirun know the
> number of processes you want, e.g.
>
> mpirun -np 5 myprog.x
>
> That should do exactly what you want.
> Carsten
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>
>
>
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