Thank you for the prompt suggestions. But it did not help. The outputs
are just the same as before except that the message comes on separate
lines.
On 2/26/06, Jeff Squyres <jsquyres_at_[hidden]> wrote:
>
> I *think* that you are seeing the canonical parallel output issue --
> that output from different nodes shows up at seemingly random times
> because, at least in part, all nodes are not exactly synchronized.
>
> However, you should probably still see the "Hello world" messages
> from the MPI processes on node-3 (note that you killed node-1, so you
> won't see anything from node-1). These are silly suggestions, but
> try them anyway:
>
> - Output is not guaranteed to be flushed unless you trail the message
> with a \n -- put a \n in your "After final" message.
> - Put a "sleep(1);" before MPI_Finalize to give the output time to
> flush over to mpirun before closing everything down.
>
> I'm sure your application is running properly and that for some
> reason the stdout is not getting flushed over to mpirun.
>
>
> On Feb 24, 2006, at 4:26 AM, Soumya,Teena, Ranjana,Liss,Navya wrote:
>
> > hi,
> >
> >
> > hello.c program is as follows:
> > #include<stdio.h>
> > #include<mpi.h>
> > int main(int argc,char* argv[]){
> > int rank,size;
> > MPI_Init(&argc,&argv);
> > MPI_Comm_rank(MPI_COMM_WORLD,&rank);
> > MPI_Comm_size(MPI_COMM_WORLD,&size);
> >
> > printf("Hello World %d of %d \n",rank,size);
> > MPI_Finalize();
> > printf("After final...");
> > return 0;
> > }
> >
> >
> > Lam-mpi is configured on 4 systems.
> > The command lamnodes gave:
> > n0 master.mec.ac.in:1:origin,this_node
> > n1 node-1.mec.ac.in:1:
> > n2 node-2.mec.ac.in:1:
> > n3 node-3.mec.ac.in:1:
> >
> > When we do mpirun -np 4 a.out after mpicc test.c -lmpi having
> > compiled successfully we are getting the following output:
> > Hello World 0 of 4
> > Hello World 2 of 4
> > After final...Afterfinal...
> >
> >
> > Then we did mpirun -np 8 a.out and got output as follows
> > Hello World 0 of 8
> > Hello World 4 of 8
> > After final...Hello World 2 of 8
> > Hello World 6 of 8
> > After final...After final...After final...
> >
> > Then we did lamshrink n1 .
> > Then mpirun -np 8 a.out
> > Hello World 3 of 8
> > Hello World 1 of 8
> > Hello World 4 of 8
> > Hello World 7 of 8
> > After final...After final...After final...After final...Hello World
> > 0 of 8
> > After final...Hello World 6 of 8
> >
> > It seems that the nodes node-1 and node-3 is not printing any
> > message although communication between the nodes by means of
> > message parsing is taking place and lam is properly installed in
> > all 4 nodes.
> >
> > What could be the reason? Please suggest a solution.
> >
> > Thank u.
> > --
> > CE 2002-06
> > _______________________________________________
> > This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>
>
> --
> {+} Jeff Squyres
> {+} The Open MPI Project
> {+} http://www.open-mpi.org/
>
>
> _______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>
--
CE 2002-06
|
