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Subject: Re: [OMPI users] Open MPI program cannot complete
From: Gustavo Correa (gus_at_[hidden])
Date: 2010-10-24 18:09:52


Hi Jack

Your code snippet is too terse, doesn't show the MPI calls.
It is hard to guess what is the problem this way.

Gus Correa
On Oct 24, 2010, at 5:43 PM, Jack Bryan wrote:

> Thanks for the reply.
> But, I use mpi_waitall() to make sure that all MPI communications have been done before a process call MPI_Finalize() and returns.
>
> Any help is appreciated.
>
> thanks
>
> Jack
>
> Oct. 24 2010
>
> > From: gus_at_[hidden]
> > Date: Sun, 24 Oct 2010 17:31:11 -0400
> > To: users_at_[hidden]
> > Subject: Re: [OMPI users] Open MPI program cannot complete
> >
> > Hi Jack
> >
> > It may depend on "do some things".
> > Does it involve MPI communication?
> >
> > Also, why not put MPI_Finalize();return 0 outside the ifs?
> >
> > Gus Correa
> >
> > On Oct 24, 2010, at 2:23 PM, Jack Bryan wrote:
> >
> > > Hi
> > >
> > > I got a problem of open MPI.
> > >
> > > My program has 5 processes.
> > >
> > > All of them can run MPI_Finalize() and return 0.
> > >
> > > But, the whole program cannot be completed.
> > >
> > > In the MPI cluster job queue, it is strill in running status.
> > >
> > > If I use 1 process to run it, no problem.
> > >
> > > Why ?
> > >
> > > My program:
> > >
> > > int main (int argc, char **argv)
> > > {
> > >
> > > MPI_Init(&argc, &argv);
> > > MPI_Comm_rank(MPI_COMM_WORLD, &myRank);
> > > MPI_Comm_size(MPI_COMM_WORLD, &mySize);
> > > MPI_Comm world;
> > > world = MPI_COMM_WORLD;
> > >
> > > if (myRank == 0)
> > > {
> > > do some things.
> > > }
> > >
> > > if (myRank != 0)
> > > {
> > > do some things.
> > > MPI_Finalize();
> > > return 0 ;
> > > }
> > > if (myRank == 0)
> > > {
> > > MPI_Finalize();
> > > return 0;
> > > }
> > >
> > > }
> > >
> > > And, some output files get wrong codes, which can not be readible.
> > > In 1-process case, the program can print correct results to these output files .
> > >
> > > Any help is appreciated.
> > >
> > > thanks
> > >
> > > Jack
> > >
> > > Oct. 24 2010
> > >
> > > _______________________________________________
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> > > users_at_[hidden]
> > > http://www.open-mpi.org/mailman/listinfo.cgi/users
> >
> >
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