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Subject: Re: [OMPI users] Open MPI program cannot complete
From: Jack Bryan (dtustudy68_at_[hidden])
Date: 2010-10-25 02:32:44


thanks
I used:
         cout << " I am rank " << rank << " I am before MPI_Finalize()" << endl; MPI_Finalize(); return 0;
I can get the output " I am rank 0 (1, 2, ....) I am before MPI_Finalize() ".
Are there other better ways to check this ?
Any help is appreciated.
thanks
Jack
Oct. 25 2010
From: solarbikedz_at_[hidden]
Date: Sun, 24 Oct 2010 19:47:54 -0700
To: users_at_[hidden]
Subject: Re: [OMPI users] Open MPI program cannot complete

how do you know all process call mpi_finalize? did you have all of them print out something before they call mpi_finalize? I think what Gustavo is getting at is maybe you had some MPI calls within your snippets that hangs your program, thus some of your processes never called mpi_finalize.

On Sun, Oct 24, 2010 at 6:59 PM, Jack Bryan <dtustudy68_at_[hidden]> wrote:

Thanks,
But, my code is too long to be posted.
What are the common reasons of this kind of problems ?
Any help is appreciated.

Jack
Oct. 24 2010
> From: gus_at_[hidden]
> Date: Sun, 24 Oct 2010 18:09:52 -0400

> To: users_at_[hidden]
> Subject: Re: [OMPI users] Open MPI program cannot complete
>
> 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

> > > >
> > > > _______________________________________________
> > > > users mailing list
> > > > users_at_[hidden]

> > > > http://www.open-mpi.org/mailman/listinfo.cgi/users
> > >
> > >
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>
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