Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

Subject: Re: [OMPI users] sending message to the source(0) from other processors
From: Win Than Aung (keshunli_at_[hidden])
Date: 2008-12-23 14:04:04


Hi, thanks for your reply. let's say i have 3 processors. I sent msg from
1st,2nd processors and want to gather in processor 0 processor. so i tried
like following. it couldn't receive msg sent from processor 1 and 2.

http://www.nomorepasting.com/getpaste.php?pasteid=22985

PS: is MPI_Recv is better to receive msg from multiple processors and gather
in 1 processor? or MPI_Gather is better?
thanks
winthan

On Tue, Dec 23, 2008 at 1:23 PM, Eugene Loh <Eugene.Loh_at_[hidden]> wrote:

> Win Than Aung wrote:
>
> MPI_Recv(....) << is it possible to receive the message sent from other
>> sources? I tried MPI_ANY_SOURCE in place of source but it doesn't work out
>>
>
> Yes of course. Can you send a short example of what doesn't work? The
> example should presumably be less than about 20 lines. Here is an example
> that works:
>
> % cat a.c
> #include <stdio.h>
> #include <mpi.h>
>
> int main(int argc, char **argv) {
> int np, me, sbuf = -1, rbuf = -2;
>
> MPI_Init(&argc,&argv);
> MPI_Comm_size(MPI_COMM_WORLD,&np);
> MPI_Comm_rank(MPI_COMM_WORLD,&me);
> if ( np < 2 ) MPI_Abort(MPI_COMM_WORLD,-1);
>
> if ( me == 1 ) MPI_Send(&sbuf,1,MPI_INT,0,344,MPI_COMM_WORLD);
> if ( me == 0 ) {
>
> MPI_Recv(&rbuf,1,MPI_INT,MPI_ANY_SOURCE,344,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
> if ( rbuf == sbuf ) printf("Send/Recv self passed\n");
> else printf("Send/Recv self FAILED\n");
> }
>
> MPI_Finalize();
>
> return 0;
> }
> % mpicc a.c
> % mpirun -np 2 a.out
> Send/Recv self passed
> %
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users
>