[mpich-discuss] MPI_Recv problem

Soheil Hooshdaran shooshdaran577 at gmail.com
Mon Dec 2 08:06:06 CST 2013


What should I use?

Even the statement right after MPI_Sent doesn't execute. My code has
something like this:
//////////////////////in the root process
 while(i<iWorldSize)
    {
cout << "executing send for the " << i << "th time" <<  endl;
   MPI_Send( A[i], n/iWorldSize * m, MPI_INT, i, itag, MPI_COMM_WORLD );
   sent++;
   cout << "executed send for the " << i << "th time, sending " <<
         n/iWorldSize * m << " bytes to processor " << i << endl;

   i+=n/iWorldSize;
   }//end while


////////////////////in the slave process
      while(sent)
      {
  cout << "**********sent= " << sent << endl;
  cout << "\n\n\n**********Executing receive*******" << endl;
  MPI_Recv(&buffer, n/iWorldSize*m, MPI_INT, 0, itag, MPI_COMM_WORLD,
&status);
  sent=0;
  cout << "**********receive executed***********" << endl;
  }


On Mon, Dec 2, 2013 at 5:21 PM, Pavan Balaji <balaji at mcs.anl.gov> wrote:

>
> Did you try printing how many bytes you are receiving before calling
> MPI_Recv?
>
>   — Pavan
>
> On Dec 1, 2013, at 11:43 PM, Soheil Hooshdaran <shooshdaran577 at gmail.com>
> wrote:
>
> > Hello. Please tell me what is wrong with my program that it doesn't goes
> no further than  executing MPI_Send() for the first time.
> > The file is attached
> >
> >
> > On Sat, Nov 30, 2013 at 7:02 PM, Soheil Hooshdaran <
> shooshdaran577 at gmail.com> wrote:
> > So what do I have to do now, sir? Especially regarding my Bcast()s a,d
> Recv()s
> >
> >
> > On Sat, Nov 30, 2013 at 1:05 AM, Pavan Balaji <balaji at mcs.anl.gov>
> wrote:
> >
> > Please keep discuss at mpich.org cc’ed.
> >
> > On Nov 29, 2013, at 2:19 PM, Soheil Hooshdaran <shooshdaran577 at gmail.com>
> wrote:
> > > executing send for the 3th time
> > > executed send for the 3th time, sending 40 bytes
> > > Fatal error in MPI_Recv: Message truncated, error stack:
> > > MPI_Recv(184).....................: MPI_Recv(buf=0xbff95c98, count=0,
> MPI_INT, src=0, tag=1, MPI_COMM_WORLD, status=0xbff95c70) failed
> > > MPIDI_CH3U_Receive_data_found(131): Message from rank 0 and tag 1
> truncated; 160 bytes received but buffer size is 0
> >
> > I don’t think I can explain the error any better than what the message
> above already says.
> >
> > --
> > Pavan Balaji
> > http://www.mcs.anl.gov/~balaji
> >
> >
> > <p1_Hooshdaran_static[debug].cpp>
>
> --
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji
>
>
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