Re: [OMPI users] Problem with MPI_Send and MPI_Recv

Sofia Aparicio Secanellas Wed, 17 Sep 2008 11:44:59 -0400

Hello Terry,

I was trying to do the debug. I was setting all the debugging parameters for the MPI layer. Only with 1 parameter I obtain something different. I enclose the result of the following command:

mpirun --mca mpi_show_mca_params 1 -np 2 --host 10.4.5.123,edu@10.4.5.126 --prefix /usr/local ./PruebaSumaParalela.out



Thanks again.

Sofia

----- Original Message ----- From: "Terry Dontje" <terry.don...@sun.com>

To: <us...@open-mpi.org>
Sent: Wednesday, September 17, 2008 1:24 PM
Subject: Re: [OMPI users] Problem with MPI_Send and MPI_Recv

Sofia,
I took your program and actually ran it successfully on my systems using Open MPI r19400. A couple questions:
1.  Have you tried to run the program on a single node?
mpirun -np 2 --host 10.4.5.123 --prefix /usr/local ./PruebaSumaParalela.out
2. Can you try and run the code the following way and is the output different? mpirun -np 2 --host 10.4.5.123,edu@10.4.5.126 --mca mpi_preconnect_all 1 --prefix /usr/local ./PruebaSumaParalela.out
3. When the program hangs can you attach a debugger to one of the processes and print out a stack?
4. What version of Open MPI are you using, on what type of machine, using which OS?
--td
Date: Tue, 16 Sep 2008 18:15:59 +0200
From: "Sofia Aparicio Secanellas" <sapari...@grpss.ssr.upm.es>
Subject: [OMPI users] Problem with MPI_Send and MPI_Recv
To: <us...@open-mpi.org>
Message-ID: <D99B2E131E0640C9A2A4D8A0FD2472A5@aparicio1>
Content-Type: text/plain; charset="iso-8859-1"

Hello,
I am new using MPI. I want to run a simple program (I enclose the program) in 2 different computers. I have installed MPI in both computers. I have compiled the program using:
mpiCC -o PruebaSumaParalela.out PruebaSumaParalela.cpp
I have copied the executable PruebaSumaParalela.out to my /home directoy in both computers. Then I run:
mpirun -np 2 --host 10.4.5.123,edu@10.4.5.126 --prefix /usr/local ./PruebaSumaParalela.out
The 10.4.5.123 computer prints:

Inicio
Inicio
totalnodes:2
mynode:0
Inicio Recv
totalnodes:2
mynode:1
Inicio Send
sum:375250

The edu@10.4.5.126 computer prints:

Inicio
Inicio
totalnodes:2
mynode:1
Inicio Send
sum:375250
totalnodes:2
mynode:0
Inicio Recv
But the program does not finish on any computer. It seems that the Send and Recv does not work. Master computer is waiting to receive something that the slave does not send.
Do you know what the problem could be ?

Thank you very much.

Sofia

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Re: [OMPI users] Problem with MPI_Send and MPI_Recv

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