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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