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Subject: Re: [OMPI users] Problem with getting started [solved]
From: Rainer Keller (keller_at_[hidden])
Date: 2008-06-12 12:23:00


Hi,
are You sure it was not a Firewall issue on the Suse 10.2?
If there are any connections from the Gentoo machine trying to access the
orted on the Suse, check in /var/log/firewall.

For the time being, try stopping the firewall by (as root) with
/etc/init.d/SuSEfirewall2_setup stop
and test whether it works ,-]

With best regards,
Rainer

On Donnerstag, 12. Juni 2008, Manuel Freiberger wrote:
> Hi!
>
> Ok, I found the problem. I reinstallen OMPI on both PCs but this time only
> locally in the users home directory. Now, the sample code works perfectly.
> I'm not sure where the error really was located. It could be that it was a
> problem with the Gentoo installation because OMPI is still marked unstable
> in portage (~x86 keyword).
>
> Best regards,
> Manuel
>
> On Wednesday 11 June 2008 18:52, Manuel Freiberger wrote:
> > Hello everybody!
> >
> > First of all I wanted to point out that I'm beginner regarding openMPI
> > and all I try to achieve is to get a simple program working on two PCs.
> > So far I've installed openMPI 1.2.6 on two PCs (one running OpenSUSE
> > 10.2, the other one Gentoo).
> > I set up two identical users on both systems and made sure that I can
> > make an SSH connection between them using private/public key
> > authentication.
> >
> > Next I ran the command
> > mpirun -np 2 --hostfile myhosts uptime
> > which gave the result
> > 6:41pm up 1 day 5:16, 4 users, load average: 0.00, 0.07, 0.17
> > 18:43:45 up 7:36, 6 users, load average: 0.00, 0.02, 0.05
> > so I concluded that MPI should work in principle.
> >
> > Next I tried the following code which I copied from Boost.MPI:
> > ---- snip
> > #include <mpi.h>
> > #include <iostream>
> >
> > int main(int argc, char* argv[])
> > {
> > MPI_Init(&argc, &argv);
> > int rank;
> > MPI_Comm_rank(MPI_COMM_WORLD, &rank);
> > if (rank == 0)
> > {
> > std::cout << "Rank 0 is going to send" << std::endl;
> > int value = 17;
> > int result = MPI_Send(&value, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
> > if (result == MPI_SUCCESS)
> > std::cout << "Rank 0 OK!" << std::endl;
> > }
> > else if (rank == 1)
> > {
> > std::cout << "Rank 1 is waiting for answer" << std::endl;
> > int value;
> > MPI_Status status;
> > int result = MPI_Recv(&value, 1, MPI_INT, 0, 0, MPI_COMM_WORLD,
> > &status);
> > if (result == MPI_SUCCESS && value == 17)
> > std::cout << "Rank 1 OK!" << std::endl;
> > }
> > MPI_Finalize();
> > return 0;
> > }
> > ---- snap
> >
> > Starting a parallel job using
> > mpirun -np 2 --hostfile myhosts mpi-test
> > I get the answer
> > Rank 0 is going to send
> > Rank 1 is waiting for answer
> > Rank 0 OK!
> > and than the program locks. So the strange thing is that obviously the
> > recv()-command is blocking, which is what I do not understand.
> >
> > Could anybody provide some hints, where I should start looking for the
> > mistake? Any help is welcome!
> >
> > Best regards,
> > Manuel

-- 
----------------------------------------------------------------
Dipl.-Inf. Rainer Keller   http://www.hlrs.de/people/keller
 HLRS                          Tel: ++49 (0)711-685 6 5858
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