Hello Terry,
Yes, "edu" is the user and 10.4.5.126 is the IP address. Because both
computers have different usernames, I think that I should write the username
otherwise it does not work. In fact, on the computer 10.4.5.123 I write:
mpirun -np 2 --host 10.4.5.123,edu@10.4.5.126 --prefix /usr/local
./PruebaSumaParalela.out
and on the computer 10.4.5.126 I write:
mpirun -np 2 --host sofia@10.4.5.123,10.4.5.126 --prefix /usr/local
./PruebaSumaParalela.out
If I try only with the IP and I write on the computer 10.4.5.123:
mpirun -np 2 --host 10.4.5.123,10.4.5.126 --prefix /usr/local
./PruebaSumaParalela.out
then the computer ask me the password of sofia@10.4.5.126 and then I type
the password and does not work because the user is "edu" not "sofia".
I am trying to install dbx, if I can attach a debugger I will tell you.
Thank you very much.
Sofia
Hello Terry,
Thank you very much for your help.
> 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
>
Yes. In this case, the program works perfectly.
> 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
>
The program also hangs but the output is different. In both computers I
get the following:
Inicio
Inicio
totalnodes:2
mynode:0
Inicio Recv
Ok, so it looks like rank 1 is not getting out of MPI_Init
> 3. When the program hangs can you attach a debugger to one of the
> processes and print out a stack?
>
I do not know how to do that.
With Solaris, I usually do the following:
% dbx - <pid of process>
dbx> where
<stack prints out>
> 4. What version of Open MPI are you using, on what type of machine,
> using which OS?
>
Openmpi-1.2.2 in both computers
In 10.4.5.123 I have:
Ubuntu Linux pichurra 2.6.22-15-generic #1 SMP Tue Jun 10 09:21:34 UTC
2008 i686 GNU/Linux
In edu@10.4.5.126 I have:
K-Ubuntu Linux hp1-Linux 2.6.20-16-generic #2 SMP Sun Sep 23 19:50:39 UTC
2007 i686 GNU/Linux
Sorry for the bonehead question but is edu@10.4.5.126 the actual machine
name? Is its IP address really 10.4.5.126? Can you try that instead? I
would guess the issue is that the tcp btl is somehow not matching the two
nodes as being connected to each other.
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