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Subject: Re: [OMPI users] Please help me with this simple setup. i am stuck
From: Luis Vitorio Cargnini (lvcargnini_at_[hidden])
Date: 2009-05-09 12:28:31


maybe add the slots=1 for example to your first node

Le 09-05-09 à 11:42, Venu Gopal a écrit :

> I am venu,
>
> I have tried to setup a simple 2 node openmpi system.
>
> on two machines one is running debian lenny (ip 10.0.3.1)
> other is running ubuntu hardy (ip 10.0.3.3)
>
> I am getting error when i try to execute a file using mpiexec, i am
> sure password is correct. as ssh is working
> and the file pi3 is in directory code which in turn is in my home
> directory venu.
>
> the file pi.c is below
>
>
>
> /* To run this
> program: */
> /
> *---------------------
> */
> /
> *
> */
> /
> *
> */
> /* Issue: time mpirun -np [nprocs] ./pi (SGI,
> Beowulf) */
> /
> *
> */
> /
> *
> */
> /*
> ------------------------------------------------------------------ */
>
> #include <stdio.h>
> #include <stdlib.h>
>
> #include "mpi.h"
>
> int main(int argc, char *argv[])
> {
> int i, n;
> double h, pi, x;
>
> int me, nprocs;
> double piece;
>
> /* --------------------------------------------------- */
>
> MPI_Init (&argc, &argv);
>
> MPI_Comm_size (MPI_COMM_WORLD, &nprocs);
> MPI_Comm_rank (MPI_COMM_WORLD, &me);
>
> /* --------------------------------------------------- */
>
> if (me == 0)
> {
> printf("%s", "Input number of intervals:\n");
> scanf ("%d", &n);
> }
>
> /* --------------------------------------------------- */
>
> MPI_Bcast (&n, 1, MPI_INT,
> 0, MPI_COMM_WORLD);
>
> /* --------------------------------------------------- */
>
> h = 1. / (double) n;
>
> piece = 0.;
>
> for (i=me+1; i <= n; i+=nprocs)
> {
> x = (i-1)*h;
>
> piece = piece + (
> 4/
> (1+(x)*(x))
> +
> 4/
> (1+(x+h)*(x+h))
> ) / 2 * h;
> }
>
> printf("%d: pi = %25.15f\n", me, piece);
>
> /* --------------------------------------------------- */
>
> MPI_Reduce (&piece, &pi, 1, MPI_DOUBLE,
> MPI_SUM, 0, MPI_COMM_WORLD);
>
> /* --------------------------------------------------- */
>
> if (me == 0)
> {
> printf("pi = %25.15f\n", pi);
> }
>
> /* --------------------------------------------------- */
>
> MPI_Finalize();
>
> return 0;
> }
>
>
>
> the code directory is nfs shared and mounted on the client system
> which is 10.0.3.3.
> the server system is 10.0.3.1
>
> i can ping the client from server and also server from client. ssh
> is working bothways.
>
> the /etc/openmpi/openmpi-default-hostfile is having the line on the
> first node ie. 10.0.3.1
>
> 10.0.3.3 slots=2
>
>
> the other nodes file is just empty. i mean only comments are there.
>
>
> this is the error is get when i execute.
>
>
> venu_at_mainframe:~$ mpiexec -np 3 ./code/pi3
> venu_at_10.0.3.3's password:
> --------------------------------------------------------------------------
> Could not execute the executable "./code/pi3": Exec format error
>
> This could mean that your PATH or executable name is wrong, or that
> you do not
> have the necessary permissions. Please ensure that the executable
> is able to be
> found and executed.
>
> --------------------------------------------------------------------------
> --------------------------------------------------------------------------
> Could not execute the executable "./code/pi3": Exec format error
>
> This could mean that your PATH or executable name is wrong, or that
> you do not
> have the necessary permissions. Please ensure that the executable
> is able to be
> found and executed.
>
> --------------------------------------------------------------------------
> --------------------------------------------------------------------------
> Could not execute the executable "./code/pi3": Exec format error
>
> This could mean that your PATH or executable name is wrong, or that
> you do not
> have the necessary permissions. Please ensure that the executable
> is able to be
> found and executed.
>
> --------------------------------------------------------------------------
>
>
>
> now, when i remove that line from /etc/openmpi/openmpi-default-
> hostfile on the first node
>
> the program compiles and executes on the first node node.
>
> same, when i compile it and execute it on the second node, it works.
>
> only problem is when i try to run it on both.
>
> i get the error mesage as above.
>
>
> someone, please help me. as i am trying to setup this system for the
> first time.
>
> and i am stuck.
>
> i am fairly good with linux. so i know my way around linux. but am
> stuck with open mpi.
> --
>
> Regards,
>
> Venu Gopal
>
>
>
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