Open MPI - mpirun exits with error on simple program

Question

I have recently installed OpenMPI on my computer and when I try to run a simple Hello World program, it exits with the next error:

-------------------------------------------------------
Primary job  terminated normally, but 1 process returned
a non-zero exit code.. Per user-direction, the job has been aborted.
-------------------------------------------------------

This is the program's source code:

#include <mpi.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
    int size, rank;

    MPI_Init(&argc, &argv);
    MPI_Comm_size(MPI_COMM_WORLD, &size);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);

    printf("Hello\n");

    MPI_Finalize();

    return 0;
}

This is how I compile the program:

mpicc -o hello hello.c

and I execute it with

mpirun -np 2 hello

It throws no errors on compilation, and if I run ./hello, it runs ok.

Excuse my english, any correction will be welcome.

Wellmeaning

Make sure you are using the same MPI distribution (OpenMPI, MPICH, MVAPICH) and version for compiling with mpicc and running the program mpirun. Your error could very well be caused my a mismatch in version and or distribution. – Informed

I've downloaded and installed the last stable version of OpenMPI. Before the install, I had no version of MPI installed – Wellmeaning

check the return values. – Polyp

You mention that you used the last stable version but which version is that? – Prokopyevsk

This seems to be the same error. The answer below with ./ should work. – Avina

Answer 1

you have to ./ the executable name try this, mpirun -np 2 ./hello

Cullen

Answer 2

Try:

mpirun -x LD_PRELOAD=libmpi.so -np 2 hello

If it works, you probably have an issue with your OpenMPI installation. A simple workaround would be to define an alias. If ou use bash, add in ~/.bashrc:

alias mpirun='mpirun -x LD_PRELOAD=libmpi.so' 

Punctilious