I have the simplest code "Hello world"
#include <stdio.h> /* printf and BUFSIZ defined there */
#include <stdlib.h> /* exit defined there */
#include <mpi.h> /* all MPI-2 functions defined there */
int main(argc, argv)
int argc;
char *argv[];
{
int rank, size, length;
char name[BUFSIZ];
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Get_processor_name(name, &length);
printf("%s: hello world from process %d of %d\n", name, rank, size);
MPI_Finalize();
exit(0);
}
I have compiled it
mpicc -o hello hello.c
and tried to run it with 4 processes
mpirun -np 4 hello
it returns;
chasan@ubuntu:~/MpiProgrammes$ mpicc -o hello Hello.c
chasan@ubuntu:~/MpiProgrammes$ mpirun -np 4 hello
Alarm clock
chasan@ubuntu:~/MpiProgrammes$
What could it be ?