HP-MPI Version 1.1 for Windows Release Note

HP-MPI V1.1 for Windows Release Note

Building and running applications

Compiling and running your first application

To quickly become familiar with compiling and running HP-MPI programs, start with the C

version of the hello_world program. This program is called hello_world.c and prints out the

text string "Hello world! I’m r of s on host" where r is a process’s rank, s is the size of the

communicator, and host is the host on which the program is run. The processor name is the

host name for this implementation. HP-MPI returns the hostname for

MPI_Get_processor_name.

The source code for hello_world.c is stored in %MPI_ROOT%\help and is shown below.

#include <stdio.h>

#include "mpi.h"

void main(argc, argv)

int argc;

char *argv[];

{

int rank, size, len;

char name[MPI_MAX_PROCESSOR_NAME];

MPI_Init(&argc, &argv);

MPI_Comm_rank(MPI_COMM_WORLD, &rank);

MPI_Comm_size(MPI_COMM_WORLD, &size);

MPI_Get_processor_name(name, &len);

printf("Hello world!I'm %d of %d on %s\n", rank, size, name);

MPI_Finalize();

exit(0);

}

Building and running on a single host

The example teaches you the basic compilation and run steps to execute hello_world.c on

your local host with 4-way parallelism. To build and run hello_world.c on a local host

named banach1:

Step 1. Change to a writable directory, and copy hello_world.c from the help directory:

> copy "%MPI_ROOT%\help\hello_world.c" .

Step 2. Compile the hello_world executable file.

In a proper compiler command window (e.g. Visual Studio command window), use

mpicc to compile your program: