HP-MPI User's Guide (11th Edition)

Getting started

Getting started using Windows

Chapter 2 31

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

can be seen in “Compiling and running your first application” on page 22.

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 four-way parallelism. To build

and run hello_world.c on a local host named mpiccp1:

Step 1. Change to a writable directory.

Step 2. Open a Visual Studio command window. (This example uses a 64-bit

version, so a Visual Studio x64 command window is opened.)

Step 3. Compile the hello_world executable file:

X:\Demo> "%MPI_ROOT%\bin\mpicc" -mpi64 ^

"%MPI_ROOT%\help\hello_world.c"

Microsoft C/C++ Optimizing Compiler Version 14.00.50727.42 for

x64

hello_world.c

Microsoft Incremental Linker Version 8.00.50727.42

/out:hello_world.exe

"/libpath:C:\Program Files (x86)\Hewlett-Packard\HP-MPI\lib"

/subsystem:console

libhpmpi64.lib

libmpio64.lib

hello_world.obj

Step 4. Run the hello_world executable file:

X:\Demo> "%MPI_ROOT%\bin\mpirun" -np 4 hello_world.exe

where -np 4 specifies 4 as the number of processors to run.

Step 5. Analyze hello_world output.

HP-MPI prints the output from running the hello_world executable in

non-deterministic order. The following is an example of the output:

Hello world! I'm 0 of 4 on mpiccp1

Hello world! I'm 3 of 4 on mpiccp1

Hello world! I'm 1 of 4 on mpiccp1

Hello world! I'm 2 of 4 on mpiccp1