HP-MPI Version 2.2 for HP-UX Release Note

HP-MPI V2.2 for HP-UX Release Note

What’s in This Version

c The bytes of shared memory for other generic use, such as

MPI_Alloc_mem() call. The default is 87.5% of the total memory.

Running Applications

Set the following environment variables:

• If you choose to move the HP-MPI installation directory from its default location in

/opt/mpi, set the MPI_ROOT environment variable to point to the location where HP-MPI

is installed.

•Add $MPI_ROOT/bin to PATH.

•Add $MPI_ROOT/share/man to MANPATH.

NOTE HP-MPI must be installed in the same directory on every execution host.

The following is an example of basic compilation and run steps to execute hello_world.c on

a cluster with 4-way parallelism given the ability to remsh/ssh between hosts. To build and

run hello_world.c on a cluster using an appfile:

• Change to a writable directory that is visible on all hosts from which the job will run.

• Compile the hello_world executable file:

% $MPI_ROOT/bin/mpicc -o hello_world $MPI_ROOT/help/hello_world.c

• Create a file "appfile" as:

-h n01 -np 2 /path/to/hello_world

-h n02 -np 2 /path/to/hello_world

• Run the hello_world executable file:

% $MPI_ROOT/bin/mpirun -f appfile

By default, mpirun will remsh to the remote machines n01 and n02. If desired, the

environment variable MPI_REMSH can be used to specify a different command, such as

/usr/bin/ssh or "ssh -x".

•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 1 of 4 on n01

Hello world!I’m 3 of 4 on n02

Hello world!I’m 0 of 4 on n01

Hello world!I’m 2 of 4 on n02