http://www.pathscale.com/ekopath.html.

GNU Parallel Make

The GNU parallel Make command is used whenever the make command is invoked. GNU parallel Make provides the ability to do a parallel Make; however, all compiling takes place on the login node. Therefore, whether a parallel make improves build time depends upon how many cores are on the login node and the load on the login node.

Information about using the GNU parallel Make is provided in "Using the GNU Parallel Make Capability" .

For further information about using GNU parallel Make, refer to the make manpage. For additional sources of GNU information, refer to the references provided in the front of this manual, located in About This Document.

MKL Library

MKL is a math library that references pthreads, and in enabled environments, can use multiple threads. MKL can be linked in a single-threaded manner with your application by specifying the following in the link command:

•On the CP3000 and CP4000 platforms (as appropriate):

-L/opt/intel/mkl70/lib/32 -lmkl_ia32 -lguide -pthread-L/opt/intel/mkl70/lib/em64t -lmkl_em64t -lguide -pthread

•On the CP6000 platforms:

-L/opt/intel/mkl70/lib/64 -lmkl_ipf -lguide -pthreadACML Library

You can use the AMD Core Math Library (ACML library) on the CP4000 platform.

Other Libraries

Other libraries can be used as they would on any other system. However they must contain single core routines and have no dependencies on another message passing system.

Building Parallel Applications

This section describes how to build MPI and non-MPI parallel applications on an HP XC system.

Compiling and Linking Non-MPI Applications

If you are building non-MPI applications, such as an OpenMP application for example, you can compile and link them on an HP XC as you normally would, with standard header files and switches.

Compiling and Linking HP-MPI Applications

This section provides some general information about how to build an HP-MPI application in the HP XC environment.

Compiling and linking an MPI application on an HP XC system is performed by invoking the HP-MPI compiler utilities. HP-MPI compiler utilities are scripts supplied by HP-MPI to make it easier to invoke a compiler with the appropriate libraries and search paths. The HP-MPI compiler utilities add all the necessary path locations and library specifications to the compile and link steps that are required to build a HP XC parallel application. It is highly recommended that you use the HP-MPI compiler utilities to compile and link your MPI application on an HP XC cluster, rather than invoke a compiler directly.

The mpicc, mpic++, mpif90, and mpif77 MPI compiler commands are used to invoke the HP-MPI compiler utilities that compile and link an MPI application. The mpicc and mpic++ commands invoke the drivers of the C and C++ compilers. The mpif77 and mpif90 commands invoke the drivers of the Fortran 77 and Fortran 90 compilers.

Before you can compile and link an MPI program using the MPI compiler commands, the MPI compiler utilities module (mpi) must be loaded by using the module load mpi command, or you must arrange for them to be in your $PATH search list. The use of modules is described in "Overview of Modules" .

42 Developing Applications