# USE3 Building of Parallel Programs

Building programs that run on an HPC system requires some thought into software, compiling, linking and running.

## Requrements
  * [[skill-tree:use:1:b]]
  * [[skill-tree:use:2:b]]

## Learning objectives
  * Build parallel programs, e.g. via open sources packages.
  * Run parallel programs in an HPC environment.
  * Use a compiler and to assess the effects of optimization switches available for the relevant compilers (e.g. GNU, Intel).
  * Use a linker and to assess the effects of linker specific options and environment variables (e.g. -L and LIBRARY_PATH, -rpath and LD_RUN_PATH).
  * Configure the relevant settings (e.g. by setting compiler and linker options), which determine how the application ought to be built with regard to the parallelization technique(s) used (e.g. OpenMP, MPI).
  * Use software building environments like make, Autotools, CMake.
  * Run parallel programs in an HPC environment.
  * Use a compiler and to assess the effects of optimization switches available for compilers commercially available (e.g. PGI, NAG).
  * Use efficient open-source libraries (e.g. OpenBLAS, FFTW) or highly optimized vendor libraries (e.g. Intel-MKL, IBM-ESSL).
  * Configure the relevant settings (e.g. by setting compiler and linker options), which determine how the application ought to be built with regard to the parallelization technique(s) used (e.g. OpenACC, C++ AMP).
  * Use the profile guided optimization (PGO) technique.
  * Use software building environments like Scons, Waf, make, Autotools, CMake.

## Subskills