Editing Parallel Computing (section)

===OpenMP (internal)===
[https://secure.wikimedia.org/wikipedia/en/wiki/OpenMP OpenMP] is a standard framework for parallel applications on '''shared-memory''' systems. It is supported by the latest versions of [http://gcc.gnu.org/ GCC] and by some other compilers.

To use OpenMP in your program, you do not need to add anything to your SConstruct. Just make sure the OMP libraries are installed on your system before you configure Madagascar, (or -- reinstall them and rerun the configuration command). Of course, you need to use the appropriate pragmas in your code. To find Madagascar programs that use OpenMP and that you can take as a model, run the following command:

<syntaxhighlight lang="bash">
grep "pragma omp" $RSFSRC/*/*/M*.c |\
awk -F ':' '{ print $1 }' |\
uniq |\
awk -F '/' '{ print $NF }' 
</syntaxhighlight>
On the last check (2014-02-09), 139 standalone programs (approximately 11% of Madagascar programs) were using OMP. Running a similar command in the directory <tt>$RSFSRC/api/c</tt> will yield a few library functions parallelized with OMP.