OpenMP_demo package includes simple OpenMP benchmarks and demos.
OpenMP (Open Multi-Processing) is a standard API that supports multi-platform shared memory multiprocessing programming in C and C++.
It does not require libraries as it is directly supported by all main compilers. See Project/Package organizer and include file for details.
More OpenMP info in FAQ here.
Benchmarks and demos are:
Pi Pi number benchmark
Matrix NxN matrix product benchmark