OpenMP

PiBench uses OpenMP internally for multithreading. The environment variable OMP_NESTED=true must be set to guarantee correctness. Check here for details.

Other environment variables such as OMP_PLACES and OMP_PROC_BIND can be set to control the multithreaded behavior.

For example:

$ OMP_PLACES=cores OMP_PROC_BIND=true OMP_NESTED=true ./PiBench [...]

Note for Clang users: you may need to additionally install OpenMP runtime, on Arch Linux this can be done by installing the package extra/openmp.