The OpenMP Application Program Interface API
supports multi-platform Shared memory Multiprocessing
programming for in C
on many architectures, including Unix
platforms and Windows
Jointly defined by a group of major computer hardware and software vendors, OpenMP is a portable, scalable model that gives programmers a simple and flexible interface for developing parallel applications for platforms ranging from the desktop to the supercomputer.
Often a so-called mixed-mode parallel programming, using both OpenMP and MPI (Message Passing Interface), is used for programming Computer clusters.