Intel® oneAPI Threading Building Blocks (oneTBB) Documentation
A parallel loop construct incurs overhead cost for every chunk of work
that it schedules. oneAPI Threading Building Blocks (oneTBB)
chooses chunk sizes automatically, depending upon load balancing
needs. The heuristic attempts to limit overheads while
still providing ample opportunities for load balancing.
Typically a loop needs to take at least a million clock cycles to
make it worth using
. For example, a loop that takes
at least 500 microseconds on a 2 GHz processor might benefit from
The default automatic chunking is recommended for most uses. As with
most heuristics, however, there are situations where controlling the
chunk size more precisely might yield better performance.