OpenMP: conditional use of #pragma

Question

I\'m using OpenMP to improve my program efficiency on loops.

But recently I discovered that on small loops the use of this library decreased performances and that us

Answer 1

I think you should be able to achieve the effect you're looking for by using the optional schedule clause on your parallel for directive:

#pragma omp parallel for schedule(static, OMP_MIN_VALUE)
 for (unsigned i = 0; i < size; ++i)
   do_some_stuff ();

You might want to play around with different kinds of scheduling though and different chunk sizes to see what suits your library routines best.