Is it ok to use libfork with existing openmp project ?

[Frandy]

I'd like to try libfork in my project, while I already use openmp and some library such as openblas which also use openmp.
Will it get conflict？

[ConorWilliams]

There should be no conflicts however, I would not recommend using one within the other i.e. don't spawn OpenMP regions inside libfork coroutines or vice versa as this will spawn too many hardware threads.

Also keep an eye out for the v3 release (you can try the branch out now) this should bring another 2x or more performance.

[Frandy]

Thank you very much for quick reply. It is great.
While I wonder if libfork will keep thread spinning on queue even out of fork region. If so, then it will be conflict with openmp parallel region. But if not, it may suffer thread wakeup overhead.

[ConorWilliams]

With V2 the busy_pool will sleep all threads when no root tasks are running i.e.

busy_pool pool(num_threads);
                                     // All threads are sleeping here.
int fib_10 = pool.schedule(fib(10)); // During the call all threads are awake all the time.
                                     // All threads are back to sleep.

In v3 there is another thread pool lazy_pool which sleeps idle workers when there is not enough work.

[Frandy]

Got it. Thank you very much.