I have the next problem: MPI Library, Version 2021.16, initialized with MPI_THREAD_MULTIPLE successfully.
After initialization, create multiple communicators 20, and then create sequentially 20 threads and assign one communicator from previously created. Before assigning communicator& running thread, Barrier() is called. Every thread is doing blocking staff... e.g. Probe(MPI::ANY_SOURCE,....
Now the problem is that Barrier call starts hanging after a number of created threads, e.g.
8 threads are running, the 9th Barrier call hangs, inside
_lll_lock_wai
_pthread_mutex_lock
MPIDI_Progress_test
MPID_Probe
If the threads are not running, Barrier calls are fast.
It seems that separate communicator from threads somehow influence on the Barrier call? Is there some global lock?
Running the same with MPI2018 version works correctly
Thanks
