Hi all, Say I have some int `x`. I want to check if all MPI ranks get the same value for `x`. What's a good way to achieve this using MPI collectives?
The simplest I could think of is, broadcast rank0's `x`, do the comparison, and allreduce-LAND the comparison result. This requires two collective operations. ```python ... x = ... # each rank may produce different values for x x_bcast = comm.bcast(x, root=0) all_equal = comm.allreduce(x==x_bcast, op=MPI.LAND) if not all_equal: raise Exception() ... ``` Is there a better way to do this? -- Niranda Perera https://niranda.dev/ @n1r44 <https://twitter.com/N1R44>
