There is an ongoing discussion about this on issue #4067 (
https://github.com/open-mpi/ompi/issues/4067). Also the mailing list
contains few examples on how to tweak the collective algorithms to your
On Thu, Jun 6, 2019 at 7:42 PM hash join via users
> Hi all,
> I want to use the MPI_Allreduce to synchronize results from all the
> But I want to know the background algorithm to implement Allreduce. When I
> check the coll base of MPI_Allreduce:
> There are implementations like:
> ompi_coll_base_allreduce_intra_ring..etc. So how can I know which exact
> implement I am using when I use MPI_Allreduce. Or can I configure these?
> For example, I only want to use ring allreduce. How should I configure it?
> users mailing list
users mailing list