"Iliev, Hristo" writes:
> Hi Dave,
>
> Is it MPI_ALLTOALL or MPI_ALLTOALLV that runs slower?
Well, the output says MPI_ALLTOALL, but this prompted me to check, and
it turns out that it's lumping both together.
> If it is the latter,
> the reason could be that the default implementation of MPI_A
Hi Dave,
Is it MPI_ALLTOALL or MPI_ALLTOALLV that runs slower? If it is the latter,
the reason could be that the default implementation of MPI_ALLTOALLV in
1.6.5 is different from that in 1.5.4. To switch back to the previous one,
use:
--mca coll_tuned_use_dynamic_rules 1 --mca coll_tuned_alltoal
