We cannot reproduce this. On four nodes 20 PPN with and w/o hcoll it takes
exactly the same 19 secs (80 ranks).
What version of HCOLL are you using? Command line?
Josh
On Tue, Feb 4, 2020 at 8:44 AM George Bosilca via users <
users@lists.open-mpi.org> wrote:
> Hcoll will be present in many
Hcoll will be present in many cases, you don’t really want to skip them
all. I foresee 2 problem with the approach you propose:
- collective components are selected per communicator, so even if they will
not be used they are still loaded.
- from outside the MPI library you have little access to
Hi,
George Bosilca writes:
> If I'm not mistaken, hcoll is playing with the opal_progress in a way
> that conflicts with the blessed usage of progress in OMPI and prevents
> other components from advancing and timely completing requests. The
> impact is minimal for sequential applications using
