[Beowulf] slow mpi init/finalize

Peter Kjellström cap at nsc.liu.se
Wed Oct 18 06:40:11 PDT 2017

On Wed, 18 Oct 2017 09:17:53 -0400
Michael Di Domenico <mdidomenico4 at gmail.com> wrote:

> On Wed, Oct 18, 2017 at 9:00 AM, Chris Samuel <samuel at unimelb.edu.au>
> wrote:
> >
> > In that case you're unlikely to be enabling Infiniband support, so
> > you'll need to pass that through to enable it (and you'll need to
> > have the appropriate IB development packages installed too).
> >
> > What does this say?
> >
> > ompi_info  | fgrep openib  
> MCA btl: openib (MCA v2.1.0, API v3.0.0, Component v2.0.2)
> I'm pretty sure openib is getting pulled in by default during the
> configure steps.  i'll have to go back and check the config.log files
> too be sure.  i usually install all the required devel packages and
> it's definitely using RDMA for the message passing.

Yes, not specifying is essentially:

 "build if required devel pkgs available else silently skip"

/Peter K

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