[mvapich-discuss] Configuration of version 2.3 with TCP fallback?

[Hari Subramoni]

Ok, thanks for the clarification. We will see if such a support can be
enabled in the future.

Regards,
Hari.

On Jun 7, 2017 8:14 AM, "Petr Hanousek" <petr.hanousek at cesnet.cz> wrote:

> Hello Hari,
>
> On 6.6.2017 18:30, Hari Subramoni wrote:
> > Hi,
> >
> > At this point, the default MVAPICH channel cannot use TCP as a
> > fallback if IB fails.
>
> OK, then I solve my issue either with deprecated Nemesis or by compiling
> two versions of MVAPICH. In both cases there should be some logic before
> using the module because of an "error and exit" behavior of Nemesis when
> IB fails.
>
> > Please note that IB is a pretty resilient fabric and it is unlikely to
> > fail. Thus you may never need such a fallback option.
>
> I agree. But I need to use MVAPICH in quite heterogenous grid
> environment. Many different clusters interconnected by a common
> scheduler (PBS Pro). Not every cluster has IB cards or is connected to
> others by them. Therefore I need to have some fallback possibility.
>
> Petr
>
> >
> > On Tue, Jun 6, 2017 at 7:02 AM, Petr Hanousek <petr.hanousek at cesnet.cz
> > <mailto:petr.hanousek at cesnet.cz>> wrote:
> >
> >     Dear all,
> >     in my previous mail I was really "out" when I tried to use
> >
> >     ./configure --prefix=/software/mvapich/2.3/gcc --enable-cxx
> >     --enable-fortran=all --with-pm=hydra --with-device=ch3:mrail:ib,tcp
> >     --enable-pbs-launcher --with-ibverbs=/software/ofed-1.5.4
> >     --enable-shared
> >
> >     After careful read of documentation and some googling around and some
> >     test I assume my --with-device parameter is bad. And it was caused
> by my
> >     misunderstanding of the whole concept. So my question now is if
> mvapich
> >     2.3 can be configured to use IB with TCP fallback if IB fails, when
> >     Nemesis is deprecated?
> >
> >     Cheers Petr
>
> --
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