[mpich-discuss] communication device selection

[Yida Wang]

Hi Pavan,

Thanks for letting me know. One follow-up (maybe silly) question, how can I
pick tcp at runtime instead of scif?

Yida


On Mon, May 26, 2014 at 3:06 PM, Balaji, Pavan <balaji at anl.gov> wrote:

> Hi Yida,
>
> Using SCIF + TCP (+ shared memory, which is implicit) together within the
> same job is not supported right now.  When you configure with scif,tcp, you
> can pick either one at runtime, but not both.
>
> We are working on some improvements to this for the next major release
> (3.2).  Please stay tuned.
>
> Regards,
>
>   — Pavan
>
> On May 26, 2014, at 10:50 AM, Yida Wang <yidawa at gmail.com> wrote:
>
> > Hi Guys,
> >
> > During configuration, I put in an optional argument as
> "--with-device=ch3:nemesis:scif,tcp" to hopefully enable scif communication
> through PCIe, and use tcp for remote communication.
> >
> > However, it looks like that tcp channel is disabled by this setting.
> That is, when I wanted to communicate between remote Xeon Phis, it returned
> error saying that "channel initialization failed" and "scif_connect
> failed", where I assume that tcp channel should be used instead of scif.
> >
> > Moreover, when communicating between two remote hosts, it would get
> stuck probably because it still tried to use scif channel.
> >
> > Did I configure the communication device incorrectly?
> >
> > Thanks,
> > YW
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