[mpich-discuss] communication device selection

[Yida Wang]

Never mind. It looks like that I can pick communication methods by
setting MPIR_CVAR_NEMESIS_NETMOD.

Please let me know if I miss anything.

Thanks!


On Mon, May 26, 2014 at 4:43 PM, Yida Wang <yidawa at gmail.com> wrote:

> 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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