Thank you, Ralph. That's what I was looking for.

Saliya

On Thu, May 19, 2016 at 4:08 PM, Ralph Castain <r...@open-mpi.org> wrote:

> No, it means that each proc will be bound to 4 cores
>
> What you have specified is that you want us to run 3 procs on each socket,
> each proc bound to 4 cores. That is what we will do - as I said, the
> —bind-to socket directive will be ignored.
>
> On May 19, 2016, at 1:03 PM, Saliya Ekanayake <esal...@gmail.com> wrote:
>
> So if bind-to-core is in effect, does that mean it'll run only on 1 core
> even though I'd like it to be able to utilize 4 cores. For examples, I'll
> be creating 4 threads within the process and would like to pin them to each
> core the process has been bound to.
>
> On Thu, May 19, 2016 at 3:46 PM, Ralph Castain <r...@open-mpi.org> wrote:
>
>> Perhaps we should error out, but at the moment, PE=4 forces bind-to-core
>> and so the bind-to socket is being ignored
>>
>> On May 19, 2016, at 12:06 PM, Saliya Ekanayake <esal...@gmail.com> wrote:
>>
>> Hi,
>>
>> I understand --map-by will determine the process placement whereas
>> --bind-to will keep the processes pinned to the given resource. If this
>> understanding is correct, then I've got a doubt with the following.
>>
>> On a node with 2 sockets and 12 cores each,
>>
>> --map-by ppr:3:socket,PE=4  --bind-to socket
>>
>> My understanding is that this will give each process 4 cores. Now, with
>> bind to socket, does that mean it's possible that within a socket the
>> assgined 4 cores for a process may change? Or will they stay in the same 4
>> cores always?
>>
>> Thank you,
>> Saliya
>>
>> --
>> Saliya Ekanayake
>> Ph.D. Candidate | Research Assistant
>> School of Informatics and Computing | Digital Science Center
>> Indiana University, Bloomington
>>
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>>
>>
>>
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>>
>
>
>
> --
> Saliya Ekanayake
> Ph.D. Candidate | Research Assistant
> School of Informatics and Computing | Digital Science Center
> Indiana University, Bloomington
>
> _______________________________________________
> users mailing list
> us...@open-mpi.org
> Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/users
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> http://www.open-mpi.org/community/lists/users/2016/05/29245.php
>
>
>
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>



-- 
Saliya Ekanayake
Ph.D. Candidate | Research Assistant
School of Informatics and Computing | Digital Science Center
Indiana University, Bloomington

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