Yes, sadly the terminology is badly overloaded at this stage :-(
> On Jul 18, 2016, at 9:20 AM, John Hearns <hear...@googlemail.com> wrote:
>
> Thankyou Ralph. i guess the information I did not have in my head was that
> core = physical core (not hyperthreaded core)
>
> On 18 July 2016 at 14:45, Ralph Castain <r...@open-mpi.org
> <mailto:r...@open-mpi.org>> wrote:
> It sounds like you just want to bind procs to cores since each core is
> composed of 2 HTs. So a simple “--map-by core --bind-to core" should do the
> trick.
>
> FWIW: the affinity settings are controlled by the bind-to <foo> option. You
> can use “mpirun -h” to get the list of supported options and a little
> explanation:
>
> --bind-to <foo>
> Bind processes to the specified object, defaults to core. Supported options
> include slot, hwthread, core, l1cache, l2cache, l3cache, socket, numa, board,
> and none.
>
> https://www.open-mpi.org/doc/current/man1/mpirun.1.php#sect9
> <https://www.open-mpi.org/doc/current/man1/mpirun.1.php#sect9>
>
>
>
>
>> On Jul 17, 2016, at 11:25 PM, John Hearns <hear...@googlemail.com
>> <mailto:hear...@googlemail.com>> wrote:
>>
>> Please can someone point me towards the affinity settings for:
>> OpenMPI 1.10 used with Slurm version 15
>>
>> I have some nodes with 2630-v4 processors.
>> So 10 cores per socket / 20 hyperthreads
>> Hyperthreading is enabled.
>> I would like to set affinity for 20 processes per node,
>> so that the processes are pinned to every second HT core - ie one process
>> per physical thread.
>>
>> I'm sure this is quite easy...
>>
>> Thankyou
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>
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