Dear Ralph, thanks a lot for this valuable advice. Binding now works like expected!
Since adding the ":pe=" option I'm getting warnings
WARNING: a request was made to bind a process. While the system
supports binding the process itself, at least one node does NOT
support binding memory to the process location.
Node: pascal-1-05
...
even if I choose parameters so that binding is like exactly as before without
":pe=". I don't have libnuma installed on the cluster. Might that really be the
cause of the warning?
Thanks a lot, have a nice Easter days
Ado
On 13.04.2017 15:49, r...@open-mpi.org wrote:
> You can always specify a particular number of cpus to use for each process by
> adding it to the map-by directive:
>
> mpirun -np 8 --map-by ppr:2:socket:pe=5 --use-hwthread-cpus -report-bindings
> --mca plm_rsh_agent "qrsh" ./myid
>
> would map 2 processes to each socket, binding each process to 5 HTs on that
> socket (since you told us to treat HTs as independent cpus). If you want us
> to bind to you 5 cores, then you need to remove that --use-hwthread-cpus
> directive.
>
> As I said earlier in this thread, we are actively working with the OpenMP
> folks on a mechanism by which the two sides can coordinate these actions so
> it will be easier to get the desired behavior. For now, though, hopefully
> this will suffice.
>
>> On Apr 13, 2017, at 6:31 AM, Heinz-Ado Arnolds <arno...@mpa-garching.mpg.de>
>> wrote:
>>
>> On 13.04.2017 15:20, gil...@rist.or.jp wrote:
>> ...
>>> in your second case, there are 2 things
>>> - MPI binds to socket, that is why two MPI tasks are assigned the same
>>> hyperthreads
>>> - the GNU OpenMP runtime looks unable to figure out 2 processes use the
>>> same cores, and hence end up binding
>>> the OpenMP threads to the same cores.
>>> my best bet is you should bind a MPI tasks to 5 cores instead of one
>>> socket.
>>> i do not know the syntax off hand, and i am sure Ralph will help you
>>> with that
>>
>> Thanks, would be great if someone has that syntax.
>>
>> Cheers,
>>
>> Ado
>>
>>
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