Get a life.... :-)
On Apr 12, 2010, at 11:56 AM, Eugene Loh wrote:
> Ralph Castain wrote:
>
>> On Apr 12, 2010, at 8:42 AM, Eugene Loh wrote:
>>
>>> Ralph Castain wrote:
>>>
>>>> If someone tells us -bind-to-socket, but there is only one socket, then we
>>>> really cannot bind them to anything. Any check by their code would reveal
>>>> that they had not, in fact, been bound - raising questions as to whether
>>>> or not OMPI is performing the request. Our operating standard has been to
>>>> error out if the user specifies something we cannot do to avoid that kind
>>>> of confusion. This is what generated the code in the system today.
>>>>
>>>> Now I can see an argument that -bind-to-socket with one socket maybe
>>>> shouldn't generate an error, but that decision then has to get reflected
>>>> in other code areas as well.
>>>>
>>>> But first we need to resolve the question: should this scenario return an
>>>> error or not?
>>>>
>>> From the onset of the -bind-to-X functionality, -bind-to-board -byboard for
>>> a single-board system would result in binding to everything|nothing -- is
>>> the glass completely full or completely empty? In any case, no error.
>>>
>> Only because we haven't really implemented bind-to-board yet
>>
> Well, we have implemented it. It's accepted by "mpirun" and listed by
> "mpirun --help". So, there's a bug. Shall I fill a trac ticket?
>
>> - once we do (should that happen), then it would indeed generate an error.
>>
>>> Consider a single-board, two-socket, quad-core node and these command lines
>>> with 1.3.4r22104:
>>>
>>> % mpirun -H mynode -n 1 -bycore -bind-to-core -report-bindings ./a.out
>>> % mpirun -H mynode -n 1 -bysocket -bind-to-socket -report-bindings ./a.out
>>> % mpirun -H mynode -n 1 -byboard -bind-to-board -report-bindings ./a.out
>>>
>>> The first binds to "cpus 0001", the second to "socket 0 cpus 000f", and the
>>> third reports no bindings ("bind to everything") and no errors.
>>>
>
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