[mpi3-coll] [Mpi-forum] MPI_Comm_create_group Meeting

[Jim Dinan]

Hi All,

This is a quick reminder to fill out the doodle poll for those 
interested in MPI_Comm_create_group().  I'd like to hold the meeting at 
the beginning of next week.

http://www.doodle.com/yx5b2f5f5hwc2qzq

  ~Jim.


On 12/7/11 1:57 PM, Jim Dinan wrote:
> Hi All,
>
> I've updated the text with feedback from the last meeting, adding text
> to define a collective tag space. Please take a look at the ticket286
> edits in the attached PDF and send any feedback.
>
> Also, I'd like to have another conference call early next week to
> discuss and get ready for a reading in January. Please fill in your
> availability on the doodle poll:
>
> http://www.doodle.com/yx5b2f5f5hwc2qzq
>
> Thanks,
> ~Jim.
>
> On 11/8/11 3:57 PM, James Dinan wrote:
>> Hi All,
>>
>> Notes from yesterday's meeting are attached. Please note that we are
>> moving all future discussion of this ticket to the mpi3-coll mailing
>> list.
>>
>> Best,
>> ~Jim.
>>
>> In attendance:
>>
>> Adam Moody, David Goodell, Jim Dinan, Pavan Balaji, Fab Tiller, Bronis
>> de Supinski, Jeff Hammond
>>
>> Item 1: Name of the routine.
>>
>> We decided to stick with MPI_Comm_create group as the best way of
>> matching the MPI_CLASS_ACTION_SUBSET naming convention.
>>
>> Item 2: Tag versus color.
>>
>> We decided to use a tag, which is defined to be in a collective tag
>> space that is distinct from the point-to-point tag space. The collective
>> tag will follow all MPI tag semantics, however it will not conflict with
>> any point-to-point tags (including MPI_ANY_TAG). This essentially
>> exposes the expected implementation in the standard, providing more
>> flexible semantics to the user. In addition, it allows an implementation
>> to make more efficient use of the tag space by defining tag conflicts
>> across tagged collective operations (currently only MPI_Intercomm_create
>> and MPI_Comm_create_group, but we could define others in the future).
>>
>> In a separate ticket, we can update MPI_Intercomm_create to specify that
>> its tag is also in the collective tag space. This will be backward
>> compatible, but will make MPI_Intercomm_create considerably easier to
>> use because its tags will no longer conflict with point-to-point
>> operations.
>>
>> Tasks:
>>
>> * Jim will work on a revision of the text that follows the above
>> semantics.
>>
>> * The group will reconvene after Thanksgiving to review new text.
>>
>> * The group will move discussion to the collectives mailing list.
>>
>>
>> On 11/4/11 11:07 AM, James Dinan wrote:
>>> Based on the doodle poll, it looks like Monday at 3pm CT will be the
>>> best time to meet. We'll use the hybrid WG telecon bridge:
>>>
>>> Domestic dial number: 866-654-6744
>>> International dial number: 517-308-8226
>>> Passcode: 6086006
>>>
>>> See you then,
>>> ~Jim.
>>>
>>> On 11/1/11 2:33 PM, James Dinan wrote:
>>>> Hi All,
>>>>
>>>> I would like to form a group to review the MPI_Comm_create_group()
>>>> proposal (#286) for a formal reading at the next Forum meeting. If you
>>>> are interested in joining the discussion, could you please fill in your
>>>> availability for a one hour conference call next week:
>>>>
>>>> http://www.doodle.com/9tganzq2hqiqy7kt
>>>>
>>>> We have a couple issues to discuss:
>>>>
>>>> 1.) The name of the function: MPI_Comm_create_group,
>>>> MPI_Group_comm_create, MPI_Comm_create_from_group, ...
>>>>
>>>> 2.) The tag argument: Should we use a tag or a "color" to establish a
>>>> safe communication conduit on the parent communicator. As discussed at
>>>> the Forum, using a tag could conflict with the use of MPI_ANY_TAG on
>>>> the
>>>> parent communicator. A color would avoid this issue, however it could
>>>> complicate tag matching.
>>>>
>>>> 3.) Changes to the text.
>>>>
>>>> Thanks,
>>>> ~Jim.
>>>>
>>>> PS- I've attached a copy of the current text with comments from the
>>>> formal reading at the last Forum meeting (in Acrobat: Comments ->
>>>> Comments View -> Show Comments List for the full list).
>>>>
>>>>
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