coll: add collattr to collective interface #6350
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It is over-complication to use full communicator for the purpose of collective sub-comm. Collectives only need rank, size, and ranklist to carryout the algorithms. We also add the possibility to support multiple levels of subcomm decomposition.
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Replaced by #6590 |
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Pull Request Description
Add and integer attribute,
collattr, to all collective interface to allow more flexible way of decomposing the collective into sub communicator (but without actually creating the full sub-communicator). The actual sub-group information is in theMPIR_Commstruct and initialized at creation time.collattrcan contain an index that points to one of the sub-group. The attribute also can annotate special communication variation, such as making collectives to work with threadcomm (PR #6326). The currenterrflagmechanism is also carried by thecollattr.[skip warnings]
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