coll: add collattr to collective interface #6350
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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_Comm
struct and initialized at creation time.collattr
can 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 currenterrflag
mechanism is also carried by thecollattr
.[skip warnings]
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