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Allow UCC to be used with sessions #13311

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@bosilca bosilca commented Jun 22, 2025

And with other instances where OMPI CIDs are not global. In this case, OMPI maintains a translation table for each communicator, but this table is not exposed outside the internal communication infrastructure. So other software layers, such as UCC, are not aware they cannot use the comm cid.

The fix proposed here is to coerced UCC to create a unique ID for the team by itself.

@bfaccini @Sergei-Lebedev

And other instances where OMPI CIDs are not global. In this case, OMPI
maintains a translation table for each communicator, but this tabe is
not exposed to other software layers (such as UCC). As a result UCC
must be coerced to create a unique ID for the team by itself.

Signed-off-by: George Bosilca <[email protected]>
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