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August 11, 2025 20:47
Creating CSEL constants array for the string name of collective and comm hierarchy. These string values will be used during parsing of the JSON file, and printing of the CSEL tree node. Separating the implementation details CSEL tree printing function for the ease of maintenance.
Consolidate the POSIX coll algorithm enum definition under MPII. The JSON parsing no longer need separate functions for them.
Consolidate the CH4 coll algorithm enum definition under MPII. The JSON parsing no longer need separate functions for them.
Consolidate the OFI coll algorithm enum definition under MPII. The JSON parsing no longer need separate functions for them.
Creating internal function for creating, freeing and updating CSEL tree node. They are used to manipulating tree struction in future CSEL optimizations.
MPIR_CVAR_COLLECTIVE_SELECTION_REPORT controls how MPICH show the collective selection logic during init. It is turned off by default. The user can choose to print the CSEL in tree format or summary format (later commit).
The ANY node is needed in CSEL as the catch-all condition logically. Keeping the actual ANY node in the tree add additional pointer deference with no benefits. This commit will squash all ANY nodes during CSEL tree inititalization.
The LT conditions are internally converted to less-than-or-equal (LE). The LT conditions are redundant since it can always be represented in LE conditions. Having both of them complicates the logical and can create holes in matching ranges. It is deprecated in this PR, and only kept for backward compatibility.
Merging multple LE condition nodes into a single node for matching. LE conditions are stored in a sorted range-set which enables binary search when matches a value against these conditions.
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