TL/UCP: add ranks reordering to allgatherv #819
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* TL/UCP: add ranks reordering to allgatherv * REVIEW: code review fixes
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* TL/UCP: add ranks reordering to allgatherv * REVIEW: code review fixes
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What
Add ranks reordering to allgatherv ring
Why ?
Improves performence
How ?
Sets rank in contiguous manner to exchange as much data as possible between ranks within the same node, minimizing cross node data exchange.