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doc: add all2all factor
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‎doc/PERFORMANCE.md‎

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@@ -140,5 +140,6 @@ To obtain a bus bandwidth which should be independent of the number of ranks _n_
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* AllGather : (_n_-1)/_n_
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* Broadcast : 1
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* Reduce : 1
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* AlltoAll: (_n_-1)/_n_
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The bus bandwidth should reflect the speed of the hardware bottleneck : NVLink, PCI, QPI, or network.

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