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doc: add all2all factor

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Oren
2024-07-24 22:55:00 -04:00
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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_
* AllGather : (_n_-1)/_n_
* Broadcast : 1
* Reduce : 1
* AlltoAll: (_n_-1)/_n_
The bus bandwidth should reflect the speed of the hardware bottleneck : NVLink, PCI, QPI, or network.