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[Doc] Placement group doc small update (#12594)

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* Modify doc  that wasn't supposed to be merged.

* Addressed coder eview.
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SangBin Cho
2020-12-07 13:58:27 -08:00
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parent 3ee4612696
commit 040cf2c13b
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doc/examples/placement-group.rst
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@@ -28,9 +28,10 @@ Gang Scheduling
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**Recommended Strategy**: `STRICT_SPREAD`.
Sometimes, you'd like to schedule multiple tasks/actors in a separate physical machine (node) "at the same time". For example, "write the gang scheduling example".
Sometimes, you'd like to schedule multiple tasks/actors in a separate physical machine (node) "at the same time". For example, you may use a collective communication library like NCCL and form a communication group with a set of actors. In creating this set of actors, you may want to ensure that all actors are separated and placed evenly across available nodes (creating a homogenous cluster).
You can use placement groups' `STRICT_SPREAD` strategy to achieve it. `STRICT_SPREAD` ensures that all actors and tasks scheduled with the placement group will be located in a separate node.
Also, since the placement group creation is atomic, you can always guarantee that tasks and actors are scheduled at the same time.
Improve Fault tolerance
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