A supervisor with that starts multiple partitions of the same child.
Certain processes may become bottlenecks in large systems.
If those processes can have their state trivially partitioned,
in a way there is no dependency between them, then they can use
the `PartitionSupervisor` to create multiple isolated and
independent partitions.
Once the `PartitionSupervisor` starts, you can dispatch to its
children using `{:via, PartitionSupervisor, {name, key}}`, where
`name` is the name of the `PartitionSupervisor` and key is used
for routing.
José Valim
2ec501e6c1