many_cpus is used at run time in 3 crates. It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) many_cpus version
1.0K region_local ^0.3.1
1.0K region_cached ^0.3.1
950 many_cpus_benchmarking ^0.3.1
650 2 linked dev ^0.3.1