mmap is used at run time in 19 crates (of which 7 optionally). It is a direct run-time dependency in 9 crates. It's used only as a dev dependency in 6 crates (of which 1 directly).

Depender (with downloads and own rev deps) mmap version
3.5K 10 perfcnt 0.1.*
x86test ^0.1.1
1 easy_mmap ^0.1.1
wfbuf ^0.1
1 cupi *
cylus ^0.1.1
coroutine-rs *
perf-count 0.1.*
remarkable ^0.1.1
fit_no_io dev ^0.1.0