Cargo Features

[dependencies]
private-gemm-x86 = { version = "0.1.20", default-features = false, features = ["std", "rayon"] }
default = rayon, std

These default features are set whenever private-gemm-x86 is added without default-features = false somewhere in the dependency tree.

std default rayon

Enables sysctl ^0.6.0

rayon default = std

Enables crossbeam, rayon, and spindle

private-gemm-x86 has 3 features without comments.