如何在 zsh 或 bash 中获取逻辑 CPU 的数量？

Question

How do I get the # of logical CPUs in zsh or bash? I want to create a makep alias that passes the # of cpus to 'make -j'.

Answer 1

For Linux:

grep -c proc /proc/cpuinfo

The shell doesn't matter. This will work in any.

Answer 2

The simpelst solution is to call "nproc" which just returns the number of logical cores

nproc --all give you all installed processors (on openvz this returns the cpus of the system, not of the maybe limited number in your container!)

nproc without any option gives you the number of cores available to the current process (so bash or zsh in your case) nproc is part of coreutils.

No need to grep :)

For more info see "man nproc"

HTH

Answer 3

On macOS you can do:

sysctl -n hw.ncpu