How to get CPU info in C on Linux, such as number of cores? [duplicate]

Answer 1

Have you ever seen the output of this shell command "cat /proc/cpuinfo"? I think there you can get out all the information that you need. To read the information in a C program I would prefer the file manipulation functions like fopen, fgets and so on.

Answer 2

Depending on your flavor of Linux you will get different results from /proc/cpuid.

This works for me on CentOS for getting total number of cores.

cat /proc/cpuinfo | grep -w cores | sed -e 's/\t//g' | awk '{print $3}' | xargs | sed -e 's/\ /+/g' | bc

The same doesn't work in Ubuntu. For Ubuntu you can use the following command.

nproc

Answer 3

Parse the file /proc/cpuinfo. This'll give you lot of details about the CPU. Extract the relevant fields into your C/C++ file.