https://blog.faceutil.com/2020/07/10/%ed%95%98%eb%93%9c%ec%9b%a8%ec%96%b4-%ec%83%81%ed%83%9c-%ec%b2%b4%ed%81%ac-cpu-%ec%98%a8%eb%8f%84-%ed%99%95%ec%9d%b8-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%a8-%eb%ac%b4%ec%84%a4%ec%b9%98-%ed%8f%ac/