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Linux - 如何查看CPU信息与核心数

  • 2026-01-18 15:50:00
Linux - 如何查看CPU信息与核心数
概述
在Linux系统中，查看CPU信息是系统管理、性能调优和软件部署中的常见操作
对于开发人员来说，需要知道CPU信息的场景最常见的就是线程池的线程个数设置
对于CPU密集型任务的线程池的线程个数，计算模板通常为【理想线程数 = CPU核心数 + 1】
对于I/O密集型任务的线程池的线程个数，计算模板通常为【理想线程数 = CPU核心数 * ( 1 + I/O平均等待时间 / CPU平均计算时间 )】
获取CPU逻辑核心数
概述
若我们只是需要知道CPU逻辑核心数，例如用来计算线程池的线程数时，那么使用命令nproc即可最方便快捷获取到我们想要的结果
示例
nproc
获取CPU全面信息
概述
当需要了解CPU的架构层次结构，用于性能调优、资源规划或兼容性判断时，那么可以使用命令lscpu来查看
常用于查看插槽数、物理核心数、逻辑核心数、是否开启超线程、三级缓存大小等
示例
lscpu
查看/proc/cpuinfo文件内容
概述
当想要查看CPU的最原始、详细的完整信息时，可以查看/proc/cpuinfo文件内容
这个文件是CPU信息的最底层了，常用于编写脚本、CPU诊断等
不必记下其中内容，只需要知道其他地方的CPU信息都是从这个文件中采样出来的即可
示例
cat /proc/cpuinfo
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  1. CONNECT:[ UseTime:0.000937s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001320s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000649s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002110s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001399s ]
  6. SELECT * FROM `set` [ RunTime:0.002732s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001494s ]
  8. SELECT * FROM `article` WHERE `id` = 461458 LIMIT 1 [ RunTime:0.001011s ]
  9. UPDATE `article` SET `lasttime` = 1770579909 WHERE `id` = 461458 [ RunTime:0.005769s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000778s ]
  11. SELECT * FROM `article` WHERE `id` < 461458 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001201s ]
  12. SELECT * FROM `article` WHERE `id` > 461458 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001785s ]
  13. SELECT * FROM `article` WHERE `id` < 461458 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005279s ]
  14. SELECT * FROM `article` WHERE `id` < 461458 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007465s ]
  15. SELECT * FROM `article` WHERE `id` < 461458 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.018476s ]
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