查看cpu频率

sudo apt-get install cpufrequtils

$ cpufreq-info
                  
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 4294.55 ms.
  hardware limits: 1.20 GHz - 3.50 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 1.20 GHz and 3.50 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 1.20 GHz.
analyzing CPU 1:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 1
  CPUs which need to have their frequency coordinated by software: 1
  maximum transition latency: 4294.55 ms.
  hardware limits: 1.20 GHz - 3.50 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 1.20 GHz and 3.50 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 1.20 GHz.
......

$ cpufreq-info | grep "current CPU frequency"
  current CPU frequency is 1.38 GHz.
  current CPU frequency is 1.23 GHz.
  current CPU frequency is 1.20 GHz.
  current CPU frequency is 1.20 GHz.
  current CPU frequency is 1.20 GHz.
  current CPU frequency is 1.20 GHz.
  current CPU frequency is 1.20 GHz.
......

watch -n1 "lscpu | grep MHz | awk '{print $1}'";