CPU 负荷过重时邮件报警

Posted 2021-03-25 develon

首先介绍一下 top 命令的使用方法, top 程序提供了运行系统的动态实时视图, 它可以显示系统摘要信息以及当前线程或进程的列表

$ top -h
  procps-ng 3.3.12
Usage:
  top -hv | -bcHioss -d secs -n max -u|U user -p pid(s) -o field -w [cols]

Global-defaults
              A - Alt display      Off (full-screen)
            * d - Delay time       1.5 seconds
            * H - Threads mode     Off (summarize as tasks)
              I - Irix mode        On  (no, `solaris' smp)
            * p - PID monitoring   Off (show all processes)
            * s - Secure mode      Off (unsecured)
              B - Bold enable      On  (yes, bold globally)
           Summary-Area-defaults
              l - Load Avg/Uptime  On  (thus program name)
              t - Task/Cpu states  On  (1+1 lines, see `1')
              m - Mem/Swap usage   On  (2 lines worth)
              1 - Single Cpu       Off (thus multiple cpus)
           Task-Area-defaults
              b - Bold hilite      Off (use `reverse')
            * c - Command line     Off (name, not cmdline)
            * i - Idle tasks       On  (show all tasks)
              J - Num align right  On  (not left justify)
              j - Str align right  Off (not right justify)
              R - Reverse sort     On  (pids high-to-low)
            * S - Cumulative time  Off (no, dead children)
            * u - User filter      Off (show euid only)
            * U - User filter      Off (show any uid)
              V - Forest view      On  (show as branches)
              x - Column hilite    Off (no, sort field)
              y - Row hilite       On  (yes, running tasks)
              z - color/mono       On  (show colors)

-hv 两者都是打印版本等帮助信息

-b 非窗口模式的输出
-c 显示进程的 command
-H 线程模式

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