linux命令 top详解
引言：今天的命令是用来看cpu信息的top
我们先看man top
top - display Linux processes
翻译：显示linux进程信息
具体的描述如下：
The top program provides a dynamic real-time view of a running sys‐
tem. It can display system summary information as well as a list of
processes or threads currently being managed by the Linux kernel.
The types of system summary information shown and the types, order
and size of information displayed for processes are all user config‐
urable and that configuration can be made persistent across restarts.
The program provides a limited interactive interface for process
manipulation as well as a much more extensive interface for personal
configuration -- encompassing every aspect of its operation. And
while top is referred to throughout this document, you are free to
name the program anything you wish. That new name, possibly an
alias, will then be reflected on top's display and used when reading
and writing a configuration file.
翻译如下：
top命令提供一个运行中系统的动态实时视图，它可以显示系统摘要信息以及由linux内核管理的的进程或线程的列表。系统概要信息的类型被显示出来，类型、顺序为进程显示的信息大小都是用户配置的。可以通过重新启动使配置持久化。
该程序为进程操作提供有限的交互式界面。并为个人配置提供了更广泛的接口 - 涵盖了其操作的各个方面。 虽然本文档中提到了toplinux命令大全，但你可以随意命名该程序。 该新名称（可能是别名）将反映在top的显示界面上，并在读取和写入配置文件时使用。
我们再来看一下命令执行结果
top - 17:00:43 up 12 days, 1:13, 3 users, load average: 6.27, 3.04, 2.31
Tasks: 444 total, 3 running, 441 sleeping, 0 stopped, 0 zombie
%Cpu(s): 19.0 us, 4.7 sy, 0.0 ni, 75.1 id, 1.1 wa, 0.0 hi, 0.2 si, 0.0
KiB Mem : 16131568 total, 926512 free, 8862288 used, 6342768 buff/cache
KiB Swap: 8191996 total, 8191900 free, 96 used. 5994096 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5297 nobody 20 0 283588 20388 5372 R 9.3 0.1 9:25.75 php-fpm
23312 nobody 20 0 372584 21660 6272 S 9.3 0.1 14:31.92 php-fpm
23325 nobody 20 0 353288 13676 4916 R 9.3 0.1 14:55.50 php-fpm
......
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