Linux CentOS 8 查看系统进程信息

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top

man

#man top information
$man top 
NAME
       top - display Linux processes

SYNOPSIS
       top -hv|-bcEHiOSs1 -d secs -n max -u|U user -p pid -o fld -w [cols]

       The traditional switches `-' and whitespace are optional.

DESCRIPTION
       The top program provides a dynamic real-time view of a running system.  It can display system summary information as well as a list of pro‐
       cesses 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 configurable 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 con‐
       figuration  --  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.           

top -h

[arthur@localhost ~]$ top -help
  procps-ng 3.3.15
Usage:
  top -hv | -bcEHiOSs1 -d secs -n max -u|U user -p pid(s) -o field -w [cols]           

查看系统进程动态信息

#example: 
$top
top - 11:55:48 up 14:34,  1 user,  load average: 0.54, 0.30, 0.13
Tasks: 276 total,   2 running, 274 sleeping,   0 stopped,   0 zombie
%Cpu(s):  3.1 us,  1.5 sy,  0.0 ni, 94.8 id,  0.0 wa,  0.4 hi,  0.2 si,  0.0 st
MiB Mem :   9356.3 total,   4824.7 free,   1896.4 used,   2635.2 buff/cache
MiB Swap:   4848.0 total,   4848.0 free,      0.0 used.   6934.0 avail Mem 

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                                                        
   2887 arthur    20   0 4487204 204476 109484 S   6.0   2.1   0:59.54 gnome-shell                                                                    
   1021 root     -51   0       0      0      0 D   3.3   0.0   0:10.28 irq/37-rmi4_smb                                                                
   3670 arthur    20   0  767400  50208  36212 S   2.7   0.5   0:09.45 gnome-terminal-                                                                
  32549 arthur    20   0   16.8g 108524  74992 S   2.7   1.1   0:07.81 chrome                                                                         
  32719 arthur    20   0   20.8g 216424 130188 S   2.7   2.3   0:17.09 chrome                                                  

注释：

PID (Process ID) : 进程标识号 ； USER： 进程使用者； PR（Priority）：优先级别，数值越小优先级越高； NI （Nice）： Nice value of task. 优先级别数值（数值越小越先执行）； VIRT ： 进程占用的虚拟内存值； RES ： 进程占用的物理内存值； SHR ： 进程使用的共享内存值； S ： 进程状态（S ： sleep; D: 不可中断睡眠状态； R ： 正在运行 ）; %CPU : 进程占用的CPU 使用率； %MEM ： 进程占用物理内存的百分比 ； TIME+ : 进程启用后占用的CPU 时间

其他：

top

显示当前最近运行的所有进程。

top -i

可以将空闲进程隐藏。