top 命令
目录
top – display sorted information about processes
top 命令是动态查看进程变化，监控linux的系统状况；它是常用的性能分析工具，能够实时显示系统资源各个进程占用状况
-h | -v: 显示帮助或者版本信息】 -c: 命令行列显示程序名以及参数 -d: 启动时设置刷新时间间隔 -H： 设置线程模式 -i: 只显示活跃进程 -n: 显示指定数量的进程 -p: 显示指定PID的进程 -u: 显示指定用户的进程
先利用top命令进入视图，再f键看下全称信息，再q退出回到top视图。
Fields Management for window 1:Def, whose current sort field is %CPU
Navigate with Up/Dn, Right selects for move then <Enter> or Left commits,
'd' or <Space> toggles display, 's' sets sort. Use 'q' or <Esc> to end!
* PID = Process Id TGID = Thread Group Id
* USER = Effective User Name ENVIRON = Environment vars
* PR = Priority vMj = Major Faults delta
* NI = Nice Value vMn = Minor Faults delta
* VIRT = Virtual Image (KiB) USED = Res+Swap Size (KiB)
* RES = Resident Size (KiB) nsIPC = IPC namespace Inode
* SHR = Shared Memory (KiB) nsMNT = MNT namespace Inode
* S = Process Status nsNET = NET namespace Inode
* %CPU = CPU Usage nsPID = PID namespace Inode
* %MEM = Memory Usage (RES) nsUSER = USER namespace Inode
* TIME+ = CPU Time, hundredths nsUTS = UTS namespace Inode
* COMMAND = Command Name/Line
PPID = Parent Process pid
UID = Effective User Id
RUID = Real User Id
RUSER = Real User Name
SUID = Saved User Id
SUSER = Saved User Name
GID = Group Id
GROUP = Group Name
PGRP = Process Group Id
TTY = Controlling Tty
TPGID = Tty Process Grp Id
SID = Session Id
nTH = Number of Threads
P = Last Used Cpu (SMP)
TIME = CPU Time
SWAP = Swapped Size (KiB)
CODE = Code Size (KiB)
DATA = Data+Stack (KiB)
nMaj = Major Page Faults
nMin = Minor Page Faults
nDRT = Dirty Pages Count
WCHAN = Sleeping in Function
Flags = Task Flags <sched.h>
CGROUPS = Control Groups
SUPGIDS = Supp Groups IDs
SUPGRPS = Supp Groups Names
常用场景
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