Important commands related to the process management of learning notes

Ps,top,htop,dstat of process management commands

Ps:report a snapshot of the current processes.

Displays the status of the current process

Syntax: ps [options]

There are three styles of options:

1 、 UNIX options, which may be grouped and must be

Preceded by a dash.

2 、 BSD options, which may be grouped and must not

Be used with a dash.

3 、 GNU long options, which are preceded by two

Dashes.

Ps option option:

A: all terminal-related processes

X; all processes independent of the terminal

U: user-centered organization process status information display

Note: the above options do not have "-", and the results are not the same if you add "-".

One of the common combinations: aux

The meaning of the field in ps aux:

USER: user

PID; process number

% CPU: cumulative cpu occupancy

% MEM:% of total memory

VSZ: virtual memory set

RRS:resident size resident memory set (never put on swap partition)

STAT: process statu

R:running running state

S:interruptable sleeping interrupts sleep

D: uninterrupted sleep

T:Stoped stop state

Z: stiff state

+: foreground process (running on the terminal)

L: multithreaded process

N: low priority proc