Linux Process, linux deletion Process

Linux Process, linux deletion Process

1. Process Overview

◆ A process is a program or command being executed. Every process is a running entity with its own address space and occupies certain system resources.

2. Role of process management

◆ Determine the health status of the server

◆ View all processes in the system

◆ Killing Processes

3. Process Management-view Processes

View All PROCESSES IN THE SYSTEM

[Root @ localhost ~] # Ps aux

# View all processes in the system, using the BSD operating system format (Unix format)

[Root @ localhost ~] # Ps-le

# View all processes in the system and use the standard Linux Command Format.

 

 

◆ USER: the USER who generates the process;

◆ PID: ID of the process;

◆ % CPU: the percentage of CPU resources occupied by the process. The higher the CPU usage, the more resources the process consumes;

◆ % MEM: Percentage of physical memory occupied by the process. The higher the memory occupied, the more resources the process consumes;

◆ VSZ: the virtual memory occupied by the process, in KB;

◆ RSS: the actual physical memory occupied by the process, in KB;

◆ TTY: the process runs on that terminal. The tty1-tty7 represents the local console terminal, the tty1-tty6 is the local character interface terminal, and the tty7 is the graphical terminal. Pts/0-255 represents a virtual terminal.

◆ SATA: Process status. Common statuses include: R: Run, S: Sleep, T: Stop, s: contains sub-processes, and +: Located in the background

◆ START: START Time of the process

◆ TIME: the CPU computing TIME occupied by the process. Note that it is not the system TIME.

◆ COMMAND: name of the COMMAND that generates this process

 

4. view the System Health Status

[Root @ localhost ~] # Top [Options]

Option:

-D seconds: specifies the number of seconds that the top command updates. By default, commands that can be executed in the top command interaction mode in 3 seconds are as follows:

? Or h: Help of the real interaction mode

P: sort by CPU usage. This option is used by default.

M: sort by memory usage

N: sort by a PID

-Q: Exit top.

 

The most important task of the top command is the first five lines!