Atop Command Tutorial With Examples To Monitor Linux System Meterics

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Atop is a monitoring tool which is mainly developed for command line usage. It is capable of showing detailed information about process, memory, disk network information and metrics. Atop commands provides more details than popular top command.

Syntax

Help

Start

Atop can be started just issuing atop command. But to get more detailed information and metrics about different subsystem usages providing root privileges are better way.

Atop

Atop

As we can see from screenshot the information provided is more than we may want the terminal screen fills up with monitoring information. We will look how to show specific information about CPU,process,network,disk memory etc.

Display CPU Usage

We can display CPU related information with c shortcut after atop started. This will list processes according to their CPU usage with their PID’s and full command line with parameters and options.

Display CPU Usage

Display CPU Usage

Display Memory Usage

We can show memory usage with m shortcut. This will list information like PIC, minimum and maximum fault numbers, vstext, vsize,rsize,vgrow, rgrow, running user ID, effective user ID , memory usage and command.

Display Memory Usage

Display Memory Usage

Display Disk Utilization

Another usage type of disk utilization. We will use –d option for this.

Display Disk Utilization

Display Disk Utilization

We can see that disk utilization of the each process is show separately. Each process disk metrics like

  • RRDSK shows read disk
  • WRDSK shows write disk
  • WCANCL
  • DSK shows general disk usage
  • CMD shows related command
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Display Process Information In Cumulative Manner

Process information can be listed with –p option. This will also show other metrics about disk, network and memory

Display Process Information

Display Process Information

  • SYSCPU show system side CPU usage
  • USRCPU shows user side CPU usage
  • VSIZE shows virtual memory size
  • RSIZE shows real memory size
  • RDDSK shows disk read
  • WRDSK shows disk write
  • RNET shows network receive
  • SNET shows network send
  • CPU shows shortcutCPU usage percentage
  • CMD shows related command

Display Process Information In Cumulative Manner According To User

Another useful feature of the atop is showing metrics in user perspective. This shortcut will sum up all metrics according to user. We will use –u option.

Display Process Information In Cumulative Manner According To User

Display Process Information In Cumulative Manner According To User

Display Network Usageshortcut

Network usage can be displayed with  –n option. But there is dependency for netatop to probe the network information.

Show Generic Information

General information about system an process can be listed with -g option like below.

Show Generic Information

Show Generic Information

Show All Process

up to now only active process are shown. We can list all process without filtering them with -a option.

Show All Process

Show All Process

Display Details / Verbose Mode

More details about current windows can be show with verbose mode. Verbose mode can be call -v option or v shortcut after atop starts.

Display Details / Verbose Mode

Display Details / Verbose Mode

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