Hack The Sec-Leading Resource Of Linux Tutorial: Atop

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Atop – monitor system resources in Linux 
Atop is an ASCII full-screen performance monitor for Linux that is capable of reporting the activity of all processes (even if processes have finished during the interval), daily logging of system and process activity for long-term analysis, highlighting overloaded system resources by using colors, etc. At regular intervals, it shows system-level activity related to the CPU, memory, swap, disks (including LVM) and network layers, and for every process (and thread) it shows e.g. the CPU utilization, memory growth, disk utilization, priority, username, state, and exit code. 
In combination with the optional kernel module netatop, it even shows network activity per process/thread. 
 
The command atop has some major advantages compared to other performance monitoring tools: 
 
<ul style="text-align: left;">
<li>Resource consumption by all processes</li>
<li>Utilization of all relevant resources</li>
<li>Permanent logging of resource utilization</li>
<li>Highlight critical resources</li>
<li>Scalable window width</li>
<li>Resource consumption by individual threads</li>
<li>Watch activity only</li>
<li>Watch deviations only</li>
<li>Accumulated process activity per user</li>
<li>Accumulated process activity per program</li>
<li>Network activity per process</li>
</ul>
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Install atop on RHEL/CentOS and Fedora linux</div>
 
 
First you need to enable <a href="http://www.hackthesec.co.in/search/label/EPEL">EPEL </a>or RPMForge repository as described here to install atop. Type the following yum command: 
<span style="-webkit-text-stroke-width: 0px; background-color: white; color: #0b5394; font-family: verdana, geneva, sans-serif; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 19.2px; orphans: auto; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px;"> 
<pre style="-webkit-text-stroke-width: 0px; background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; orphans: auto; overflow: auto; padding: 10px !important; text-align: left; text-indent: 0px; text-transform: none; widows: 1; width: auto !important; word-break: break-all; word-spacing: 0px;"># yum -y install atop</pre>
Install Atop on Debian/Ubuntu and Mint linux 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># sudo apt-get install atop -y</pre>
How to use atop program 
 
Type the following command as root user: 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># atop</pre>
Example output: 
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhY3KUrjYz1ECI8YNqifrVz9jOMiMzIPv0z2Ld1Tw8LhWVlnTUC9aBCw4FbG7Uw-EAzep6XFQwsVA3cS_Nbksw_LOvwqYAiLu_HLpqwgrW40xlAKYiQxHT_TzPXmFbi_VkrkrihBfBSbfAd/s1600/atop_hackthesec.co.in.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhY3KUrjYz1ECI8YNqifrVz9jOMiMzIPv0z2Ld1Tw8LhWVlnTUC9aBCw4FbG7Uw-EAzep6XFQwsVA3cS_Nbksw_LOvwqYAiLu_HLpqwgrW40xlAKYiQxHT_TzPXmFbi_VkrkrihBfBSbfAd/s1600/atop_hackthesec.co.in.png" /></a></div>
 
To see active processes only 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># atop -a</pre>
Display individual threads 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># atop -y</pre>
Display average-per-second i.s.o. total values 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># atop -1</pre>
Display memory-related process-info 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># atop -m</pre>
Display disk-related process-info 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># atop -d</pre>
Display network-related process-info 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># atop -n</pre>
Display scheduling-related process-info 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># atop -s</pre>
Display various process-info (ppid, user/group, date/time) 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># atop -v</pre>
Display command line per process 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># atop -c</pre>
Sorting option 
Pass the following option to sort your process: 
 
-C sort processes in order of cpu-consumption (default) 
-M sort processes in order of memory-consumption 
-D sort processes in order of disk-activity 
-N sort processes in order of network-activity 
-A sort processes in order of most active resource (auto mode) 
 
 
For more information about Atop see man page: 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; line-height: 19.2px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;"># man atop</pre>
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Atop – monitor system resources in Linux

Atop – monitor system resources in Linux Atop is an ASCII full-screen performance monitor for Linux that is capable of reporting the activ...