Linux - How to monitor memory usage

Linux - How to monitor memory usage

 
Question : How to monitor memory [%MEM] in Linux?
Answer : ps command can be used to report a snapshot of the current processes in Linux. Use option aux and sort based on the column to get the top usage based on the parameter you need. If you need to get %MEM then you will need to sort column 4.
Example :
[root@server ~]# watch -n 2 'echo `ps aux |head -1`;ps aux |sort -nrk 4| head -10'
Note : Above command will output top 10 processes with highest %MEM in an interval of 2 seconds.


Question : How to monitor memory [%MEM] in Linux?
Answer : Besides using method above, top command can be used to monitor %MEM in Linux. Issue command top. It will display a list of processes sorted based on CPU usage. Then issue "M" to sort based on %MEM. Alternative issue top with option "m".
Example :
[root@server ~]# top -m


Question : How to monitor free and used memory in Linux?
Answer : free command can be used to monitor free and used memory in Linux. To include a line containing total memory and swap option "t" can be used. Option "m" can be used display value in megabytes [MB]. Option "s" along with a interger value can be used to specific interval of monitoring needed.
Example :
[root@server ~]# free -mt -s 3
total used free shared buffers cached
Mem: 7979 7665 313 0 191 5777
-/+ buffers/cache: 1696 6282
Swap: 32767 0 32767
Total: 40747 7665 33081


Question : How to monitor memory [%MEM] of a specific process in Linux?
Answer : top command with option "p" followed by PID can be used to specific which process to monitor.
Example :
[root@server ~]# top -p <PID>
0 (0)
Article Rating (No Votes)
Rate this article
Attachments
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Full Name
Email Address
Security Code Security Code
Related Articles RSS Feed
Logowanie za pomocą kluczy Secure Shell
Viewed 3159 times since Thu, May 24, 2018
RHEL: ACLs basics
Viewed 6506 times since Sun, May 27, 2018
Check a Website Availability from the Linux Command Line
Viewed 6900 times since Mon, Feb 18, 2019
Szybkie sprawdzenie zewnętrznego adresu IP i hosta
Viewed 3584 times since Thu, May 24, 2018
Using stunnel and TinyProxy to obfuscate HTTP traffic
Viewed 7238 times since Fri, Sep 28, 2018
HOWTO: Use SSL/port 465 in smarthost stunnel
Viewed 4074 times since Fri, Sep 28, 2018
How to Configure ‘FirewallD’ in RHEL/CentOS 7 and Fedora 21
Viewed 10783 times since Wed, Oct 9, 2019
Split and Reassemble files
Viewed 3705 times since Mon, May 28, 2018
12 Linux Rsync Options in Linux Explained
Viewed 12277 times since Wed, Oct 31, 2018
ZPOOL: Add a mirror to a concat zpool
Viewed 4030 times since Sun, Jun 3, 2018