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Get CPU/RAM usage per process on Linux

  • Jul 22 / 2017
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Linux

Get CPU/RAM usage per process on Linux

When you’re facing performance issues, it’s always useful to check CPU/MEM usage per process to see if you have an issue with a specific process. For that, you can use ps and some sorting commands.

Tip: You can shrink the results to the first lines by using head

Memory analysis

We’re using the –sort -rss attributes to get the results sorted by RSS in the desc order (use –sort rss for the asc order)

$ps auxw --sort -rss | head -n5
USER       PID %CPU %MEM     VSZ     RSS TTY      STAT START   TIME COMMAND
mysql      604  0.2  8.4 1628428  177968 ?        Ssl  Jun30  71:59 /usr/sbin/mysqld
phpuser   9625  0.1  1.9  239588   40896 ?        S    Jul12  12:35 php-fpm: pool www
phpuser  14625  0.1  1.8  239572   39668 ?        S    Jul12  12:08 php-fpm: pool www
named     1849  0.0  1.2  299868   25984 ?        Ssl  Jun30   0:11 /usr/sbin/named -f -u bind
root       252  0.0  0.5  82868    12096 ?        Ss   Jun30   1:19 /usr/sbin/syslog-ng -F

CPU analysis

We’re using the –sort -%cpu attributes to get the results sorted by CPU in the desc order (use –sort %cpu for the asc order)

ps auxw --sort -%cpu | head -n5
USER       PID %CPU %MEM     VSZ    RSS TTY      STAT START   TIME COMMAND
named     1849  0.9  0.1  299868  25984 ?        Ssl  Jun30   0:21 /usr/sbin/named -f -u bind
root      1668  0.5  0.0  259000  10332 ?        Sl   Jun23 195:48 /sbin/rsyslogd -i /var/run/syslogd.pid -c 5
postfix   9889  0.4  0.0  102368   7736 ?        S    05:44   0:00 smtpd -n smtp -t inet -u -o stress=
mysql      604  0.2  8.4 1628428 177968 ?        Ssl  Jun30  72:09 /usr/sbin/mysqld
phpuser   7960  0.1  1.8  238572  38780 ?        S    Jul17   4:35 php-fpm: pool www

Then…

Once you got the results, it’s time for you to investigate further and analyze what’s happening with those processes! Good luck!

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