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# Get CPU/RAM usage per process on Linux
- URL: https://www.bagz.fr/get-cpuram-usage-per-process-on-linux/
- Published: 2017-07-22T16:29:14.000Z
- Updated: 2017-07-22T16:29:14.000Z
- Author: bgazui
- Tags: Linux, #Migrated-1790668826633, #wp, #wp-post, #Import 2026-09-29 08:00

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!