Question

High CPU and Memory PHP-FPM 7.2

Posted on December 30, 2018
Ubuntu 18.04 PHP
Asked by Stefanos T

Hello,

We are using a droplet with 4 GB Memory / 80 GB Disk / FRA1 - Ubuntu 18.10 x64. We have installed varnish, nginx 1.15.5, php 7.2. Mysql is hosted on another droplet. In droplet graphs php-fpm7.2 seems to use CPU 95% and Memory 46%. I have tried many configurations for php-fpm without fixing my problem.

Previously i had my droplet using php-fpm 7.0 and was working normally. Any suggestions please?

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negrusti • December 30, 2018

Accepted Answer

Hi, For starters create separate php-fpm pools for each domain, and you will see in htop which domain creates the load. Then you will need PHP profiling to find the bottleneck in the code of this site.

Regards Gregory

Stefanos T • December 30, 2018

On my /etc/php/7.2/fpm/pool.d/www.conf we are having the following:

pm = dynamic pm.max_children = 10 pm.start_servers = 4 pm.min_spare_servers = 2 pm.max_spare_servers = 6 pm.max_requests = 500

Using top -c you can see high CPU usage (i cannot find a way to check which domain is each pid refer to):

9484 www-data 20 0 656060 397488 114020 S 56.5 9.8 3:02.52 php-fpm: pool www
9621 www-data 20 0 634516 362396 100496 S 34.6 9.0 1:08.24 php-fpm: pool www
9514 www-data 20 0 554140 283408 101936 S 19.3 7.0 2:58.73 php-fpm: pool www
9487 www-data 20 0 543668 271680 100692 S 17.6 6.7 2:52.57 php-fpm: pool www
1084 redis 20 0 971644 262836 2584 S 10.0 6.5 75:30.51 /usr/bin/redis-server 127.0.0.1:6379
9517 www-data 20 0 666512 395724 101900 R 2.0 9.8 2:28.29 php-fpm: pool www