I recently asked this question and I got an answer about how I should limit php-fpm from running 34 worker process, considering that I get on average 20 visits for one light website.
So, I configured PHP-FPM as shown in the answer, the problem is that, as soon as I finished configuring php-fpm, I saw a huge chunk of memory freed from my VPS server, and assumed the problem was fixed. But when I checked today, I found out that I was running out of memory again, and that PHP-FPM is still running 34 worker process, despite the configuration. It seems the configuration is not reliable, or something is wrong with PHP-FPM. Does this happen to everyone? or am I doing the configuration wrong?