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PHP 8.2 FPM Tuning

This is a personal note for myself to remember the process I used to tune the php-8.2-fpm service on this computer running this website.

This site is running on a re-purposed laptop to work as a home server since running this website on a shared hosting has become erratic due to increasing traffic on the website – 6yrs and 297 days running now since I started the website (as of this writing). The shared hosting account that previously runs this website is running out of memory resources due to occasional spike in traffic. I also cannot run this website together with its database on a single computer since it is overloading the laptop a Core 2 Dou computer with 3GB of RAM.

So to make this website run on this computer since hosting it on a VPS server is a little bit expensive for me at the moment. I decided to use my home fiber bandwidth which is I think would be enough to run this website for the occasional spike in traffic. I configured this website on top of Apache2 / PHP-FPM / opcache and Redis server and separate the MySQL database to run on another netbook Atom processor with 2GB ram running on SSD.

The issues that I need to resolve is to prevent the PHP-FPM process to take all the memory resources upon computer start up. So I need to calculate properly the PHP consumption being used by PHP-FPM.

To check I execute this command:

$ ps -C php-fpm8.2 -o rss=

Ignoring the first line on the output I noticed that PHP is using around 75Mb of memory. So to configure I will allocate 2GB of RAM for PHP and configure the php-fpm service to run with dynamic allocation.

So 2000MB / 75MB = 30.769

Therefore I will set the pm.max_children to 30, and will set additional parameters accordingly.

pm.max_children = max_children

pm.start_servers = 25% of max_children

pm.min_spare_servers = 25% of max_children

pm.max_spare_servers = 75% of max_children

Applying the resulting calculations this is now my php-fpm configuration

pm = dynamic
pm.max_children = 30
pm.start_servers = 8
pm.min_spare_servers= 8
pm.max_spare+servers= 23
pm.max_requeste=0

Save the configuration in my php-fpm configuration file, restart the server and voila. No startup freeze and php-fpm process hugging up the memory resources.

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2m Vertical Dipole Array

Build a high gain 2meter vertical dipole array with this antenna plan. Ideal for repeater or base station setup.
Easy to follow build instruction by KG4JJH, with complete dimensions and diagram illustrations. Complete with antenna gain and pattern simulations and expected SWR response on the designed frequency.

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UV5R Charger Schematic

This is the most common UV5R Charger schematic available