Swap is used even though >50% of RAM is still free | MacRumors Forums
Nginx + PHP 5.3.3 (with php-fpm) - memory usage? - Server Fault
How to Clear RAM Cache, Buffer, and Swap Space on Linux System – LinuxWays
5 commands to check memory usage on Linux - BinaryTides
PHP opcache. 100% hits, 100% used memory - Server Fault
Linux Performance: Why You Should Almost Always Add Swap Space
Optimizing cloud server (php and mysql) - Database Administrators Stack Exchange
PHP-FPM tuning: Using 'pm static' for max performance
Configuring Apache/PHP/MySQL for Low Memory (RAM) VPS
7 Commands to Check Memory Usage and Swap Space in Debian 10 – VITUX
How To Add Swap on CentOS 7 | DigitalOcean
Configuring Apache/PHP/MySQL for Low Memory (RAM) VPS
How to stop FreeNAS from using swap | TrueNAS Community
Increase memory (RAM) in Ubuntu - linux by using swap file
Nginx and php-fpm: cannot get rid of 502 and 504 errors - Stack Overflow
Virtual memory - Wikipedia
How to Clear RAM Memory Cache, Buffer and Swap Space on Linux - GeeksforGeeks
3 Quick Optimisations for your PHP site
Optimizing cloud server (php and mysql) - Database Administrators Stack Exchange
Linux Find Out What Process Are Using Swap Space - nixCraft
How to investigate a memory leak with Apache and PHP? - Server Fault
How to investigate a memory leak with Apache and PHP? - Server Fault
Free Up Inactive Memory in Mac OS X with Purge Command | OSXDaily
Linux Performance: Why You Should Almost Always Add Swap Space
Composer update memory limit - Stack Overflow
