php-fpm optimization - memory issues

[louking]

after implementation of php 7.3, started seeing high memory utilization on server

for suggestions on how to tune see

• https://guides.wp-bullet.com/adjusting-php-fpm-performance-low-memory/
• https://www.stephenrlang.com/2018/02/centos-7-apache-2-4-with-php-fpm/
• https://serversforhackers.com/c/php-fpm-process-management
• https://medium.com/@sbuckpesch/apache2-and-php-fpm-performance-optimization-step-by-step-guide-1bfecf161534 [this was behind pay wall]

[louking]

Mostly used values from https://guides.wp-bullet.com/adjusting-php-fpm-performance-low-memory/

2019-07-26 16:45 $ diff www.conf.initial www.conf
                  104c104
                  < pm = dynamic
                  ---
                  > pm = ondemand
                  115c115
                  < pm.max_children = 50
                  ---
                  > pm.max_children = 25
                  135c135
                  < ;pm.process_idle_timeout = 10s;
                  ---
                  > pm.process_idle_timeout = 10s;
                  141c141
                  < ;pm.max_requests = 500
                  ---
                  > pm.max_requests = 500