https://seniorphp.net/high-performance-apache-with-mpm-event-and-php-fpm/
Next, we edit config file for mpm-event
at /etc/apache2/mod-available/mpm-event.conf
:
# event MPM
# StartServers: initial number of server processes to start
# MinSpareThreads: minimum number of worker threads which are kept spare
# MaxSpareThreads: maximum number of worker threads which are kept spare
# ThreadsPerChild: constant number of worker threads in each server process
# MaxRequestWorkers: maximum number of worker threads
# MaxConnectionsPerChild: maximum number of requests a server process serves
<IfModule mpm_event_module>
ServerLimit 256
StartServers 25
MinSpareThreads 25
MaxSpareThreads 75
ThreadLimit 50
ThreadsPerChild 25
MaxRequestWorkers 6400
MaxConnectionsPerChild 0
</IfModule>