This video goes over optimizing apache memory usage by configuring mpm prefork module to optimal values for your server.

UPDATE: Run this curl command and it will just tell you what you should put curl -sL https://raw.githubusercontent.com/richardforth/apache2buddy/master/apache2buddy.pl | perl

Commands used: Check Apache Memory usage ps -ylC apache2 --sort:rss | awk '{sum+=$8; ++n} END {print "Tot="sum"("n")";print "Avg="sum"/"n"="sum/n/1024"MB"}' Launch Memory manager / resource viewer 'htop' OR you can use 'top' for less options and visuals

Values to calculate: Total System Memory Free - Buffer / Apache2 MB usage = MaxRequestWorkers, ServerLimit, and MaxClients

My Settings in Video: Server Instance (Standard) 1 dedicated vCPU with 3.5 GB of Memory

prefork MPM

StartServers: number of server processes to start

MinSpareServers: minimum number of server processes which are kept spare

MaxSpareServers: maximum number of server processes which are kept spare

MaxRequestWorkers: maximum number of server processes allowed to start

MaxConnectionsPerChild: maximum number of requests a server process serves

    StartServers            3
    MinSpareServers         5
    MaxSpareServers         10
    ServerLimit             45
    MaxClients              45
    MaxRequestWorkers       45
    MaxConnectionsPerChild  2000

45 processes x 68 MB per = 3060 MB

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