Concurrent connections Apache

Concurrent_apache.sh

#!/bin/bash

# RAM consumed in MB per connection
ps -ylC apache2 --sort:rss | awk '{SUM += $8; I += 1} END {print SUM/I/1024}'

# System consumed in MB.
ps -N -ylC apache2 --sort:rss | awk '{SUM += $8} END {print SUM/1024}'

(RAMTOTAL – RAM_RESTOPROCESOS) / RAM_POR_CONEXIÓN

Example:
(4096 – 800)/10= 329 conexiones simultáneas

<IfModule mpm_prefork_module>
  StartServers 5
  MinSpareServers 5
  MaxSpareServers 10
  MaxClients 150
  MaxRequestsPerChild 0
</IfModule>

# New setup --> ServerLimit 270
<IfModule mpm_prefork_module>
  StartServers 5
  MinSpareServers 5
  MaxSpareServers 10
  ServerLimit 270
  MaxClients 250
  MaxRequestsPerChild 0
</IfModule>