Cannot allocate memory: fork: Unable to fork new process?

Question

We have our hosting in aws. Recently after moving our blog from wordpress to aws, we are experiencing noticeable delay in server response

Answer 1

Changed Apache's prefork MPM into the httpd.conf These are the values I ended up using:

StartServers 1

MinSpareServers 1

MaxSpareServers 5

ServerLimit 16

MaxClients 16

MaxRequestsPerChild 0

ListenBacklog 100

Then, try to desactivate some modules php with sudo a2dismod name_of_module