The server has reached the MaxClients configuration, consider configuring MaxClients. APC

Question

I have a Drupal installation working inside the server with this configuration:

StartServers 5 MinSpareServers 5 MaxSpareServers 15 MaxClients 50 MaxRequestsPerChild 1000 

I installed APC and MemCached. APC works as shown in this image:

But I get this error in Apache logs:

 [Fri Feb 15 14:04:48 2013] [error] server reached MaxClients setting, consider raising the MaxClients setting 

Concurrent users at the time of the error were less than 50 and ps -aux | grep apache indicates that the entire apache process is in state S.

What can happen? Does APC run out of memory? I spent the last 3 hours finding a problem, but any solution works for me.

thanks

Answer 1

Well, Apache HTTPd reports that at a certain time, which could have lasted less than a second, there were more concurrent MaxClients connections. I don’t know how you count concurrent "users", but one browser can open much more than one connection to the same server (for example, to extract images or CSS in parrallel).