I have a php-fpm server running on a high-traffic website (behind nginx). It is frequently reaching a point where the active processes are equal to the maximum number of processes, which is the most that the server's memory will allow.
When this happens it can take 5 - 10 seconds to load the php-fpm status page. It appears that the request is being queued. However the listen queue value always shows 0.
Why wouldn't this report the correct value?