php-fpm default process manager
I did some test and research with nginx + php-fpm using process manager in ondemand mode. Is just a dream!
There aren't children at startup (0). Using dynamic mode and a few customers you are lost, tons of process will eat your memory.
ondemand is amazing, children are forked with new connections and after timeout, return to 0!! Default idle_timeout is set in 10 seconds!!!
Please consider ondemand for ispconfig.