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Principle of Super-server

A super-server or sometimes called a service dispatcher is a type of daemon run generally on Unix-like systems.


A super-server starts other servers when needed, normally with access to them checked by a TCP wrapper. It uses very few resources when in idle state. This can be ideal for workstations used for local web development, client/server development[] or low-traffic daemons with occasional usage (such as ident and SSH).


There is a slight delay in connecting to the sub-daemons. Thus, when compared to standalone servers, a super-server setup may perform worse, especially when under high load. Some servers, such as tftpd-hpa, therefore take over the internet socket and listen on it themselves for some specified interval, anticipating more connections to come.


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