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< Erlang ~ conceptual questions |
| phicarre |
 Posted: Mon Mar 23, 2009 6:43 pm |
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Joined: 23 Mar 2009
Posts: 14
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Hi,
I discovered this language this week-end and tried to read the much of possible. Now I have an headache and a lot of conceptual questions.
I would like to know the best definition of these terms and their interactions:
node, server, application, process, modules, supervisor |
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| uwiger |
| Posted: Mon Mar 23, 2009 9:46 pm |
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User
Joined: 03 Jul 2006
Posts: 604
Location: Sweden
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phicarre wrote: I would like to know the best definition of these terms and their interactions:
node, server, application, process, modules, supervisor
node: One instance of the Erlang virtual machine, when Distributed Erlang is enabled (usually by starting the VM with erl -name N or erl -sname N)
server: usually just an Erlang process that implements a request/response pattern.
application: A component, consisting of Erlang modules, and possibly also non-Erlang code, grouped together using an OTP "application resource file" (.app file) An application can be loaded, started and upgraded as a unit.
process: Think processes in Unix, only much more lightweight. A process is an execution context, with its own protected memory.
module: The smallest loadable unit of code. Used to group functions into a flat namespace (Module:Function(...))
supervisor: An Erlang process whose main task it is to "monitor" a set of worker processes and restart them if they crash.
These concepts are very well described in Joe Armstrong's book. Highly recommended reading. |
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| phicarre |
| Posted: Mon Mar 23, 2009 10:32 pm |
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Joined: 23 Mar 2009
Posts: 14
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| Thank you. Still many reading ! |
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