Multi-process webserver vs multi threaded web server? [closed]

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开发者_C百科 Improve this question

I would like to know why we prefer to make web servers multi-threaded

instead of make it multi-process web servers ....

Is it because of legacy issues.....

I would like to hear practical reasons as well as theoretical reasons

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On *nix, to start up a process you need duplicate all the resources of the parent process. All the parents file descriptors are dup'ed, for example, and a new memory space is created to contain the new process. When the process terminates everything has to be torn down.

A thread, on the other hand, is essentially just a stack. Very quick to start and stop.

Early web servers didn't use threads for a simple reason: they weren't implemented yet.

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Threads are usually cheaper than processes.