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Which tools and technologies build the Stack Exchange Network?

How is stackoverflow able to offer such a smooth user experience for such a large userbase? I would love to know what its technology stack is including OS/Webserver/Database/Programming Language and optimization strategies (e.g. memcache).

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migrated from stackoverflow.com Apr 2 '11 at 9:28

This question came from our site for professional and enthusiast programmers.

marked as duplicate by Greg Hewgill, YOU, fretje, Yi Jiang, Zypher Apr 2 '11 at 11:04

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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This is a question for Serverfault. – Prydie Apr 2 '11 at 9:23
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No, it's a question for meta, but it's already been asked there a zillion times: meta.stackexchange.com/questions/10369/… – Greg Hewgill Apr 2 '11 at 9:27

An old blog post has some details.

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