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[piyush86]

Most of you guys must have played at least one of the so called 'social-games' on facebook. Most of these games are asynchronous multiplayers, i.e. no real-time interaction between players. I was wondering what scalable server technologies are used to serve such high number of players. I poked around the Farmville website and found out that they were using AMFPHP servers. I am not sure if that is the only thing they were using. Does anyone have any idea how its done...?

[John Nesky]

If your traffic is even a fraction of Farmville's, you're gonna need something like memcached:
http://memcached.org/

EDIT: I should clarify that Farmville is one of the most popular asynchronous games ever, if not the single most popular. It's damn hard to get that much traffic. I should also say that I can't say as much as I know about the topic because of nondisclosure agreements, but basically you should be writing your own server, but using tools like memcached or amazon s3 as appropriate.