memcached
An interesting reading about Facebook internals - looks like they have 200 (!) machines with no hard drives that are dedicated memcached servers.
Another quote:
For Bloglines, we commonly have pages that will do 200 to 1000 object fetches from memcache. Getting to 6 million+ aggregate memcache requests per second is definitely feasible.
Reading about really big systems can be shocking sometimes =)
PS Facebook is built in PHP, C++, Perl, Python, Java, and even a little bit of ML—and it all works together
Another quote:
For Bloglines, we commonly have pages that will do 200 to 1000 object fetches from memcache. Getting to 6 million+ aggregate memcache requests per second is definitely feasible.
Reading about really big systems can be shocking sometimes =)
PS Facebook is built in PHP, C++, Perl, Python, Java, and even a little bit of ML—and it all works together