Memcached 是一个高性能的分布式内存对象缓存系统，用于动态Web应用以减轻数据库负载。它通过在内存中缓存数据和对象来减少读取数据库的次数，从而提供动态数据库驱动网站的速度。Memcached 基于一个存储键/值对的 hashmap。Memcached-1.4.7的代码量还是可以接受的，只有10K行左右。下载地址：http://memcached.org/
If using Linux, you need a kernel with epoll. Sure, libevent will
work with normal select, but it sucks.
epoll isn’t in Linux 2.4, but there’s a backport at:
http://www.xmailserver.org/linux-patches/nio-improve.html
You want the epoll-lt patch (level-triggered).
If you’re using MacOS, you’ll want libevent 1.1 or higher to deal with
a kqueue bug.
Also, be warned that the -k (mlockall) option to memcached might be
dangerous when using a large cache. Just make sure the memcached machines
don’t swap. memcached does non-blocking network I/O, but not disk. (it
should never go to disk, or you’ve lost the whole point of it)
Want to contribute? Up-to-date pointers should be at: