安装libevent及Memcahced
cd /usr/local/src
http://www.monkey.org/~provos/libevent/libevent-1.4.9-stable.tar.gz
tar xzvf libevent-1.4.9-stable.tar.gz
./configure --prefix=/usr/local/libvent
make
make install
http://www.danga.com/memcached/dist/memcached-1.2.6.tar.gz
tar xzvf memcached-1.2.6
/usr/local/bin/memcached -d -u apache -m 256 -c 8192
./configure --prefix=/usr/local/memcached
make
make install