两个包：
libevent-1.3d.tar.gz和memcached-1.2.2.tar.gz在/home/datou目录下呢
1.先安装libevent-1.3d.tar.gz
tar -zxvf libevent-1.3d.tar.gz
cd libevent-1.3d
./configure
make
make install
2.安装memcache-1.2.2.tar.gz
tar -zxvf memcache-1.2.2.tar.gz
cd memcache-1.2.2
./configure
make
make install
3.cp一个文件到/usr/lib下
cd /home/datou/libevent-1.3d/.libs
cp libevent-1.3d.so.1  /usr/lib
4.useradd -s /sbin/nologin memcached
5. 启动memcache
memcached -u memcached -d -m 1024 -c 10240 -p 11211 -t 2