http://pythonhosted.org/pyev/index.html
libev is an event loop: you register interest in certain events (such as a file descriptor being readable or a timeout occurring), and it will manage these event sources and provide your program with events.
pyev — Python libev interface.
所以安装pyev 前先要安装libev, 注意libev的版本
STEP 1]
下载 libev（官网没能进的去。。。），http://download.csdn.net/detail/lincoln_2012/9718078 ,从下一个
STEP 2]
下载 pyev，https://pypi.python.org/pypi/pyev/
STEP 3]
安装libev
3-1 解压 tar zxvf libev-4.15.tar.gz
3-2 cd libev-4.15; ./configure; make; make install (root 权限)
STEP 4]
安装 pyev
4-1 tar zxvf pyev-0.9.0.tar.gz
4-2 cd pyev-0.9.0; python setup.py install
报错：
OSError: libev.so.4: cannot open shared object file: No such file or directory
解决：
vi /etc/ld.so.conf， 添加/usr/local/lib， 再输入ldconfig
示例：
include ld.so.conf.d/*.conf /usr/local/lib
再次到pyev解压目录：python setup.py install
Done！
