测试代码如下：

# -*- coding: UTF-8 -*-from gevent.monkey import patch_all;patch_all()from multiprocessing import Process,cpu_countimport urllib2,gevent,random,sysimport cookielibdef start():    url = "这里填写你的网站"    user_agent = ["Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36",                  "Mozilla/5.0 (Windows; U; Windows NT 5.2) AppleWebKit/525.13 (KHTML, like Gecko) Version/3.1 Safari/525.13",                  "Mozilla/5.0 (iPhone; U; Mac OS X) AppleWebKit/420.1 (KHTML, like Gecko) Version/3.0 Mobile/4A93 Safari/419.3",                  "Mozilla/5.0 (Windows; U; Windows NT 5.2) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.2.149.27 Safari/525.13 ",                  "Mozilla/5.0 (Windows; U; Windows NT 5.1) Gecko/20070803 Firefox/1.5.0.12"                  ]    while 1:        try:            User_Agent = random.choice(user_agent)            cookie = cookielib.CookieJar()            opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookie))            request = urllib2.Request(url)            request.add_header('User-Agent',User_Agent)            opener.open(request)        except IOError:            #print "unknow error"            opener.close()        finally:            opener.close()            cookie.clear()def main():    gevent.joinall([gevent.spawn(start) for i in range(1000)])if __name__ == '__main__':    try:        for i in range(cpu_count()):#充分利用多核心            p = Process(target=main)            p.start()    except:        sys.exit(0)

模拟CPU数量的并发,保证充足的CPU利用率！