新手一枚，用 python gevent 抓取网页碰到了一些问题，求解答

[nullllun]

代码放在网盘里了，其中fetcher.py是主要模块：
http://pan.baidu.com/s/1pJMFpxD

fetcher.py中distribute函数用于派发任务，也就是往协程池里添加协程，代码如下：

for url in task.urls:
proxy = self.getProxy()
print '[pid %d time %f] conPool size: %d distributing url: %s' %(os.getpid(), time.time(), len(self.pool), url)
self.pool.apply_async(self.fetch, args=(url, 'static', proxy))

理论上for循环能很快派发完任务，但是结果却不是这样的，1秒钟内只派发了几个任务：
[pid 5896 time 1429543816.844000] conPool size: 14 distributing url: http://hao123.com/
[pid 5896 time 1429543816.940000] conPool size: 15 distributing url: http://zol.com.cn/
[pid 5896 time 1429543817.035000] conPool size: 16 distributing url: http://tudou.com/
[pid 5896 time 1429543817.144000] conPool size: 17 distributing url: http://cntv.cn/
[pid 5896 time 1429543817.239000] conPool size: 18 distributing url: http://china.com.cn/
[pid 5896 time 1429543817.298000] conPool size: 19 distributing url: http://southcn.com/
[pid 5896 time 1429543817.304000] conPool size: 20 distributing url: http://taobao.com/
[pid 5896 time 1429543817.308000] conPool size: 21 distributing url: http://douban.com/
[pid 5896 time 1429543817.311000] conPool size: 22 distributing url: http://58.com/
[pid 5896 time 1429543817.315000] conPool size: 23 distributing url: http://tianya.cn/
[pid 5896 time 1429543817.361000] conPool size: 24 distributing url: http://ganji.com/
[pid 5896 time 1429543817.487000] conPool size: 25 distributing url: http://pconline.com.cn/
[pid 5896 time 1429543817.592000] conPool size: 26 distributing url: http://eastmoney.com/
[pid 5896 time 1429543817.646000] conPool size: 27 distributing url: http://bitauto.com/
[pid 5896 time 1429543818.759000] conPool size: 28 distributing url: http://autohome.com.cn/
[pid 5896 time 1429543818.778000] conPool size: 29 distributing url: http://39.net/
[pid 5896 time 1429543818.858000] conPool size: 30 distributing url: http://iqiyi.com/
[pid 5896 time 1429543818.949000] conPool size: 31 distributing url: http://ctrip.com/

用wing ide调试了一下，发现代码有时碰到print语句都会切换协程，很不理解。本人新手一个，代码写的很渣，求轻拍。