gevent 用法

例子：

import time
import gevent
from gevent.threadpool import ThreadPool


pool = ThreadPool(3)
start = time.time()
for _ in range(4):
    pool.spawn(time.sleep, 1)
gevent.wait()
delay = time.time() - start
print('Running "time.sleep(1)" 4 times with 3 threads. Should take about 2 seconds: %.3fs' % delay)
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运行结果：

3个线程执行4个睡1s的操做：

（1）第一次，3个睡1s。使用了3个线程，满了，耗时1s

（2）第二次，1个睡1s。使用1个线程，耗时1s

（3）中间切换须要0.00x秒。

（4）理论总共耗时(2+0.00x)秒。

Running "time.sleep(1)" 4 times with 3 threads. Should take about 2 seconds: 2.004s

Process finished with exit code 0

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