python - gevent and thread performance compare? -

i write test case compare thread , gevent's performance,
using multithread task like:

import time import threading  def sync_task():     #do     time.sleep(1)  def multi_thread_run():     start = time.time()     in range(10):         t = threading.thread(target=sync_task)         t.start()     end = time.time()     print("multi thread task executed in %f second"%(end-start)) 

print:

multi thread task executed in 0.002425 second 

however, using gevent replace thread same task:

import gevent def async_task():     #do     gevent.sleep(1)  def async_run():     start = time.time()     coroutins = []      in range(10):         coroutins.append(gevent.spawn(async_task))     gevent.joinall(coroutins)      end = time.time()     print("async task executed in %f second"%(end-start)) 

print:

async task executed in 1.002012 second 

in many blog post see coroutine more effective mutilthread, in case, how explain it?

that's because didn't join thread - means program doesn't wait thread finish executing, , instead ends immediatelly.