Python Nose tests from generator not running concurrently

Question

Given the following:

from time import sleep

def runTest(a):
    sleep(1)
    assert a >= 0

def test_all():
    for i in range(5):
        yield (runTest, i)

I would expect the five tests to get run in parallel running with nosetests --processes=8 and thus run in approximately one second — however, it takes just over five seconds to run: they appear to be running sequentially and not concurrently.

According to the nose documentation, the multiprocess plugin has supported test generators (as the nose documentation calls them) since 1.1: I'm using nose 1.3.0 so it should be supported. Adding _multiprocess_can_split_ = True does make any difference, as one would expect, as fixtures are not used.

How do I get these five tests to run concurrently?

Answer 1

根据nase的作者的说法， 在邮件列表中 ，多进程插件不适用于1.3中的生成器（ 一个已知的bug ），他建议坚持使用1.1（如果需要）。

Answer 2

You may try

from time import sleep
from multiprocessing import Process

def runTest(a):
    sleep(1)
    assert a >= 0

def test_all():
    for i in range(5):
        Process(target=(yield (runTest, i))).start()