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got incorrect result with gevent  #52

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got incorrect result with gevent #52

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@torpedoallen
torpedoallen
opened on Jul 7, 2016
import time
import gevent.monkey
gevent.monkey.patch_all()

a = time.time()
mc.set('a', 1)

def add(key):
    #with lock:
    mc.incr(key)

jobs = []
for i in xrange(1000):
    jobs.append(gevent.spawn(add, 'a'))
gevent.joinall(jobs)
print mc.get('a')
mc.delete('a')
print time.time() - a

just like the code above, It gives 995 but 1001 as suppose to be. Is there any idea about this issue?

Thanks in advance.

Activity

  1. jaysonsantos commented on Jul 12, 2016

    @jaysonsantos
    jaysonsantos
    on Jul 12, 2016
    Owner

    Hey @torpedoallen I guess it is because it is because you are having a race condition, imagine you have 10 threads trying to increment on the same value (and if there is no value, it will start as 0 I think), it is not predicable which will be the outcome.

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