multiprocessing: child process race to answer
MRAB
python at mrabarnett.plus.com
Fri Nov 1 22:52:40 EDT 2013
On 02/11/2013 02:35, smhall05 wrote:
> I am using a basic multiprocessing snippet I found:
>
> #-----------------------------------------------------
> from multiprocessing import Pool
>
> def f(x):
> return x*x
>
> if __name__ == '__main__':
> pool = Pool(processes=4) # start 4 worker processes
> result = pool.apply_async(f, [10]) # evaluate "f(10)" asynchronously
> print result.get(timeout=1)
> print pool.map(f, range(10)) # prints "[0, 1, 4,..., 81]"
> #---------------------------------------------------------
>
> I am using this code to have each process go off and solve the same problem, just with different inputs to the problem. I need to be able to kill all processes once 1 of n processes has come up with the solution. There will only be one answer.
>
> I have tried:
>
> sys.exit(0) #this causes the program to hang
> pool.close()
> pool.terminate
>
Did you actually mean "pool.terminate", or is that a typo for
"pool.terminate()"?
> These still allow further processing before the program terminates. What else can I try? I am not able to share the exact code at this time. I can provide more detail if I am unclear. Thank you
>
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