[python-users] multiprocessing shared memory ?

[Python Meeting Düsseldorf]

Hallo Joachim,

wie rufst du die Funktion denn auf ?

In deinem Skript fehlt scheinbar das:

if __name __ == '__main__':
    with_shared_memory()

Beste Grüße,
-- 
Marc-Andre Lemburg
eGenix.com

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On 3/9/2020 6:01 PM, Joachim Sasse wrote:
> Hallo,
> die kleine test funktion with_shared_memory funktioniert nicht , dh, der
> print befehl 
> wird nicht ausgeführt, also auch die gesamte Funktion nicht ?
> 
> Kann mir jemand helfen ?
> Benutze Python 3.8.2 unter Windows 10
> 
> gruss J. Sasse
> 
> from multiprocessing import Process, Queue, managers
> import time
> 
> 
> def with_shared_memory():
>     with managers.SharedMemoryManager() as smm:
>          sl = smm.ShareableList(range(2000))
>          # Divide the work among two processes, storing partial results
> in sl
>          p1 = Process(target=do_work, args=(sl, 0, 1000))
>          print (p1)
>          p2 = Process(target=do_work, args=(sl, 1000, 2000))
>          p1.start()
>          p2.start()  # A multiprocessing.Pool might be more efficient
>          p1.join()
>          p2.join()   # Wait for all work to complete in both processes
>          total_result = sum(sl)  # Consolidate the partial results now in sl
>          print (total_result)
> 
> 
> def do_work(data,von,bis):
>     print (von,bis)
>     for i in range(von,bis):
>         data.append(i)
>