Hi,
If you are on windows, I recall that we can’t use multiprocessing inside a
function, it should be in the main body of code or after if ‘__name__’ ==
‘__main__’ block.
Also, it is necessary to ensure that the function being used with
multiprocessing can be pickled, if it cant be multiprocessing won’t work
with it.
On Tue, 6 May 2025 at 1:39 am, Ran Waidman via Python.NET <
pythonnet@python.org> wrote:
> Hi, I am using Python.Runtime in C#,
>
> I would like to call 1 function from my script, this function must work in
> multip process.
> when I call it, it looks like that the sw keep opening new processes
> forever till my computer has to be restarted it is like a virus,
>
> my python code:
> import math
> import multiprocessing
> import time
> from multiprocessing import pool
>
> import cv2
> import numpy as np
> import os
> from PIL import Image
>
> from GraininessFunction import GraininessFunction
>
>
> #multiprocessing.set_start_method('spawn', force=True) # or 'fork' on Unix
>
> def getString():
>
> return "Hello from Python!"
>
> def worker(x):
> print(f"Processing {x} in PID {os.getpid()}")
> return x * x
>
> def multiProcessTest():
> multiprocessing.freeze_support()
> #multiprocessing.freeze_support()
> args = [1,2,3,4]
> processes = []
>
> print(f"multiProcessTest in PID {os.getpid()}")
>
> for item in args:
> print("creating process for:"+str(item))
> p = multiprocessing.Process(target=worker, args=(item,))
> p.start()
> processes.append(p)
>
> for p in processes:
> p.join()
> #with multiprocessing.Pool(processes=2) as pool:
> # pool.map(worker, args)
>
> #multiprocessing.freeze_support()
> #if multiprocessing.get_start_method(allow_none=True) != 'spawn':
> # multiprocessing.set_start_method('spawn', force=True)
>
>
> my C# code:
>
> var ret = module.getString();
>
> Console.WriteLine($"Result from Python: {ret}");
>
> module.multiProcessTest();
>
> Console.WriteLine($"end multiProcessTest");
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