multiprocessing pyinstaller - ValueError: invalid literal for int() with base 10: 'parent_pid=12004'

Question

i have a simple script that uses multiprocessing to stress the CPU cores.

import multiprocessing
from time import sleep
import math 

class StressTestManager:

    def stressCpu(self,seconds):
        multiprocessing.freeze_support()
        processes = []
        for _ in range (multiprocessing.cpu_count()):
            sleep(0.1)
            p = multiprocessing.Process(target =self._generateCpuLoad)
            p.start()
            processes.append(p)
        sleep(seconds)
        for process in processes:
            process.terminate()
    

    def _generateCpuLoad(self):
        while True:
            a = math.sqrt(64 * 32)     
            
            
if __name__ == "__main__": 
    StressTestManager().stressCpu(10)

this works fine, but when i convert it to an exe file using pyinstaller

pyinstaller --noconfirm --onefile --console  "...FolderName/stress_test_manager.py"

and run the file, i get this error, which prints out for each Process i run

Traceback (most recent call last):
  File "stress_test_manager.py", line 38, in <module>
ValueError: invalid literal for int() with base 10: 'parent_pid=12004'
[21920] Failed to execute script 'stress_test_manager' due to unhandled exception!

i'm using Python 3.11.5

i've tried to use --onefile and --onefolder, it didn't change anything, i added multiprocessing.freeze_support() and using a local Process class as mentioned here i still get the same error.

Answer 1

i ended up using py2exe instead, it works just fine with multiprocessing.

it's not exactly a technical solution, but it's a solution to work around this error.