zauberzeug
pyinstaller and cpu_bound issue
Description
I need to use pyinstaller to generate exe file, when i run the exe file, there's a question about cpu_bound, I guess it may be connected with muti-thread.
I want to know how to solve it.
My demo.py code
from nicegui import ui, run
import time
def compute_sum(a: float, b: float) -> float:
time.sleep(1) # simulate a long-running computation
return a + b
@ui.page('/')
def main_page() -> None:
async def handle_click():
result = await run.cpu_bound(compute_sum, 1, 2)
ui.notify(f'Sum is {result}')
ui.button('Compute', on_click=handle_click)
ui.run(reload=False)
my build code
import os
import subprocess
from pathlib import Path
import nicegui
cmd = [
'python',
'-m', 'PyInstaller',
'demo.py', # your main file with ui.run()
'--name', 'demo', # name of your app
'--onefile',
'--add-data', f'{Path(nicegui.__file__).parent}{os.pathsep}nicegui'
]
subprocess.call(cmd)
This is error info
D:\code\Ai\pic_to_cad\demo\dist>demo.exe
NiceGUI ready to go on http://localhost:8080, http://169.254.171.137:8080, http://169.254.246.197:8080, http://169.254.30.91:8080, http://169.254.46.222:8080, http://169.254.47.165:8080, http://169.254.5.247:8080, http://192.168.147.75:8080, http://192.168.189.1:8080, and http://192.168.19.1:8080
NiceGUI ready to go on http://localhost:8080, http://169.254.171.137:8080, http://169.254.246.197:8080, http://169.254.30.91:8080, http://169.254.46.222:8080, http://169.254.47.165:8080, http://169.254.5.247:8080, http://192.168.147.75:8080, http://192.168.189.1:8080, and http://192.168.19.1:8080
[31mERROR[0m: [Errno 10048] error while attempting to bind on address ('0.0.0.0', 8080): 通常每个套接字地址(协议/网络地址/端口)只允许使用一次。
A process in the process pool was terminated abruptly while the future was running or pending.
Traceback (most recent call last):
File "nicegui\events.py", line 413, in wait_for_result
await result
File "demo.py", line 14, in handle_click
File "nicegui\run.py", line 40, in cpu_bound
return await _run(process_pool, callback, *args, **kwargs)
File "nicegui\run.py", line 23, in _run
return await loop.run_in_executor(executor, partial(callback, *args, **kwargs))
concurrent.futures.process.BrokenProcessPool: A process in the process pool was terminated abruptly while the future was running or pending.
Does your code run fine when not packaged with pyinstaller? Is the exception happening whenever you start the program, or have you pressed CTRL-C or something else?
Does your code run fine when not packaged with pyinstaller? Is the exception happening whenever you start the program, or have you pressed CTRL-C or something else?
No packaged it works. When after I packaged it and exeacute it, it could show the right page. However, I clicked the button, it appears this error. I don't do any other operation.
Besides a confirmation from another windows user I would like to know if the error also happens if you use nicegui-pack (see https://nicegui.io/documentation/section_configuration_deployment#package_for_installation).
Besides a confirmation from another windows user I would like to know if the error also happens if you use
nicegui-pack(see https://nicegui.io/documentation/section_configuration_deployment#package_for_installation).
It has the same error even i use the nicegui-pack
I was able to replicate this error. However, after further investigation, it doesn't appear to be an issue with NiceGUI. From the PyInstaller documentation:
Currently, the only supported multi-processing framework is the multiprocessing module from the Python standard library, and even that requires you to make a multiprocessing.freeze_support() call before using any multiprocessing functionality.
I modified demp.py to include:
multiprocessing.freeze_support()
ui.run(reload=False)
This prevented the error.
@Wananrd, does this also resolve the issue for you?
I assume this problem has been resolved by now. Apparently, it wasn't an issue with NiceGUI.
