MultiProcess error

[19kobayashi]

I want to run OpenPIVgui using MultiProcess but it doesn’t work.(I can run this program using only 1 core)

This is the error message
‘PIV evaluation thread stopped. cannot pickle '_tkinter.tkapp' object’

I found this error occurs at line 224 in ‘OpenPivGui.py’ (line 496 in ’openpiv.tools’ exactly).
‘mp.run(func=mp.process, n_cpus=cpu_count)’ in ‘OpenPivGui.py’.
‘res = pool.map(func, image_pairs)’ in ‘openpiv.tools.py’

Would you teach me how can I run OpenPIVgui using MultiProcess?

Version
Python: 3.9
Windows:10
OpenPIVgui:0.4.11

[ErichZimmer]

I am not sure if the GUI runs on Python > 3.9, so I'll investigate once I'll get time.

[ErichZimmer]

I am able to replicate the issue on python 3.8.5 and 3.9 with the following environment:
OS: Windows 10 Pro (unactivated)
Python: 3.8.5, 3.9
OpenPIV: 0.23.8
OpenPivGui: 0.4.11
Note: I installed OpenPIV first, then OpenPivGui due to cellular data restrictions

The question is why did the GUI work before, but not now?

[ErichZimmer]

Error is traced back to openpiv.tools.multiprocessor, but nothing seemed to have been changed. I can't figure out a way around it other than using alternative process-based parallel processing packages.
Perhaps, @GregorBecker can help with this specific issue?

[alexlib]

I think that since we have 0.4.13 - we can close this issue.