chart.py spawns child process chart.py #2
Description
Seems like debug=True spawns an identical child process for chart.py. This doubles logs and other objects.
Disabling the if __name__ block avoided creating the child-child process.
Running app.run(debug=False) correctly spawns one thread, but also crashes on exit.
$ pstree -p | grep python
|-tilix(253042)-+-bash(489093)---python3(1299600)-+-QtWebEngineProc(1299640)
| | |-python3(1299672)-+-python3(1299730)-+-{python3}(1299731)
| | | | |-{python3}(1299732)
| | | | |-{python3}(1299733)
| | | | |-{python3}(1299734)
| | | | |-{python3}(1299735)
| | | | |-{python3}(1299736)
| | | | |-{python3}(1299737)
| | | | `-{python3}(1299738)
| | | |-{python3}(1299714)
| | | |-{python3}(1299715)
| | | |-{python3}(1299716)
| | | |-{python3}(1299717)
| | | |-{python3}(1299718)
| | | |-{python3}(1299719)
| | | `-{python3}(1299720)
| | |-{python3}(1299608)
| | |-{python3}(1299609)Logs:
2023-08-29 14:48:33,041 - Breksta - INFO - ==================================================
2023-08-29 14:48:33,041 - Breksta - INFO - APP SPOOLING UP!
2023-08-29 14:48:33,074 - Breksta - DEBUG - Default values: Sampling frequency: 2s, Experiment duration: 1h
2023-08-29 14:48:33,075 - Breksta - DEBUG - Sent resume signal to chart control file...
2023-08-29 14:48:33,367 - Breksta - DEBUG - chart.py is called, PID is 1299600
2023-08-29 14:48:33,368 - Breksta - INFO - Starting web process...
2023-08-29 14:48:33,956 - Breksta - DEBUG - Count: 1299672
2023-08-29 14:48:33,956 - Breksta - DEBUG - Parent process ID: 1299600
2023-08-29 14:48:34,462 - Breksta - DEBUG - Count: 1299730
2023-08-29 14:48:34,462 - Breksta - DEBUG - Parent process ID: 1299672
2023-08-29 14:54:25,057 - Breksta - DEBUG - Count: 1300443
2023-08-29 14:54:25,057 - Breksta - DEBUG - Parent process ID: 1299672
2023-08-29 14:54:25,067 - Breksta - DEBUG - THIS SHOULD NEVER APPEAR DURING APP
2023-08-29 14:54:30,984 - Breksta - INFO - APP WINDING DOWN!
2023-08-29 14:54:30,984 - Breksta - INFO - ==================================================
code:
chart.py:
...
logger = setup_logger()
logger.debug("Logger handlers: %s", logger.handlers)
pid = os.getpid()
logger.debug("Count: %s", pid)
logger.debug("Parent process ID: %s", os.getppid())
...
if __name__ == '__main__':
# Entry point for the script.
# Starts the Dash server with debugging enabled if the script is run directly.
# Autoupdate is True by default.
logger.debug("THIS SHOULD NEVER APPEAR DURING APP")
app.run_server(debug=True, threaded=True, dev_tools_hot_reload=False)$ ps -e -o pid,ppid,cmd | grep python
929 1 /usr/bin/python3 /usr/bin/networkd-dispatcher --run-startup-triggers
1314 1 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal
2324 2191 /usr/bin/python3 /usr/lib/budgie-desktop/plugins/budgie-dropby/dropover a92e3179-0824-11ed-8a51-2911653d9229
1239554 1239464 /usr/share/code/code --ms-enable-electron-run-as-node /home/matt/.vscode/extensions/ms-python.vscode-pylance-2023.8.40/dist/server.bundle.js --cancellationReceive=file:2304c672208cf6106e8850b112bec5ea4e1a3b34f7 --node-ipc --clientProcessId=1239464
1296275 489093 python3 -m app.breksta
1296319 1296275 /home/matt/Documents/git/breksta/env/lib/python3.10/site-packages/PySide6/Qt/libexec/QtWebEngineProcess --type=zygote --no-zygote-sandbox --application-name=breksta.py --webengine-schemes=qrc:sV --lang=en
1296320 1296275 /home/matt/Documents/git/breksta/env/lib/python3.10/site-packages/PySide6/Qt/libexec/QtWebEngineProcess --type=zygote --application-name=breksta.py --webengine-schemes=qrc:sV --lang=en
1296322 1296320 /home/matt/Documents/git/breksta/env/lib/python3.10/site-packages/PySide6/Qt/libexec/QtWebEngineProcess --type=zygote --application-name=breksta.py --webengine-schemes=qrc:sV --lang=en
1296349 1296322 /home/matt/Documents/git/breksta/env/lib/python3.10/site-packages/PySide6/Qt/libexec/QtWebEngineProcess --type=renderer --webengine-schemes=qrc:sV --first-renderer-process --disable-speech-api --enable-threaded-compositing --disable-databases --lang=en --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=3 --time-ticks-at-unix-epoch=-1692411585597707 --launch-time-ticks=904198081505 --shared-files --enable-features=NetworkServiceInProcess2,TracingServiceInProcess --disable-features=BackgroundFetch,ConsolidatedMovementXY,InstalledApp,PictureInPicture,WebOTP,WebPayments,WebUSB
1296355 1296275 /home/matt/Documents/git/breksta/env/bin/python3 -m app.chart
1296363 1296322 /home/matt/Documents/git/breksta/env/lib/python3.10/site-packages/PySide6/Qt/libexec/QtWebEngineProcess --type=renderer --webengine-schemes=qrc:sV --disable-speech-api --enable-threaded-compositing --disable-databases --lang=en --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=4 --time-ticks-at-unix-epoch=-1692411585597707 --launch-time-ticks=904198097157 --shared-files --enable-features=NetworkServiceInProcess2,TracingServiceInProcess --disable-features=BackgroundFetch,ConsolidatedMovementXY,InstalledApp,PictureInPicture,WebOTP,WebPayments,WebUSB
1296430 1296355 /home/matt/Documents/git/breksta/env/bin/python3 -m app.chart
1296602 1296384 grep --color=auto python