Why is a Python multiprocessing daemon process not printing to standard output?

Why is a Python multiprocessing daemon process not printing to standard output?

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Why is a Python multiprocessing daemon process not printing to standard output?
Tag : python , By : Sharad
Date : November 23 2020, 01:01 AM

Does that help You can get a clearer picture of the order of events by turning on logging by placing
import multiprocessing as mp
logger = mp.log_to_stderr(logging.INFO)
[INFO/Process-1] child process calling self.run()
[INFO/MainProcess] process shutting down
Process-1 starting...
[INFO/Process-2] child process calling self.run()
[INFO/MainProcess] calling terminate() for daemon Process-1
Process-2 starting...
[INFO/MainProcess] calling join() for process Process-2
Process-2 ending...
[INFO/Process-2] process shutting down
[INFO/Process-2] process exiting with exitcode 0
[INFO/MainProcess] calling join() for process Process-1

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Zombie process in python multiprocessing daemon

Tag : python , By : Ben Humphrys
Date : March 29 2020, 07:55 AM
I wish did fix the issue. It is not possible to have 100% confidence in an answer without knowing what is going on in the child/daemon process, but consider if this could be it. Since you have worker threads in your child process, you actually need to build in some logic to join all of those threads once you receive the SIGTERM. Otherwise your process may not exit (and even if it does you may not exit gracefully). To do this you need to:
write a signal handler to be used in the child/daemon process that captures the SIGTERM signal and triggers an event for your main thread install the signal handler in the main thread (very important) of the child/daemon process the event handler for SIGTERM must issue stop instructions to ALL threads in the child/daemon process all threads must be join()ed when they are done (if you were assuming that the SIGTERM would automatically destroy everything you may have to implement this logic too) once everything is joined and cleaned up you can exit the main thread

Python multiprocessing daemon vs non-daemon vs main

Tag : python , By : jumpingmattflash
Date : March 29 2020, 07:55 AM
will be helpful for those in need I'm learning multiprocessing in Python while I found this odd behaviour between daemon and non-daemon process with respect to the main process. My Code: , When you see
[INFO/MainProcess] calling join() for process p1

Python multiprocessing.Process object with multiprocessing.Manager creates multiple multiprocessing forks in Windows Tas

Tag : python , By : PaulPlum
Date : March 29 2020, 07:55 AM
Does that help multiprocessing.Manager works by spawning a separate Manager server process, which will run until the Manager is garbage collected:

Python Multiprocessing: What is the better implementation to terminate daemon process when the parent process terminated

Tag : python , By : Moe Skeeto
Date : March 29 2020, 07:55 AM
this one helps. From the python3 docs, process.terminate() in the main's destructor:
p.start() print(p, p.is_alive()) p.terminate()

python's multiprocessing module's join() when its process is a daemon

Tag : python , By : mobi phil
Date : March 29 2020, 07:55 AM
I hope this helps . Yes, you are right. When the main process terminates, the deamon process will also terminate. This page will give you more details: Why is a Python multiprocessing daemon process not printing to standard output?
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