Processes only start working after checking status

[chenxi-shi]

When using
subprocess.Popen(["jug", "execute", "exmp.py"], stderr=STDOUT, creationflags=CREATE_NEW_CONSOLE)
runing jug process, the subprocess will only starts after checking status.
The same thing happens when running by
subprocess.Popen(["jug", "execute", "exmp.py"], stderr=STDOUT, shell=True)

This problem doesn't appear when using
subprocess.Popen(["jug", "execute", "exmp.py"], stderr=STDOUT)

Would you mind to help?

[luispedro]

I find it very surprising that there is a difference between these. What exactly do you mean by "checking status"?

Can you add the --verbose=info flag and see what happens?

[chenxi-shi]

Thank you for replying!
My "checking status" means the execution of "jug status exmp.py".

The subprocess code is in a file called "call_exmp.py", and the following is the print and I bold the time for your reference.

\Jug_task>python call_exmp.py
call_exmp starts: 1518618461.5917778
process 9244: ['jug', 'execute', 'exmp.py', '--will-cite', '--verbose=INFO', '--debug']
process 4060: ['jug', 'execute', 'exmp.py', '--will-cite', '--verbose=INFO', '--debug']
process 11384: ['jug', 'execute', 'exmp.py', '--will-cite', '--verbose=INFO', '--debug']
process 12916: ['jug', 'execute', 'exmp.py', '--will-cite', '--verbose=INFO', '--debug']
\Jug_task>jug status exmp.py
Start: 1518618481.4294322
Spend 0.0019981861114501953
Waiting Ready Finished Running Task name
.................................................................................................
0 3 0 2 exmp.do_something
1 0 0 0 exmp.join
.................................................................................................
1 3 0 2 Total
C:\Mywork\tasks\Jug_task>

Here is the verbose information on one process.

Start: 1518618481.130434
Spend 0.006001472473144531
INFO:root:Execute start (6 tasks)
INFO:root:Executing exmp.do_something...
0 Finished
INFO:root:Already in execution exmp.do_something...
INFO:root:Already in execution exmp.do_something...
INFO:root:Already in execution exmp.do_something...
INFO:root:Executing exmp.do_something...
6.343236446380615sec - Process 4: 1
7.344218969345093sec - Process 4: 2
8.34446907043457sec - Process 4: 3
9.345445156097412sec - Process 4: 4
4 Finished
INFO:root:Executing exmp.join...
___________________________This is join

I will also attach my test code in another comment for your reference.

[chenxi-shi]

Here are the screenshots of files
call_exmp.py

exmp.py

Thanks!

[chenxi-shi]

Updating:

This problem will be solved when I add process.poll(). It is like checking process would trigger the tasks' starting.

[luispedro]

Sorry, I cannot be more constructive, but I don't see why it shouldn't work as expected or why process.poll() would make a difference. If it's a windows thing then I cannot really help, though.

[chenxi-shi]

I am working on Windows. It doesn't matter since I could just use process.poll() to trigger processes. Thanks.

[luispedro]

Closing as I don't feel I have enough information to fix any underlying issue.