[issue17674] All examples for concurrent.futures fail with "BrokenProcessPool"

[gjwebber]

gjwebber added the comment:

Damn, this was my screw up. It was a combination of two things that threw me 
off:

1. I was running my (saved) code un-gaurded, but was getting the same error as 
with the example code. I thought the problem was elsewhere.

2. As it was just example code, I was copy-pasting it into my IDE and running 
it. This caused the slightly weird looking Traceback that Richard Oudkerk 
pointed out and the same error message.

After saving and running the standard example, everything worked as expected. 
After this, I added the 'main' guard to my code and that fixed the problem 
there.

Sorry about that, looks like there's no problem after all. Tested at home on 
Win 7 and on my works machine (XP Pro).

Regards,
Gareth

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resolution:  -> rejected
status: open -> closed

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[issue17674] All examples for concurrent.futures fail with "BrokenProcessPool"

[Richard Oudkerk]

Richard Oudkerk added the comment:

@gjwebber: How exactly are you running the program to get that traceback?

The following lines make it look like you are doing something non-standard (as 
opposed to just saving the file and running it from the command line):

  File "", line 420, in run_nodebug
  File "", line 28, in 
  File "", line 24, in main

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[issue17674] All examples for concurrent.futures fail with "BrokenProcessPool"

[Brian Curtin]

Brian Curtin added the comment:

The example code works for me on 3.3.0 on Windows 8. I'd have to find a VM to 
try out XP like gjwebber - will look later.

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[issue17674] All examples for concurrent.futures fail with "BrokenProcessPool"

[Antoine Pitrou]

Antoine Pitrou added the comment:

Ok, can someone else confirm the issue on Windows?

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nosy: +brian.curtin, sbt, tim.golden

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[issue17674] All examples for concurrent.futures fail with "BrokenProcessPool"

[gjwebber]

gjwebber added the comment:

Just ran the example code linked here again for my own sanity:
http://docs.python.org/dev/library/concurrent.futures.html#processpoolexecutor-example

Exactly the same thing happened. Here is the Traceback:
Traceback (most recent call last):
  File "", line 420, in run_nodebug
  File "", line 28, in 
  File "", line 24, in main
  File "C:\Python33\lib\concurrent\futures\_base.py", line 546, in 
result_iterator
yield future.result()
  File "C:\Python33\lib\concurrent\futures\_base.py", line 399, in result
return self.__get_result()
  File "C:\Python33\lib\concurrent\futures\_base.py", line 351, in __get_result
raise self._exception
concurrent.futures.process.BrokenProcessPool: A process in the process pool was 
terminated abruptly while the future was running or pending.

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[issue17674] All examples for concurrent.futures fail with "BrokenProcessPool"

[gjwebber]

gjwebber added the comment:

As mentioned in the previously linked post, I copy-pasted the example code 
shown here:
http://docs.python.org/dev/library/concurrent.futures.html#processpoolexecutor-example

Which resulted in exactly the same error as the 'more simple' example I 
provided.

There is no mention of anything Windows specific on the documentation page, or 
any hints as to why this may not be working.

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[issue17674] All examples for concurrent.futures fail with "BrokenProcessPool"

[Antoine Pitrou]

Antoine Pitrou added the comment:

This is not the example code. The example code uses a main() function which is 
guarded by a "if" block:

if __name__ == '__main__':
main()

See http://docs.python.org/2/library/multiprocessing.html#windows for 
explanations.

Also, perhaps the concurrent.futures docs could point to that paragraph.

--
assignee:  -> docs@python
components: +Documentation -Library (Lib), Windows
nosy: +docs@python, pitrou
type: crash -> behavior
versions: +Python 3.4

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[issue17674] All examples for concurrent.futures fail with "BrokenProcessPool"

[gjwebber]

gjwebber added the comment:

Forgot to mention, the posted code works for another SO user on Debian and OS X.

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[issue17674] All examples for concurrent.futures fail with "BrokenProcessPool"

[gjwebber]

New submission from gjwebber:

Running on Windows XP 32-bit.
Uninstalled Python 2.7, installed Python 3.3.

I asked a question on stack overflow, detailing the problem and supplying 
example code and Traceback here:
http://stackoverflow.com/questions/15900366/all-example-concurrent-futures-code-is-failing-with-brokenprocesspool

More info on request if required.

--
components: Library (Lib), Windows
messages: 186397
nosy: gjwebber
priority: normal
severity: normal
status: open
title: All examples for concurrent.futures fail with "BrokenProcessPool"
type: crash
versions: Python 3.3

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