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input() call blocks multiprocessing #71070

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the mannequin opened this issue Apr 29, 2016 · 1 comment
Open

input() call blocks multiprocessing #71070

the mannequin opened this issue Apr 29, 2016 · 1 comment
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OS-windows topic-multiprocessing type-bug An unexpected behavior, bug, or error

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@the
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Mannequin

the mannequin commented Apr 29, 2016

BPO 26883
Nosy @pfmoore, @tjguk, @zware, @zooba

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2016-04-29.09:54:24.724>
labels = ['type-bug', 'OS-windows']
title = 'input() call blocks multiprocessing'
updated_at = <Date 2016-04-29.09:54:24.724>
user = 'https://bugs.python.org/the'

bugs.python.org fields:

activity = <Date 2016-04-29.09:54:24.724>
actor = 'the'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Windows']
creation = <Date 2016-04-29.09:54:24.724>
creator = 'the'
dependencies = []
files = []
hgrepos = []
issue_num = 26883
keywords = []
message_count = 1.0
messages = ['264480']
nosy_count = 5.0
nosy_names = ['paul.moore', 'tim.golden', 'zach.ware', 'steve.dower', 'the']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue26883'
versions = ['Python 3.4', 'Python 3.5']
@the
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the mannequin commented Apr 29, 2016

If input is called right away after applying a single job to multiprocessing.Pool or submitting concurrent.futures.ProcessPoolExecutor then the processes are not started. If multiple jobs are submitted everything works fine.

This only seems to be a problem on Windows (probably only 10) and python version 3.x

See my stackoverflow question: http://stackoverflow.com/questions/36919678/python-multiprocessing-pool-does-not-start-right-away

@the the mannequin added OS-windows type-bug An unexpected behavior, bug, or error labels Apr 29, 2016
@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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OS-windows topic-multiprocessing type-bug An unexpected behavior, bug, or error
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