[issue37873] unittest: execute tests in parallel

[STINNER Victor]

Change by STINNER Victor :


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[issue37873] unittest: execute tests in parallel

[Bar Harel]

Change by Bar Harel :


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[issue37873] unittest: execute tests in parallel

[STINNER Victor]

STINNER Victor  added the comment:

> Leveraging GNU Parallel (https://www.gnu.org/software/parallel/) might help 
> simplify implementation. Perhaps that could be used as a subprocess call?

In general, we attempt to avoid depending on the availability of external tool. 
For example, I don't expect this tool to be available on Windows, whereas it 
would be better to support parallel execution on Windows as well.

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[issue37873] unittest: execute tests in parallel

[D. A. Pellegrino]

D. A. Pellegrino  added the comment:

Leveraging GNU Parallel (https://www.gnu.org/software/parallel/) might help 
simplify implementation. Perhaps that could be used as a subprocess call?

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[issue37873] unittest: execute tests in parallel

[Giampaolo Rodola']

Change by Giampaolo Rodola' :


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[issue37873] unittest: execute tests in parallel

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

See also 
https://mail.python.org/pipermail/python-ideas/2017-September/047100.html . One 
of the ideas in the thread was to move test.regrtest parallel execution 
functionality into unittest. I think this would be good to have it in unittest 
like support in pytest for -j.

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[issue37873] unittest: execute tests in parallel

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


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nosy: +xtreak

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[issue37873] unittest: execute tests in parallel

[STINNER Victor]

Change by STINNER Victor :


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[issue37873] unittest: execute tests in parallel

[Terry J. Reedy]

Change by Terry J. Reedy :


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[issue37873] unittest: execute tests in parallel

[Terry J. Reedy]

Terry J. Reedy  added the comment:

test.regrtest has a  -j option. Perhaps some of the Python coding for that 
could be used for unitest also.

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[issue37873] unittest: execute tests in parallel

[D. A. Pellegrino]

New submission from D. A. Pellegrino :

The unittest documentation makes reference to a potential parallelization 
feature:

"Note that shared fixtures do not play well with [potential] features like test 
parallelization and they break test isolation. They should be used with care." 
(https://docs.python.org/3/library/unittest.html)

However, it seems that executing tests in parallel is not yet a feature of 
unittest. This enhancement request is to add parallel execution of tests to 
unittest.

A command line option may be a good interface. Ideally, it would be compatible 
with test discovery. Outside of the Python ecosystem, a common practice is to 
define test cases in a Makefile and then execute GNU Make with the '-j' flag 
(https://www.gnu.org/software/make/manual/html_node/Parallel.html#Parallel). 
Adding such an option to unittest would be a convenience and may save the 
effort of bringing in additional libraries or tools for parallel unit test 
execution.

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components: Library (Lib)
messages: 349864
nosy: user93448
priority: normal
severity: normal
status: open
title: unittest: execute tests in parallel
type: enhancement
versions: Python 3.9

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