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gh-64192: Make imap()/imap_unordered() in multiprocessing.pool actually lazy #136871

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gh-64192: Make imap()/imap_unordered() in multiprocessing.pool actually lazy #136871

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ccd0bbc
draft: impl lazy input consumption in mp.Pool.imap(_unordered)
Jul 20, 2025
002ef46
Use semaphore to synchronize threads
Jul 20, 2025
6e0bc58
Update buffersize behavior to match concurrent.futures.Executor behavior
Jul 21, 2025
62b2b6a
Release all `buffersize_lock` obj from the parent thread when terminate
Jul 21, 2025
0b6ba41
Add 2 basic `ThreadPool.imap()` tests w/ and w/o buffersize
Jul 21, 2025
aade15e
Fix accidental swap in imports
Jul 21, 2025
fb38a72
clear Pool._taskqueue_buffersize_semaphores safely
Jul 21, 2025
6ef488b
Slightly optimize Pool._taskqueue_buffersize_semaphores terminate
Jul 21, 2025
1716725
Rename `Pool.imap()` buffersize-related tests
Jul 21, 2025
9b43cd0
Fix typo in `IMapIterator.__init__()`
Jul 22, 2025
2d89341
Add tests for buffersize combinations with other kwargs
Jul 22, 2025
9ab2705
Remove if-branch in `_terminate_pool`
Jul 27, 2025
a955003
Add more edge-case tests for `imap` and `imap_unodered`
Jul 27, 2025
80efd6e
Split inf iterable test for `imap` and `imap_unordered`
Jul 27, 2025
83d6930
Add doc for `buffersize` argument of `imap` and `imap_unordered`
Jul 27, 2025
995ad8c
add *versionadded* for `imap_unordered`
Jul 28, 2025
3b6ad65
Remove ambiguity in `buffersize` description.
Jul 28, 2025
c941c16
Set *versionadded* as next in docs
Jul 28, 2025
d09e891
Add whatsnew entry
Jul 28, 2025
9c6d89d
Fix aggreed comments on code formatting/minor refactoring
Jul 28, 2025
4550a01
Remove `imap` and `imap_unordered` body code duplication
Jul 28, 2025
77bde4d
Merge branch 'main' into feature/add-buffersize-to-multiprocessing
obaltian Aug 31, 2025
aec39fc
Merge branch 'main' into feature/add-buffersize-to-multiprocessing
obaltian Sep 3, 2025
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Merge branch 'main' into feature/add-buffersize-to-multiprocessing
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@obaltian
obaltian authored and Oleksandr Baltian committed Aug 31, 2025
commit 77bde4d510388a513b255fb7f88a50529f1d3627
5 changes: 5 additions & 0 deletions Lib/test/_test_multiprocessing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3119,6 +3119,7 @@ def test_imap_and_imap_unordered_buffersize_value_validation(self):
method = getattr(self.pool, method_name)
method(str, range(4), buffersize=buffersize)

@warnings_helper.ignore_fork_in_thread_deprecation_warnings()
def test_imap_and_imap_unordered_when_buffer_is_full(self):
if self.TYPE != "threads":
self.skipTest("test not appropriate for {}".format(self.TYPE))
Expand Down Expand Up @@ -3154,6 +3155,7 @@ def produce_args():
p.terminate()
p.join()

@warnings_helper.ignore_fork_in_thread_deprecation_warnings()
def test_imap_and_imap_unordered_buffersize_when_buffer_is_full(self):
if self.TYPE != "threads":
self.skipTest("test not appropriate for {}".format(self.TYPE))
Expand Down Expand Up @@ -3199,6 +3201,7 @@ def test_imap_and_imap_unordered_buffersize_on_empty_iterable(self):

self.assertIsNone(next(res, None))

@warnings_helper.ignore_fork_in_thread_deprecation_warnings()
def test_imap_buffersize_on_infinite_iterable(self):
if self.TYPE != "threads":
self.skipTest("test not appropriate for {}".format(self.TYPE))
Expand All @@ -3213,6 +3216,7 @@ def test_imap_buffersize_on_infinite_iterable(self):
p.terminate()
p.join()

@warnings_helper.ignore_fork_in_thread_deprecation_warnings()
def test_imap_unordered_buffersize_on_infinite_iterable(self):
if self.TYPE != "threads":
self.skipTest("test not appropriate for {}".format(self.TYPE))
Expand All @@ -3226,6 +3230,7 @@ def test_imap_unordered_buffersize_on_infinite_iterable(self):
p.terminate()
p.join()

@warnings_helper.ignore_fork_in_thread_deprecation_warnings()
def test_make_pool(self):
expected_error = (RemoteError if self.TYPE == 'manager'
else ValueError)
Expand Down
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