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gh-100344: Provide C implementation for asyncio.current_task #100345

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merged 11 commits into from
Dec 22, 2022

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itamaro
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@itamaro itamaro commented Dec 19, 2022

Implementing it in C makes it about 4x-6x faster

Microbenchmark:

# bench.py

import time
import timeit
import asyncio

ITERS: int = 10**6
NANO: int = 10**9
NANO_PER_ITER: float = NANO / ITERS

async def main():
   # avoid load attr noise
   py_current_task = asyncio.tasks._py_current_task
   c_current_task = asyncio.tasks._c_current_task

   asyncio.current_task() # warmup
   py_current_task() # warmup
   c_current_task() # warmup

   print(
      "current_task: {}ns".format(timeit.timeit(py_current_task, number=ITERS, timer=time.process_time) * NANO_PER_ITER)
   )
   print(
      "current_task: {}ns".format(timeit.timeit(c_current_task, number=ITERS, timer=time.process_time) * NANO_PER_ITER)
   )

asyncio.run(main())

a few runs on MacBook Pro
2.4 GHz 8-Core Intel Core i9
64 GB 2667 MHz DDR4:

debug build:

~/work/pyexe/main-dbg ⌚ 9:57:34
$ ./python.exe bench.py
[py] current_task: 606.234ns
[c] current_task: 104.47699999999993ns

~/work/pyexe/main-dbg ⌚ 9:57:59
$ ./python.exe bench.py
[py] current_task: 631.856ns
[c] current_task: 110.22500000000002ns

~/work/pyexe/main-dbg ⌚ 9:58:08
$ ./python.exe bench.py
[py] current_task: 637.746ns
[c] current_task: 105.03899999999999ns

~/work/pyexe/main-dbg ⌚ 9:58:16
$ ./python.exe bench.py
[py] current_task: 621.3169999999999ns
[c] current_task: 103.01300000000002ns

opt build:

~/work/pyexe/main-opt ⌚ 10:33:17
$ ./python.exe bench.py
[py] current_task: 128.743ns
[c] current_task: 31.997999999999998ns

~/work/pyexe/main-opt ⌚ 10:33:24
$ ./python.exe bench.py
[py] current_task: 126.388ns
[c] current_task: 32.64599999999998ns

~/work/pyexe/main-opt ⌚ 10:33:26
$ ./python.exe bench.py
[py] current_task: 137.053ns
[c] current_task: 32.066999999999986ns

~/work/pyexe/main-opt ⌚ 10:33:28
$ ./python.exe bench.py
[py] current_task: 131.17800000000003ns
[c] current_task: 32.06600000000001ns

Co-authored-by: @pranavtbhat

Implementing it in C makes it about 4x-6x faster

Microbenchmark:

```
 # bench.py

import time
import timeit
import asyncio

ITERS: int = 10**6
NANO: int = 10**9
NANO_PER_ITER: float = NANO / ITERS

async def main():
   # avoid load attr noise
   py_current_task = asyncio.tasks._py_current_task
   c_current_task = asyncio.tasks._c_current_task

   asyncio.current_task() # warmup
   py_current_task() # warmup
   c_current_task() # warmup

   print(
      "current_task: {}ns".format(timeit.timeit(py_current_task, number=ITERS, timer=time.process_time) * NANO_PER_ITER)
   )
   print(
      "current_task: {}ns".format(timeit.timeit(c_current_task, number=ITERS, timer=time.process_time) * NANO_PER_ITER)
   )

asyncio.run(main())
```

a few runs on MacBook Pro
2.4 GHz 8-Core Intel Core i9
64 GB 2667 MHz DDR4:

debug build:

```
~/work/pyexe/main-dbg ⌚ 9:57:34
$ ./python.exe bench.py
[py] current_task: 606.234ns
[c] current_task: 104.47699999999993ns

~/work/pyexe/main-dbg ⌚ 9:57:59
$ ./python.exe bench.py
[py] current_task: 631.856ns
[c] current_task: 110.22500000000002ns

~/work/pyexe/main-dbg ⌚ 9:58:08
$ ./python.exe bench.py
[py] current_task: 637.746ns
[c] current_task: 105.03899999999999ns

~/work/pyexe/main-dbg ⌚ 9:58:16
$ ./python.exe bench.py
[py] current_task: 621.3169999999999ns
[c] current_task: 103.01300000000002ns
```

opt build:

```
~/work/pyexe/main-opt ⌚ 10:33:17
$ ./python.exe bench.py
[py] current_task: 128.743ns
[c] current_task: 31.997999999999998ns

~/work/pyexe/main-opt ⌚ 10:33:24
$ ./python.exe bench.py
[py] current_task: 126.388ns
[c] current_task: 32.64599999999998ns

~/work/pyexe/main-opt ⌚ 10:33:26
$ ./python.exe bench.py
[py] current_task: 137.053ns
[c] current_task: 32.066999999999986ns

~/work/pyexe/main-opt ⌚ 10:33:28
$ ./python.exe bench.py
[py] current_task: 131.17800000000003ns
[c] current_task: 32.06600000000001ns
```
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🤖 New build scheduled with the buildbot fleet by @pablogsal for commit 76cbbc6 🤖

If you want to schedule another build, you need to add the :hammer: test-with-refleak-buildbots label again.

@bedevere-bot bedevere-bot removed the 🔨 test-with-refleak-buildbots Test PR w/ refleak buildbots; report in status section label Dec 19, 2022
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Congrats @itamaro! Your PR has been selected to try the new refleak buildbot label! 😉

@itamaro
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itamaro commented Dec 20, 2022

Your PR has been selected to try the new refleak buildbot label! 😉

Such an honor, thank you @pablogsal 😛

Checking out a few of the additional refleak test runs, I saw (across different buildbots): timeout, failure of test_nntplib, and failure of test_logging.
While none of these indicates new refleaks nor seems obviously related to this PR, it did nudge me to take a closer look, and I did find refleaks using:

./python.exe -m test test_asyncio.test_tasks -v -m "*current_task*" -R 3:3
...
OK
.
test_asyncio.test_tasks leaked [2990, 2988, 2990] references, sum=8968
test_asyncio.test_tasks leaked [896, 894, 894] memory blocks, sum=2684
test_asyncio.test_tasks failed (reference leak)

== Tests result: FAILURE ==

1 test failed:
    test_asyncio.test_tasks

Total duration: 23.6 sec
Tests result: FAILURE

I think the issue is not decrefing the loop when getting it from _asyncio_get_running_loop_impl. I'm pushing a fix that made it pass for me locally - let's see what the buildbots think 🤞

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I'm waiting for the benchmark test suggested by Mark in the issue.

@itamaro
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itamaro commented Dec 20, 2022

I'm waiting for the benchmark test suggested by Mark in the issue.

replied on the issue and pushed the python optimization @markshannon suggested for ~40% speedup.
my suggestion is to do both optimizations 😄

Lib/asyncio/tasks.py Outdated Show resolved Hide resolved
@kumaraditya303 kumaraditya303 self-assigned this Dec 21, 2022
@kumaraditya303 kumaraditya303 added the performance Performance or resource usage label Dec 21, 2022
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The tests need to be adjusted to test both pure python and c implementation. Also looks like there are merge conflicts.

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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

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itamaro commented Dec 21, 2022

I have made the requested changes; please review again

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Thanks for making the requested changes!

@kumaraditya303: please review the changes made to this pull request.

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LGTM, I'll wait for @gvanrossum's review before merging.

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@kumaraditya303 If you agree go ahead and merge.

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itamaro commented Dec 22, 2022

Is it still ok to push another change to revert the Python implementation as discussed on the issue, after approval?

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Is it still ok to push another change to revert the Python implementation as discussed on the issue, after approval?

That's fine, I'll review anyways before merging so go ahead!

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LGTM

@kumaraditya303 kumaraditya303 merged commit 4cc63e0 into python:main Dec 22, 2022
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Merged, thanks for working on this!

facebook-github-bot pushed a commit to facebookincubator/cinder that referenced this pull request Dec 27, 2022
…ncio.current_task

Summary:
Implementing it in C makes it about 4x-6x faster

Upstream issue: python/cpython#100344
Upstream PR (3.12): python/cpython#100345

Original summary from D39555934 (ef8c620):
Provide a native implementation of current_task as it is called frequently in the RequestContext scope guards.

Reviewed By: alexmalyshev

Differential Revision: D42229719

fbshipit-source-id: 9c3de43
iritkatriel added a commit to iritkatriel/cpython that referenced this pull request Dec 28, 2022
* Correct CVE-2020-10735 documentation (python#100306)

* pythongh-94912: Added marker for non-standard coroutine function detection (python#99247)

This introduces a new decorator `@inspect.markcoroutinefunction`,
which, applied to a sync function, makes it appear async to
`inspect.iscoroutinefunction()`.

* Docs: Don't upload CI artifacts (python#100330)

* pythongh-89727: Fix os.walk RecursionError on deep trees (python#99803)

Use a stack to implement os.walk iteratively instead of recursively to
avoid hitting recursion limits on deeply nested trees.

* pythongh-69929: re docs: Add more specific definition of \w (python#92015)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

* pythongh-89051: Add ssl.OP_LEGACY_SERVER_CONNECT (python#93927)

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Christian Heimes <christian@python.org>
Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
Fixes python#89051

* pythongh-88211: Change lower-case and upper-case to match recommendations in imaplib docs (python#99625)

* pythongh-100348: Fix ref cycle in `asyncio._SelectorSocketTransport` with `_read_ready_cb` (python#100349)

* pythongh-99925: Fix inconsistency in `json.dumps()` error messages (pythonGH-99926)

* Clarify that every thread has its own default context in contextvars (python#99246)

* pythongh-99576: Fix cookiejar file that was not truncated for some classes (pythonGH-99616)

Co-authored-by: Łukasz Langa <lukasz@langa.pl>

* pythongh-100188: Reduce misses in BINARY_SUBSCR_(LIST/TUPLE)_INT (python#100189)

Don't specialize if the index is negative.

* pythongh-99991: improve docs on str.encode and bytes.decode (python#100198)

Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>

* pythongh-91081: Add note on WeakKeyDictionary behavior when deleting a replaced entry (python#91499)

Co-authored-by: Pieter Eendebak <P.T.eendebak@tudelft.nl>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

* pythongh-85267: Improvements to inspect.signature __text_signature__ handling (python#98796)

This makes a couple related changes to inspect.signature's behaviour
when parsing a signature from `__text_signature__`.

First, `inspect.signature` is documented as only raising ValueError or
TypeError. However, in some cases, we could raise RuntimeError.  This PR
changes that, thereby fixing python#83685.

(Note that the new ValueErrors in RewriteSymbolics are caught and then
reraised with a message)

Second, `inspect.signature` could randomly drop parameters that it
didn't understand (corresponding to `return None` in the `p` function).
This is the core issue in python#85267. I think this is very surprising
behaviour and it seems better to fail outright.

Third, adding this new failure broke a couple tests. To fix them (and to
e.g. allow `inspect.signature(select.epoll.register)` as in python#85267), I
add constant folding of a couple binary operations to RewriteSymbolics.

(There's some discussion of making signature expression evaluation
arbitrary powerful in python#68155. I think that's out of scope. The
additional constant folding here is pretty straightforward, useful, and
not much of a slippery slope)

Fourth, while python#85267 is incorrect about the cause of the issue, it turns
out if you had consecutive newlines in __text_signature__, you'd get
`tokenize.TokenError`.

Finally, the `if name is invalid:` code path was dead, since
`parse_name` never returned `invalid`.

* pythonGH-100363: Speed up `asyncio.get_running_loop` (python#100364)

* pythonGH-100133: fix `asyncio` subprocess losing `stderr` and `stdout` output (python#100154)

* pythongh-100374: Fixed a bug in socket.getfqdn() (pythongh-100375)

* pythongh-100129: Add tests for pickling all builtin types and functions (pythonGH-100142)

* Remove unused variable from `dis._find_imports` (python#100396)

* pythongh-78878: Fix crash when creating an instance of `_ctypes.CField` (python#14837)

* pythonGH-69564: Clarify use of octal format of mode argument in help(os.chmod) (python#20621)

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>

* pythonGH-99554: Pack location tables more effectively (pythonGH-99556)

* Correct typo in typing.py (python#100423)

In the docstring of `ParamSpec`, the name of `P = ParamSpec('P')` was
mistakenly written as `'T'`.

* pythongh-99761: Add `_PyLong_IsPositiveSingleDigit` function to check for single digit integers  (python#100064)

* pythonGH-99770: Make the correct call specialization fail kind show up in the stats (pythonGH-99771)

* pythongh-78997: fix bad rebase of moved test file (python#100424)

* pythongh-100344: Add C implementation for `asyncio.current_task` (python#100345)

Co-authored-by: pranavtbhat

* pythonGH-99554: Trim trailing whitespace (pythonGH-100435)



Automerge-Triggered-By: GH:brandtbucher

* pythongh-85432: Harmonise parameter names between C and pure-Python implementations of `datetime.time.strftime`, `datetime.datetime.fromtimestamp` (python#99993)

* pythongh-57762: fix misleading tkinter.Tk docstring (python#98837)

Mentioned as a desired change by terryjreedy on the corresponding issue,
since Tk is not a subclass of Toplevel.

* pythongh-48496: Added example and link to faq for UnboundLocalError in reference (python#93068)

* Fix typo in 3.12 What's New (python#100449)

* pythongh-76963: PEP3118 itemsize of an empty ctypes array should not be 0 (pythonGH-5576)

The itemsize returned in a memoryview of a ctypes array is now computed from the item type, instead of dividing the total size by the length and assuming that the length is not zero.

* pythonGH-100459: fix copy-paste errors in specialization stats (pythonGH-100460)

* pythongh-99110: Initialize `frame->previous` in init_frame to fix segmentation fault when accessing `frame.f_back` (python#100182)

* pythongh-98712: Clarify "readonly bytes-like object" semantics in C arg-parsing docs (python#98710)

* pythongh-92216: improve performance of `hasattr` for type objects (pythonGH-99979)

* pythongh-100288: Specialise LOAD_ATTR_METHOD for managed dictionaries (pythonGH-100289)

* Revert "pythongh-100288: Specialise LOAD_ATTR_METHOD for managed dictionaries (pythonGH-100289)" (python#100468)

This reverts commit c3c7848.

* pythongh-94155: Reduce hash collisions for code objects (python#100183)

* Uses a better hashing algorithm to get better dispersion and remove commutativity.

* Incorporates `co_firstlineno`, `Py_SIZE(co)`, and bytecode instructions.

* This is now the entire set of criteria used in `code_richcompare`, except for `_PyCode_ConstantKey` (which would incorporate the types of `co_consts` rather than just their values).

* pythongh-83076: 3.8x speed improvement in (Async)Mock instantiation (python#100252)

* pythongh-99482: remove `jython` compatibility parts from stdlib and tests (python#99484)

* bpo-40447: accept all path-like objects in compileall.compile_file (python#19883)

Signed-off-by: Filipe Laíns <lains@archlinux.org>
Signed-off-by: Filipe Laíns <lains@riseup.net>
Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>

* pythonGH-100425: Improve accuracy of builtin sum() for float inputs (pythonGH-100426)

* pythongh-68320, pythongh-88302 - Allow for private `pathlib.Path` subclassing (pythonGH-31691)

Users may wish to define subclasses of `pathlib.Path` to add or modify
existing methods. Before this change, attempting to instantiate a subclass
raised an exception like:

    AttributeError: type object 'PPath' has no attribute '_flavour'

Previously the `_flavour` attribute was assigned as follows:

    PurePath._flavour        = xxx not set!! xxx
    PurePosixPath._flavour   = _PosixFlavour()
    PureWindowsPath._flavour = _WindowsFlavour()

This change replaces it with a `_pathmod` attribute, set as follows:

    PurePath._pathmod        = os.path
    PurePosixPath._pathmod   = posixpath
    PureWindowsPath._pathmod = ntpath

Functionality from `_PosixFlavour` and `_WindowsFlavour` is moved into
`PurePath` as underscored-prefixed classmethods. Flavours are removed.

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Co-authored-by: Brett Cannon <brett@python.org>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Eryk Sun <eryksun@gmail.com>

* pythongh-99947: Ensure unreported errors are chained for SystemError during import (pythonGH-99946)

* Add "strict" to dotproduct(). Add docstring. Factor-out common code. (pythonGH-100480)

* pythongh-94808: improve test coverage of number formatting (python#99472)

* pythongh-100454: Start running SSL tests with OpenSSL 3.1.0-beta1 (python#100456)

* pythongh-100268: Add is_integer method to int (python#100439)

This improves the lives of type annotation users of `float` - which type checkers implicitly treat as `int|float` because that is what most code actually wants. Before this change a `.is_integer()` method could not be assumed to exist on things annotated as `: float` due to the method not existing on both types.

* pythongh-77771: Add enterabs example in sched (python#92716)

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>

* pythonGH-91166: Implement zero copy writes for `SelectorSocketTransport` in asyncio (python#31871)

Co-authored-by: Guido van Rossum <gvanrossum@gmail.com>

* pythonGH-91166: Implement zero copy writes for `SelectorSocketTransport` in asyncio (python#31871)

Co-authored-by: Guido van Rossum <gvanrossum@gmail.com>

* Misc Itertools recipe tweaks (pythonGH-100493)

* pythongh-100357: Convert several functions in `bltinsmodule` to AC (python#100358)

* Remove wrong comment about `repr` in `test_unicode` (python#100495)

* pythongh-99908: Tutorial: Modernize the 'data-record class' example (python#100499)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

* pythongh-100474: Fix handling of dirs named index.html in http.server (pythonGH-100475)



If you had a directory called index.html or index.htm within a directory, it would cause http.server to return a 404 Not Found error instead of the directory listing. This came about due to not checking that the index was a regular file.

I have also added a test case for this situation.

Automerge-Triggered-By: GH:merwok

* pythongh-100287: Fix unittest.mock.seal with AsyncMock (python#100496)

* pythongh-99535: Add test for inheritance of annotations and update documentation (python#99990)

* pythongh-100428: Make float documentation more accurate (python#100437)

Previously, the grammar did not accept `float("10")`.
Also implement mdickinson's suggestion of removing the indirection.

* [Minor PR] Quotes in documentation changed into code blocks (python#99536)

Minor formatting fix in documentation

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>

* pythongh-100472: Fix docs claim that compileall parameters could be bytes (python#100473)

* pythongh-100519: simplification to `eff_request_host` in cookiejar.py (python#99588)

`IPV4_RE` includes a `.`, and the `.find(".") == -1` included here is already testing to make sure there's no dot, so this part of the expression is tautological. Instead use more modern `in` syntax to make it clear what the check is doing here. The simplified implementation more clearly matches the wording in RFC 2965.

Co-authored-by: hauntsaninja <hauntsaninja@gmail.com>

* pythongh-99308: Clarify re docs for byte pattern group names (python#99311)

* pythongh-92446: Improve argparse choices docs; revert bad change to lzma docs (python#94627)

Based on the definition of the collections.abc classes, it is more accurate to use "sequence" instead of "container" when describing argparse choices.

A previous attempt at fixing this in python#92450 was mistaken; this PR reverts that change.

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>

* Fix name of removed `inspect.Signature.from_builtin` method in 3.11.0a2 changelog (python#100525)

* pythongh-100520: Fix `rst` markup in `configparser`  docstrings (python#100524)

* pythongh-99509: Add `__class_getitem__` to `multiprocessing.queues.Queue` (python#99511)

* pythongh-94603: micro optimize list.pop (pythongh-94604)

* Remove `NoneType` redefinition from `clinic.py` (python#100551)

* pythongh-100553: Improve accuracy of sqlite3.Row iter test (python#100555)

* pythonGH-98831: Modernize a ton of simpler instructions (python#100545)

* load_const and load_fast aren't families for now
* Don't decref unmoved names
* Modernize GET_ANEXT
* Modernize GET_AWAITABLE
* Modernize ASYNC_GEN_WRAP
* Modernize YIELD_VALUE
* Modernize POP_EXCEPT (in more than one way)
* Modernize PREP_RERAISE_STAR
* Modernize LOAD_ASSERTION_ERROR
* Modernize LOAD_BUILD_CLASS
* Modernize STORE_NAME
* Modernize LOAD_NAME
* Modernize LOAD_CLASSDEREF
* Modernize LOAD_DEREF
* Modernize STORE_DEREF
* Modernize COPY_FREE_VARS (mark it as done)
* Modernize LIST_TO_TUPLE
* Modernize LIST_EXTEND
* Modernize SET_UPDATE
* Modernize SETUP_ANNOTATIONS
* Modernize DICT_UPDATE
* Modernize DICT_MERGE
* Modernize MAP_ADD
* Modernize IS_OP
* Modernize CONTAINS_OP
* Modernize CHECK_EXC_MATCH
* Modernize IMPORT_NAME
* Modernize IMPORT_STAR
* Modernize IMPORT_FROM
* Modernize JUMP_FORWARD (mark it as done)
* Modernize JUMP_BACKWARD (mark it as done)

Signed-off-by: Filipe Laíns <lains@archlinux.org>
Signed-off-by: Filipe Laíns <lains@riseup.net>
Co-authored-by: Jeremy Paige <ucodery@gmail.com>
Co-authored-by: Carlton Gibson <carlton@noumenal.es>
Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
Co-authored-by: Jon Burdo <jon@jonburdo.com>
Co-authored-by: Stanley <46876382+slateny@users.noreply.github.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Thomas Grainger <tagrain@gmail.com>
Co-authored-by: Brad Wolfe <brad.wolfe@gmail.com>
Co-authored-by: Richard Kojedzinszky <rkojedzinszky@users.noreply.github.com>
Co-authored-by: František Nesveda <fnesveda@users.noreply.github.com>
Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>
Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
Co-authored-by: Dennis Sweeney <36520290+sweeneyde@users.noreply.github.com>
Co-authored-by: Bisola Olasehinde <horlasehinde@gmail.com>
Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>
Co-authored-by: Pieter Eendebak <P.T.eendebak@tudelft.nl>
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Co-authored-by: Brett Cannon <brett@python.org>
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Co-authored-by: Eryk Sun <eryksun@gmail.com>
Co-authored-by: Sebastian Berg <sebastianb@nvidia.com>
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Co-authored-by: Jakub Kuczys <me@jacken.men>
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