gh-98003: Inline call frames for CALL_FUNCTION_EX by Fidget-Spinner · Pull Request #98004 · python/cpython · GitHub

Issue: Inline call frames for CALL_FUNCTION_EX #98003

…-Spinner/cpython into call_function_ex_inline_3

Looks like not much difference:

Details

Benchmarks with tag 'apps':
===========================

Slower (2):
- html5lib: 59.3 ms +- 2.4 ms -> 60.4 ms +- 2.4 ms: 1.02x slower
- tornado_http: 92.9 ms +- 1.3 ms -> 93.4 ms +- 1.4 ms: 1.01x slower

Faster (1):
- 2to3: 247 ms +- 1 ms -> 246 ms +- 0 ms: 1.00x faster

Benchmark hidden because not significant (1): chameleon

Geometric mean: 1.01x slower

Benchmarks with tag 'math':
===========================

Slower (1):
- pidigits: 193 ms +- 0 ms -> 199 ms +- 0 ms: 1.03x slower

Faster (2):
- nbody: 96.2 ms +- 2.0 ms -> 94.9 ms +- 1.9 ms: 1.01x faster
- float: 71.7 ms +- 0.9 ms -> 71.3 ms +- 1.0 ms: 1.01x faster

Geometric mean: 1.00x slower

Benchmarks with tag 'regex':
============================

Slower (2):
- regex_effbot: 3.33 ms +- 0.02 ms -> 3.39 ms +- 0.02 ms: 1.02x slower
- regex_v8: 21.1 ms +- 0.1 ms -> 21.3 ms +- 0.1 ms: 1.01x slower

Faster (2):
- regex_dna: 200 ms +- 1 ms -> 198 ms +- 1 ms: 1.01x faster
- regex_compile: 128 ms +- 1 ms -> 127 ms +- 1 ms: 1.01x faster

Geometric mean: 1.00x slower

Benchmarks with tag 'serialize':
================================

Slower (2):
- pickle_list: 3.92 us +- 0.03 us -> 4.11 us +- 0.10 us: 1.05x slower
- pickle_dict: 30.3 us +- 0.1 us -> 31.1 us +- 0.1 us: 1.03x slower

Faster (3):
- xml_etree_iterparse: 105 ms +- 2 ms -> 101 ms +- 1 ms: 1.03x faster
- pickle: 10.3 us +- 0.3 us -> 10.1 us +- 0.1 us: 1.02x faster
- xml_etree_process: 53.2 ms +- 0.5 ms -> 52.4 ms +- 0.5 ms: 1.01x faster

Benchmark hidden because not significant (8): json_dumps, json_loads, pickle_pure_python, unpickle, unpickle_list, unpickle_pure_python, xml_etree_parse, xml_etree_generate

Geometric mean: 1.00x faster

Benchmarks with tag 'startup':
==============================

Slower (2):
- python_startup_no_site: 6.08 ms +- 0.01 ms -> 6.08 ms +- 0.01 ms: 1.00x slower
- python_startup: 8.45 ms +- 0.01 ms -> 8.45 ms +- 0.01 ms: 1.00x slower

Geometric mean: 1.00x slower

Benchmarks with tag 'template':
===============================

Slower (3):
- mako: 9.36 ms +- 0.05 ms -> 9.69 ms +- 0.04 ms: 1.04x slower
- genshi_xml: 48.5 ms +- 0.4 ms -> 49.5 ms +- 0.6 ms: 1.02x slower
- genshi_text: 20.9 ms +- 0.3 ms -> 21.2 ms +- 0.3 ms: 1.02x slower

Faster (1):
- django_template: 32.5 ms +- 0.4 ms -> 32.2 ms +- 0.3 ms: 1.01x faster

Geometric mean: 1.02x slower

All benchmarks:
===============

Slower (31):
- pickle_list: 3.92 us +- 0.03 us -> 4.11 us +- 0.10 us: 1.05x slower
- unpack_sequence: 45.7 ns +- 0.9 ns -> 47.9 ns +- 0.7 ns: 1.05x slower
- mako: 9.36 ms +- 0.05 ms -> 9.69 ms +- 0.04 ms: 1.04x slower
- deepcopy_reduce: 2.87 us +- 0.04 us -> 2.97 us +- 0.04 us: 1.04x slower
- go: 132 ms +- 1 ms -> 136 ms +- 1 ms: 1.03x slower
- deepcopy_memo: 33.2 us +- 0.3 us -> 34.3 us +- 0.4 us: 1.03x slower
- pidigits: 193 ms +- 0 ms -> 199 ms +- 0 ms: 1.03x slower
- pickle_dict: 30.3 us +- 0.1 us -> 31.1 us +- 0.1 us: 1.03x slower
- json: 4.62 ms +- 0.08 ms -> 4.73 ms +- 0.12 ms: 1.03x slower
- genshi_xml: 48.5 ms +- 0.4 ms -> 49.5 ms +- 0.6 ms: 1.02x slower
- html5lib: 59.3 ms +- 2.4 ms -> 60.4 ms +- 2.4 ms: 1.02x slower
- regex_effbot: 3.33 ms +- 0.02 ms -> 3.39 ms +- 0.02 ms: 1.02x slower
- logging_silent: 90.3 ns +- 0.9 ns -> 91.9 ns +- 1.8 ns: 1.02x slower
- richards: 43.0 ms +- 1.3 ms -> 43.6 ms +- 1.1 ms: 1.02x slower
- genshi_text: 20.9 ms +- 0.3 ms -> 21.2 ms +- 0.3 ms: 1.02x slower
- generators: 73.3 ms +- 0.5 ms -> 74.3 ms +- 0.2 ms: 1.01x slower
- crypto_pyaes: 73.0 ms +- 0.6 ms -> 73.9 ms +- 0.5 ms: 1.01x slower
- deepcopy: 324 us +- 3 us -> 327 us +- 4 us: 1.01x slower
- sqlglot_parse: 1.32 ms +- 0.01 ms -> 1.33 ms +- 0.01 ms: 1.01x slower
- logging_format: 6.32 us +- 0.07 us -> 6.38 us +- 0.12 us: 1.01x slower
- regex_v8: 21.1 ms +- 0.1 ms -> 21.3 ms +- 0.1 ms: 1.01x slower
- thrift: 736 us +- 13 us -> 743 us +- 17 us: 1.01x slower
- chaos: 67.4 ms +- 0.8 ms -> 67.9 ms +- 0.9 ms: 1.01x slower
- sympy_sum: 162 ms +- 2 ms -> 163 ms +- 1 ms: 1.01x slower
- tornado_http: 92.9 ms +- 1.3 ms -> 93.4 ms +- 1.4 ms: 1.01x slower
- coroutines: 23.6 ms +- 0.2 ms -> 23.8 ms +- 0.1 ms: 1.01x slower
- aiohttp: 1.00 ms +- 0.00 ms -> 1.01 ms +- 0.00 ms: 1.01x slower
- dulwich_log: 60.9 ms +- 0.4 ms -> 61.1 ms +- 0.4 ms: 1.00x slower
- gunicorn: 1.09 ms +- 0.01 ms -> 1.09 ms +- 0.01 ms: 1.00x slower
- python_startup_no_site: 6.08 ms +- 0.01 ms -> 6.08 ms +- 0.01 ms: 1.00x slower
- python_startup: 8.45 ms +- 0.01 ms -> 8.45 ms +- 0.01 ms: 1.00x slower

Faster (29):
- mdp: 2.70 sec +- 0.01 sec -> 2.53 sec +- 0.01 sec: 1.07x faster
- fannkuch: 382 ms +- 4 ms -> 366 ms +- 5 ms: 1.05x faster
- nqueens: 80.4 ms +- 1.0 ms -> 77.7 ms +- 1.2 ms: 1.03x faster
- xml_etree_iterparse: 105 ms +- 2 ms -> 101 ms +- 1 ms: 1.03x faster
- scimark_sparse_mat_mult: 4.10 ms +- 0.08 ms -> 4.00 ms +- 0.05 ms: 1.03x faster
- spectral_norm: 94.1 ms +- 2.9 ms -> 91.8 ms +- 1.2 ms: 1.03x faster
- telco: 6.50 ms +- 0.11 ms -> 6.36 ms +- 0.12 ms: 1.02x faster
- scimark_fft: 311 ms +- 5 ms -> 305 ms +- 3 ms: 1.02x faster
- pickle: 10.3 us +- 0.3 us -> 10.1 us +- 0.1 us: 1.02x faster
- xml_etree_process: 53.2 ms +- 0.5 ms -> 52.4 ms +- 0.5 ms: 1.01x faster
- pathlib: 17.7 ms +- 0.2 ms -> 17.5 ms +- 0.3 ms: 1.01x faster
- nbody: 96.2 ms +- 2.0 ms -> 94.9 ms +- 1.9 ms: 1.01x faster
- sympy_str: 282 ms +- 6 ms -> 279 ms +- 4 ms: 1.01x faster
- regex_dna: 200 ms +- 1 ms -> 198 ms +- 1 ms: 1.01x faster
- scimark_sor: 103 ms +- 2 ms -> 102 ms +- 1 ms: 1.01x faster
- async_tree_none: 517 ms +- 10 ms -> 512 ms +- 9 ms: 1.01x faster
- django_template: 32.5 ms +- 0.4 ms -> 32.2 ms +- 0.3 ms: 1.01x faster
- sympy_expand: 453 ms +- 7 ms -> 450 ms +- 6 ms: 1.01x faster
- async_tree_io: 1.31 sec +- 0.01 sec -> 1.30 sec +- 0.01 sec: 1.01x faster
- meteor_contest: 103 ms +- 1 ms -> 102 ms +- 2 ms: 1.01x faster
- regex_compile: 128 ms +- 1 ms -> 127 ms +- 1 ms: 1.01x faster
- scimark_monte_carlo: 66.2 ms +- 1.0 ms -> 65.8 ms +- 0.9 ms: 1.01x faster
- float: 71.7 ms +- 0.9 ms -> 71.3 ms +- 1.0 ms: 1.01x faster
- sqlite_synth: 2.59 us +- 0.02 us -> 2.58 us +- 0.03 us: 1.00x faster
- 2to3: 247 ms +- 1 ms -> 246 ms +- 0 ms: 1.00x faster
- hexiom: 5.99 ms +- 0.04 ms -> 5.97 ms +- 0.04 ms: 1.00x faster
- sqlglot_normalize: 104 ms +- 1 ms -> 104 ms +- 1 ms: 1.00x faster
- sympy_integrate: 20.3 ms +- 0.1 ms -> 20.3 ms +- 0.1 ms: 1.00x faster
- sqlglot_optimize: 50.9 ms +- 0.3 ms -> 50.8 ms +- 0.2 ms: 1.00x faster

Benchmark hidden because not significant (26): async_tree_cpu_io_mixed, async_tree_memoization, chameleon, coverage, deltablue, flaskblogging, json_dumps, json_loads, logging_simple, mypy, pickle_pure_python, pprint_safe_repr, pprint_pformat, pycparser, pyflate, pylint, raytrace, scimark_lu, sqlalchemy_declarative, sqlalchemy_imperative, sqlglot_transpile, unpickle, unpickle_list, unpickle_pure_python, xml_etree_parse, xml_etree_generate

Geometric mean: 1.00x slower

Perhaps we should try inlining all CALL_FUNCTION_EX, rather than specializing? Your call.

@markshannon gentle ping for a review please.

The approach I would prefer is to:

Refactor PyFunction_Type.tp_call so that it creates a frame, then calls PyEval_EvalFrame()
Use the factored out code for creating the frame in CALL_FUNCTION_EX

There is a lot unnecessary dismantling of tuples and dicts in the current approach. This is not a problem with this PR, but I think it needs to be sorted out before "inlining" the call in CALL_FUNCTION_EX

Ideally CALL_FUNCTION_EX would look something like this:

CALL_FUNCTION_EX:
   if (Py_IS_TYPE(func, &PyFunction_Type) &&
        tstate->interp->eval_frame == NULL &&
        ((PyFunctionObject *)func)->vectorcall == _PyFunction_Vectorcall) {
                _PyInterpreterFrame *new_frame = _PyEvalFramePushAndInit_TD(
                    tstate, (PyFunctionObject *)function, locals, callargs, kwargs);
                );
                Py_DECREF(callargs);
                Py_DECREF(kwargs);
                if (new_frame == NULL) {
                    goto error;
                }
                /* Enter frame */
               ...
   }
   ...

Where _PyEvalFramePushAndInit_TD pushes the frame, and calls the factored out function for initializing the frame from *args, **kwargs.

The approach I would prefer is to:

Refactor PyFunction_Type.tp_call so that it creates a frame, then calls PyEval_EvalFrame()

Use the factored out code for creating the frame in CALL_FUNCTION_EX

I'm confused. The first step is to create a frame, but then in your example code you show it creating another frame again. Why does it do that?

Because we don't really create a frame. We push a frame and then initialize it.

Pushing a frame is simple. It is initializing that is complex and we want to factor out.

Just curious, has this stalled out for now? At the very least, the changes in ceval.c will need to move to the new bytecodes.c, and you'll probably want to use the new DISPATCH_INLINED macro for inlining the call.

Totally get it if you're busy with school or something right now though! :) Just making sure that you aren't blocked on reviews or design discussions. If so, maybe we can move this forward (I'd really like to see it in)!

Totally get it if you're busy with school or something right now though! :) Just making sure that you aren't blocked on reviews or design discussions. If so, maybe we can move this forward (I'd really like to see it in)!

Yeah my exams end next week. I plan to start contributing actively again after then!

…line_3

@brandtbucher and @markshannon I think this is ready for your reviews (when you have time of course).

This approach creates a lot of intermediate objects.
I'm not sure if that is a result of the transformations in this PR, or if the original code also did created those intermediate objects.

If the objects were already being created, then maybe we should streamline it in another PR.
@Fidget-Spinner what do you think?

I think it would make sense to move the unpacking of the tuple into _PyEvalFramePushAndInit_Ex.

_PyInterpreterFrame *new_frame = _PyEvalFramePushAndInit_Ex(tstate, func, locals, callargs, kwargs).

CALL_FUNCTION_EX is quite a large instruction. Pushing more code into _PyEvalFramePushAndInit_Ex would keep it smaller.

Unpacking which tuple?

If you mean move the code above in, that would break convention with the rest of the code base. The other inline calls do these

                int code_flags = ((PyCodeObject *)PyFunction_GET_CODE(func))->co_flags;
                PyObject *locals = code_flags & CO_OPTIMIZED ? NULL : Py_NewRef(PyFunction_GET_GLOBALS(func));

before creating the new frame.

Rather than transforming callargs and kwargs into a shape suitable for _PyEvalFramePushAndInit, it might make sense to push the frame, then unpack the tuple and dict into the the frame without the intermediate objects.
It complicates the errror handling a bit, and the frame will need to be cleaned up if there is an error.

I can work on this in another PR.

Thanks for this PR. Avoiding C stack consumption for these calls is definitely something we want.

This approach creates a lot of intermediate objects.
I'm not sure if that is a result of the transformations in this PR, or if the original code also did created those intermediate objects.

If the objects were already being created, then maybe we should streamline it in another PR.
@Fidget-Spinner what do you think?

Yes these are the semantics of the original CALL_FUNCTION_EX. Most of these were copy pasted. I was surprised at how allocation heavy CALL_FUNCTION_EX is and have been thinking of ways to improve it.

Not an expert on the call sequence, but the code generally looks good to me! I'd be excited to see this in 3.12.

I'm not sure how this interacts with PEP 669, but I'm sure @markshannon can answer that pretty easily.

Also, I'd kinda like to see buildbots (for correctness) and benchmarks (for curiousity) on this before merging. I can run the benchmarks for you whenever you think it's ready.

Is this safe if len(callargs) == 0?

It should be. When len(callargs) == 0 the args shouldn't be used by the vectorcall protocol.

…line_3

Co-Authored-By: Brandt Bucher <brandt@python.org>

Not sure why all the #line directives in the generated_cases.c.h file were removed after I ran the script. Does anyone know?

Also, I'd kinda like to see buildbots (for correctness) and benchmarks (for curiousity) on this before merging. I can run the benchmarks for you whenever you think it's ready.

You can run the benchmarks but I expect no change sadly. Extended function calls are used rarely in pyperformance.

🤖 New build scheduled with the buildbot fleet by @Fidget-Spinner for commit dfd6b01 🤖

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

Not sure why all the #line directives in the generated_cases.c.h file were removed after I ran the script. Does anyone know?

The regen script needs to be run with --emit-line-directives. I think the Makefile was updated to use the new option, but maybe the Windows build scripts weren't updated with the new option (which is off by default). Maybe you know the right place to add it?

You can run the benchmarks but I expect no change sadly. Extended function calls are used rarely in pyperformance.

Understood. I just kicked off a run anyways. :)

Co-authored-by: Carl Meyer <carl@oddbird.net>

Yep, no real change on pyperformance (as expected).

Removing sprint because this issue missed the ones in 2022 and 2023.

Removing sprint because this issue missed the ones in 2022 and 2023.

Yeah this issue was added in the 2022 CPython core dev sprint which us some ways back now.

Thanks everyone!

* main: (26 commits) pythongh-104028: Reduce object creation while calling callback function from gc (pythongh-104030) pythongh-104036: Fix direct invocation of test_typing (python#104037) pythongh-102213: Optimize the performance of `__getattr__` (pythonGH-103761) pythongh-103895: Improve how invalid `Exception.__notes__` are displayed (python#103897) Adjust expression from `==` to `!=` in alignment with the meaning of the paragraph. (pythonGH-104021) pythongh-88496: Fix IDLE test hang on macOS (python#104025) Improve int test coverage (python#104024) pythongh-88773: Added teleport method to Turtle library (python#103974) pythongh-104015: Fix direct invocation of `test_dataclasses` (python#104017) pythongh-104012: Ensure test_calendar.CalendarTestCase.test_deprecation_warning consistently passes (python#104014) pythongh-103977: compile re expressions in platform.py only if required (python#103981) pythongh-98003: Inline call frames for CALL_FUNCTION_EX (pythonGH-98004) Replace Netlify with Read the Docs build previews (python#103843) Update name in acknowledgements and add mailmap (python#103696) pythongh-82054: allow test runner to split test_asyncio to execute in parallel by sharding. (python#103927) Remove non-existing tools from Sundry skiplist (python#103991) pythongh-103793: Defer formatting task name (python#103767) pythongh-87092: change assembler to use instruction sequence instead of CFG (python#103933) pythongh-103636: issue warning for deprecated calendar constants (python#103833) Various small fixes to dis docs (python#103923) ...

Specialize CALL_FUNCTION_EX

830084c

Fidget-Spinner requested a review from markshannon as a code owner October 6, 2022 23:30

bedevere-bot added the awaiting core review label Oct 6, 2022

Fidget-Spinner requested a review from brandtbucher October 6, 2022 23:31

📜🤖 Added by blurb_it.

d9fbb11

Fidget-Spinner added the sprint label Oct 6, 2022

Fidget-Spinner added 3 commits October 6, 2022 16:50

fix refleak

e724666

Merge branch 'call_function_ex_inline_3' of https://github.com/Fidget…

01cbef6

…-Spinner/cpython into call_function_ex_inline_3

re-order STACK_SHRINK to fix error case

92fead8

Fidget-Spinner added 2 commits October 7, 2022 15:04

Inline instead of specializing

84d0f8b

reduce diff

1955f19

Fidget-Spinner changed the title gh-98003: Specialize CALL_FUNCTION_EX gh-98003: Inline call frames for CALL_FUNCTION_EX Oct 7, 2022

Fidget-Spinner added 3 commits October 7, 2022 15:32

temper expectations

eb25c1b

Add newline

3f409da

remove unused variable

09b2528

Fidget-Spinner added 3 commits November 24, 2022 23:52

remove unused function prototype

f0d77dc

Merge remote-tracking branch 'upstream/main' into call_function_ex_in…

898c75d

…line_3

Use new case regenerator

b933f6e

bedevere-bot mentioned this pull request Nov 24, 2022

Inline call frames for CALL_FUNCTION_EX #98003

Closed

Fidget-Spinner added 2 commits December 1, 2022 01:47

Apply Mark's and Brandt's suggestion

06ddc00

Run --regen

bfab4dc

markshannon reviewed Dec 9, 2022

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brandtbucher approved these changes Apr 26, 2023

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bedevere-bot added awaiting merge and removed awaiting core review labels Apr 26, 2023

Fidget-Spinner and others added 2 commits April 27, 2023 17:19

Merge remote-tracking branch 'upstream/main' into call_function_ex_in…

80194fb

…line_3

Fix merge problems

dfd6b01

Co-Authored-By: Brandt Bucher <brandt@python.org>

Fidget-Spinner added the 🔨 test-with-buildbots Test PR w/ buildbots; report in status section label Apr 27, 2023

bedevere-bot removed the 🔨 test-with-buildbots Test PR w/ buildbots; report in status section label Apr 27, 2023

Update generated_cases.c.h

1afff6d

carljm reviewed Apr 29, 2023

View reviewed changes

Comment thread Python/bytecodes.c Outdated

Update Python/bytecodes.c

f1a9465

Co-authored-by: Carl Meyer <carl@oddbird.net>

Update generated_cases.c.h

94782c3

arhadthedev removed the sprint label Apr 29, 2023

Fidget-Spinner merged commit ed95e8c into python:main Apr 30, 2023

bedevere-bot removed the awaiting merge label Apr 30, 2023

Fidget-Spinner deleted the call_function_ex_inline_3 branch April 30, 2023 13:08

+                  PyObject *const *newargs = has_dict
+                      ? _PyStack_UnpackDict(tstate, _PyTuple_ITEMS(callargs),
+                          nargs, kwargs, &kwnames)
+                      : &PyTuple_GET_ITEM(callargs, 0);

+                          Py_INCREF(PyTuple_GET_ITEM(callargs, i));
+                      }
+                  }
+                  _PyInterpreterFrame *new_frame = _PyEvalFramePushAndInit(

gh-98003: Inline call frames for CALL_FUNCTION_EX by Fidget-Spinner · Pull Request #98004 · python/cpython · GitHub

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gh-98003: Inline call frames for CALL_FUNCTION_EX - #98004

gh-98003: Inline call frames for CALL_FUNCTION_EX#98004Fidget-Spinner merged 20 commits intopython:mainpython/cpython:mainfrom Fidget-Spinner:call_function_ex_inline_3Fidget-Spinner/cpython:call_function_ex_inline_3Copy head branch name to clipboard

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gh-98003: Inline call frames for CALL_FUNCTION_EX#98004
Fidget-Spinner merged 20 commits into
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