bpo-45636: Simpler design for `BINARY_OP`/`INPLACE_OP` by brandtbucher · Pull Request #29418 · python/cpython

brandtbucher · 2021-11-05T05:06:49Z

No perf impact:

Details

Benchmark	main	binary-op-alt
nbody	118 ms	113 ms: 1.05x faster
logging_silent	118 ns	114 ns: 1.04x faster
xml_etree_iterparse	109 ms	106 ms: 1.03x faster
go	172 ms	167 ms: 1.02x faster
richards	57.8 ms	56.8 ms: 1.02x faster
dulwich_log	67.7 ms	66.7 ms: 1.01x faster
telco	6.33 ms	6.24 ms: 1.01x faster
pickle_pure_python	369 us	364 us: 1.01x faster
scimark_sparse_mat_mult	4.74 ms	4.69 ms: 1.01x faster
hexiom	7.53 ms	7.44 ms: 1.01x faster
meteor_contest	107 ms	106 ms: 1.01x faster
xml_etree_parse	155 ms	154 ms: 1.01x faster
pickle_list	4.58 us	4.56 us: 1.01x faster
regex_compile	145 ms	144 ms: 1.00x faster
nqueens	88.5 ms	88.1 ms: 1.00x faster
sympy_sum	170 ms	169 ms: 1.00x faster
python_startup	8.53 ms	8.52 ms: 1.00x faster
python_startup_no_site	5.90 ms	5.91 ms: 1.00x slower
pickle	9.90 us	9.94 us: 1.00x slower
pidigits	194 ms	195 ms: 1.00x slower
fannkuch	417 ms	419 ms: 1.01x slower
json_dumps	12.5 ms	12.5 ms: 1.01x slower
chaos	76.5 ms	76.9 ms: 1.01x slower
unpickle	13.4 us	13.5 us: 1.01x slower
pyflate	534 ms	538 ms: 1.01x slower
mako	11.9 ms	12.0 ms: 1.01x slower
json_loads	25.4 us	25.7 us: 1.01x slower
logging_format	6.73 us	6.79 us: 1.01x slower
logging_simple	6.06 us	6.13 us: 1.01x slower
chameleon	7.53 ms	7.62 ms: 1.01x slower
scimark_fft	347 ms	352 ms: 1.01x slower
regex_dna	216 ms	219 ms: 1.01x slower
pathlib	18.7 ms	19.0 ms: 1.02x slower
unpickle_list	4.95 us	5.05 us: 1.02x slower
spectral_norm	107 ms	110 ms: 1.03x slower
scimark_monte_carlo	78.0 ms	80.4 ms: 1.03x slower
regex_v8	23.2 ms	24.2 ms: 1.04x slower
pickle_dict	27.5 us	28.7 us: 1.04x slower
regex_effbot	3.18 ms	3.34 ms: 1.05x slower
unpack_sequence	44.0 ns	48.8 ns: 1.11x slower
Geometric mean	(ref)	1.00x slower

https://bugs.python.org/issue45636

Objects/abstract.c

brandtbucher · 2021-11-05T17:39:27Z

Currently re-running benchmarks, for my own sanity…

brandtbucher · 2021-11-05T18:42:21Z

I'm glad I did. It seems that that single change contributes to the slowdown we saw on the other PR:

Details

Slower (37):
- crypto_pyaes: 87.5 ms +- 0.6 ms -> 91.3 ms +- 1.1 ms: 1.04x slower
- pickle_dict: 26.8 us +- 0.1 us -> 27.9 us +- 4.1 us: 1.04x slower
- go: 165 ms +- 1 ms -> 171 ms +- 2 ms: 1.04x slower
- richards: 56.9 ms +- 0.9 ms -> 58.8 ms +- 0.7 ms: 1.03x slower
- chameleon: 7.48 ms +- 0.10 ms -> 7.71 ms +- 0.07 ms: 1.03x slower
- regex_compile: 144 ms +- 2 ms -> 148 ms +- 1 ms: 1.03x slower
- spectral_norm: 107 ms +- 1 ms -> 110 ms +- 2 ms: 1.02x slower
- tornado_http: 109 ms +- 3 ms -> 111 ms +- 3 ms: 1.02x slower
- scimark_monte_carlo: 77.5 ms +- 0.8 ms -> 79.1 ms +- 1.4 ms: 1.02x slower
- chaos: 76.7 ms +- 0.7 ms -> 78.3 ms +- 2.5 ms: 1.02x slower
- deltablue: 4.85 ms +- 0.06 ms -> 4.95 ms +- 0.07 ms: 1.02x slower
- nbody: 115 ms +- 2 ms -> 118 ms +- 3 ms: 1.02x slower
- sympy_expand: 501 ms +- 5 ms -> 510 ms +- 5 ms: 1.02x slower
- float: 80.5 ms +- 0.9 ms -> 81.8 ms +- 0.9 ms: 1.02x slower
- json_loads: 25.4 us +- 0.2 us -> 25.8 us +- 0.2 us: 1.02x slower
- pickle_pure_python: 367 us +- 3 us -> 373 us +- 4 us: 1.02x slower
- regex_dna: 212 ms +- 1 ms -> 215 ms +- 2 ms: 1.01x slower
- pyflate: 539 ms +- 9 ms -> 545 ms +- 4 ms: 1.01x slower
- unpickle_pure_python: 272 us +- 3 us -> 275 us +- 3 us: 1.01x slower
- sqlite_synth: 2.74 us +- 0.04 us -> 2.77 us +- 0.07 us: 1.01x slower
- sympy_integrate: 22.0 ms +- 0.2 ms -> 22.2 ms +- 0.1 ms: 1.01x slower
- django_template: 37.2 ms +- 0.5 ms -> 37.6 ms +- 0.4 ms: 1.01x slower
- scimark_sparse_mat_mult: 4.84 ms +- 0.08 ms -> 4.89 ms +- 0.14 ms: 1.01x slower
- xml_etree_iterparse: 107 ms +- 3 ms -> 108 ms +- 3 ms: 1.01x slower
- pickle_list: 4.48 us +- 0.04 us -> 4.52 us +- 0.03 us: 1.01x slower
- sympy_str: 303 ms +- 4 ms -> 306 ms +- 3 ms: 1.01x slower
- meteor_contest: 106 ms +- 2 ms -> 106 ms +- 2 ms: 1.01x slower
- unpickle_list: 5.05 us +- 0.04 us -> 5.08 us +- 0.07 us: 1.01x slower
- xml_etree_process: 59.1 ms +- 0.6 ms -> 59.5 ms +- 0.4 ms: 1.01x slower
- xml_etree_generate: 80.4 ms +- 0.7 ms -> 80.9 ms +- 1.0 ms: 1.01x slower
- 2to3: 271 ms +- 1 ms -> 273 ms +- 1 ms: 1.01x slower
- hexiom: 7.53 ms +- 0.12 ms -> 7.57 ms +- 0.07 ms: 1.01x slower
- sympy_sum: 170 ms +- 2 ms -> 171 ms +- 2 ms: 1.01x slower
- dulwich_log: 67.6 ms +- 0.3 ms -> 67.9 ms +- 0.4 ms: 1.00x slower
- regex_v8: 23.2 ms +- 0.1 ms -> 23.3 ms +- 0.2 ms: 1.00x slower
- python_startup: 8.51 ms +- 0.01 ms -> 8.54 ms +- 0.01 ms: 1.00x slower
- python_startup_no_site: 5.90 ms +- 0.00 ms -> 5.91 ms +- 0.00 ms: 1.00x slower

Faster (6):
- scimark_fft: 355 ms +- 10 ms -> 346 ms +- 2 ms: 1.03x faster
- fannkuch: 427 ms +- 4 ms -> 417 ms +- 2 ms: 1.02x faster
- pidigits: 190 ms +- 0 ms -> 187 ms +- 0 ms: 1.01x faster
- json_dumps: 12.6 ms +- 0.1 ms -> 12.5 ms +- 0.1 ms: 1.01x faster
- pathlib: 19.0 ms +- 0.3 ms -> 18.8 ms +- 0.2 ms: 1.01x faster
- mako: 11.9 ms +- 0.1 ms -> 11.9 ms +- 0.1 ms: 1.00x faster

Benchmark hidden because not significant (15): logging_format, logging_silent, logging_simple, nqueens, pickle, raytrace, regex_effbot, scimark_lu, scimark_sor, sqlalchemy_declarative, sqlalchemy_imperative, telco, unpack_sequence, unpickle, xml_etree_parse

Geometric mean: 1.01x slower

It's not clear to me why. Perhaps int is that much faster than uint16_t?

arhadthedev · 2021-11-07T09:11:00Z

@brandtbucher Maybe the change created a branching point with random targets, so CPU branch predictor just gives up with prefetching. A profiler will help to find exact lines with the longest execution time.

markshannon

I suspect the awkward size of nb_name_info may be responsible for most of the slowdown.

markshannon · 2021-11-08T11:10:54Z

Objects/abstract.c

+#undef NB_NAME_INFO
+
+PyObject *
+_PyNumber_Op(PyObject *o1, PyObject *o2, unsigned op)


This just forwards to binary_op. You might want to consider:

Make this the function that does the work (effectively inlining binary_op here).

Make the old API PyNumber_TrueDivide, etc. call _PyNumber_Op

Delete binary_op.

Objects/abstract.c

markshannon · 2021-11-08T11:34:27Z

Objects/abstract.c

+}
+
+PyObject *
+_PyNumber_InPlaceOp(PyObject *o1, PyObject *o2, unsigned op)


Same comment as for _PyNumber_Op.

bedevere-bot · 2021-11-08T11:34:46Z

When you're done making the requested changes, leave the comment: I have made the requested changes; please review again.

brandtbucher · 2021-11-09T01:08:03Z

See my new (preferred) approach in #29482.

brandtbucher · 2021-11-09T02:27:52Z

You were right @markshannon: adjusting the alignment fixes the slowdown. Nice catch.

Details

Slower (25):
- pickle_dict: 26.8 us +- 0.1 us -> 28.0 us +- 0.1 us: 1.04x slower
- go: 165 ms +- 1 ms -> 172 ms +- 2 ms: 1.04x slower
- regex_effbot: 3.15 ms +- 0.03 ms -> 3.25 ms +- 0.04 ms: 1.03x slower
- regex_dna: 212 ms +- 1 ms -> 219 ms +- 1 ms: 1.03x slower
- scimark_lu: 138 ms +- 3 ms -> 143 ms +- 5 ms: 1.03x slower
- float: 80.5 ms +- 0.9 ms -> 82.8 ms +- 1.1 ms: 1.03x slower
- logging_format: 6.73 us +- 0.09 us -> 6.89 us +- 0.08 us: 1.02x slower
- chameleon: 7.48 ms +- 0.10 ms -> 7.64 ms +- 0.09 ms: 1.02x slower
- regex_v8: 23.2 ms +- 0.1 ms -> 23.7 ms +- 0.4 ms: 1.02x slower
- tornado_http: 109 ms +- 3 ms -> 111 ms +- 3 ms: 1.02x slower
- scimark_monte_carlo: 77.5 ms +- 0.8 ms -> 79.0 ms +- 1.3 ms: 1.02x slower
- nqueens: 90.1 ms +- 0.7 ms -> 91.3 ms +- 1.0 ms: 1.01x slower
- django_template: 37.2 ms +- 0.5 ms -> 37.7 ms +- 0.6 ms: 1.01x slower
- sympy_expand: 501 ms +- 5 ms -> 507 ms +- 3 ms: 1.01x slower
- sqlalchemy_imperative: 18.6 ms +- 0.5 ms -> 18.8 ms +- 0.6 ms: 1.01x slower
- richards: 56.9 ms +- 0.9 ms -> 57.6 ms +- 1.4 ms: 1.01x slower
- regex_compile: 144 ms +- 2 ms -> 146 ms +- 2 ms: 1.01x slower
- unpack_sequence: 43.7 ns +- 0.9 ns -> 44.2 ns +- 1.1 ns: 1.01x slower
- xml_etree_generate: 80.4 ms +- 0.7 ms -> 81.2 ms +- 0.8 ms: 1.01x slower
- json_loads: 25.4 us +- 0.2 us -> 25.6 us +- 0.2 us: 1.01x slower
- mako: 11.9 ms +- 0.1 ms -> 12.0 ms +- 0.0 ms: 1.01x slower
- pickle_list: 4.48 us +- 0.04 us -> 4.52 us +- 0.04 us: 1.01x slower
- scimark_sparse_mat_mult: 4.84 ms +- 0.08 ms -> 4.88 ms +- 0.05 ms: 1.01x slower
- logging_simple: 6.15 us +- 0.08 us -> 6.19 us +- 0.07 us: 1.01x slower
- unpickle_list: 5.05 us +- 0.04 us -> 5.07 us +- 0.05 us: 1.00x slower

Faster (15):
- scimark_fft: 355 ms +- 10 ms -> 345 ms +- 2 ms: 1.03x faster
- fannkuch: 427 ms +- 4 ms -> 419 ms +- 4 ms: 1.02x faster
- xml_etree_iterparse: 107 ms +- 3 ms -> 105 ms +- 2 ms: 1.02x faster
- telco: 6.38 ms +- 0.25 ms -> 6.28 ms +- 0.11 ms: 1.02x faster
- pickle: 9.97 us +- 0.16 us -> 9.84 us +- 0.11 us: 1.01x faster
- pidigits: 190 ms +- 0 ms -> 188 ms +- 0 ms: 1.01x faster
- xml_etree_parse: 155 ms +- 3 ms -> 153 ms +- 1 ms: 1.01x faster
- crypto_pyaes: 87.5 ms +- 0.6 ms -> 86.6 ms +- 1.1 ms: 1.01x faster
- hexiom: 7.53 ms +- 0.12 ms -> 7.47 ms +- 0.06 ms: 1.01x faster
- raytrace: 331 ms +- 2 ms -> 329 ms +- 1 ms: 1.01x faster
- json_dumps: 12.6 ms +- 0.1 ms -> 12.5 ms +- 0.1 ms: 1.01x faster
- spectral_norm: 107 ms +- 1 ms -> 107 ms +- 1 ms: 1.01x faster
- python_startup: 8.51 ms +- 0.01 ms -> 8.49 ms +- 0.01 ms: 1.00x faster
- dulwich_log: 67.6 ms +- 0.3 ms -> 67.4 ms +- 0.6 ms: 1.00x faster
- python_startup_no_site: 5.90 ms +- 0.00 ms -> 5.89 ms +- 0.00 ms: 1.00x faster

Benchmark hidden because not significant (18): 2to3, chaos, deltablue, logging_silent, meteor_contest, nbody, pathlib, pickle_pure_python, pyflate, scimark_sor, sqlalchemy_declarative, sqlite_synth, sympy_integrate, sympy_sum, sympy_str, unpickle, unpickle_pure_python, xml_etree_process

Geometric mean: 1.00x slower

brandtbucher · 2021-11-11T02:26:08Z

Closing in favor of #29482.

brandtbucher added 8 commits October 27, 2021 13:16

Merge BINARY_*/INPLACE_* into BINARY_OP/INPLACE_OP

4b7125f

Clean things up a bit

3a87083

Improve the new _PyNumber_*Op implementations

a2df29a

Add docs

1b8934e

blurb add

3137973

Fix API leak

9905549

Clean up the nb_info struct

f697036

Clean up some comments

33f6e7c

brandtbucher requested a review from markshannon as a code owner November 5, 2021 05:06

the-knights-who-say-ni added the CLA signed label Nov 5, 2021

bedevere-bot added the awaiting core review label Nov 5, 2021

brandtbucher mentioned this pull request Nov 5, 2021

bpo-45636: Merge BINARY_*/INPLACE_* into BINARY_OP/INPLACE_OP #29255

Closed

markshannon reviewed Nov 5, 2021

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Objects/abstract.c Outdated Show resolved Hide resolved

Split up operator slots and names

bd8e9c7

HannahGraham23 approved these changes Nov 6, 2021

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python deleted a comment from HannahGraham23 Nov 6, 2021

markshannon self-assigned this Nov 8, 2021

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brandtbucher added 2 commits November 8, 2021 16:16

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brandtbucher mentioned this pull request Nov 9, 2021

bpo-45636: BINARY_OP (third time's the charm) #29482

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bpo-45636: Simpler design for `BINARY_OP`/`INPLACE_OP`#29418

bpo-45636: Simpler design for `BINARY_OP`/`INPLACE_OP`#29418
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