[issue29049] Lazy GC tracking frame

[STINNER Victor]

STINNER Victor added the comment:

FYI this optimization triggered a bug in the tp_clear slot of ElementTree 
parsers, bug which was hidden for years in Python 3: bpo-31499.

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[issue29049] Lazy GC tracking frame

[Donald Stufft]

Changes by Donald Stufft :


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pull_requests: +890

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[issue29049] Lazy GC tracking frame

[INADA Naoki]

Changes by INADA Naoki :


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status: open -> closed

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[issue29049] Lazy GC tracking frame

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5f3ac68f34f2 by INADA Naoki in branch 'default':
Issue #29049: Remove unnecessary Py_DECREF
https://hg.python.org/cpython/rev/5f3ac68f34f2

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[issue29049] Lazy GC tracking frame

[INADA Naoki]

INADA Naoki added the comment:

> It seems to me, that the part with Py_DECREF should be pushed to older 
> branches.

PyCoro_New() and PyGen_NewWithQualName() steals f reference, and DECREF when 
error.
So Py_DECREF is not needed when (gen == NULL). My patch was wrong.

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[issue29049] Lazy GC tracking frame

[Roundup Robot]

Roundup Robot added the comment:

New changeset d6913acb31e3 by INADA Naoki in branch 'default':
Issue #29049: Fix refleak introduced by f5eb0c4f5d37.
https://hg.python.org/cpython/rev/d6913acb31e3

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[issue29049] Lazy GC tracking frame

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM.

It seems to me, that the part with Py_DECREF should be pushed to older branches.

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[issue29049] Lazy GC tracking frame

[Xiang Zhang]

Xiang Zhang added the comment:

I don't have time study the patches. But 29049-fix-generator-refleak.patch 
fixes the two test failures on my PC. :-)

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[issue29049] Lazy GC tracking frame

[INADA Naoki]

Changes by INADA Naoki :


Added file: http://bugs.python.org/file46038/29049-fix-generator-refleak.patch

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[issue29049] Lazy GC tracking frame

[Xiang Zhang]

Xiang Zhang added the comment:

On my PC, this patch also introduces two tests failure:

FAIL: test_log_destroyed_pending_task 
(test.test_asyncio.test_tasks.CTask_CFuture_SubclassTests)
--
Traceback (most recent call last):
  File "/home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py", line 1823, 
in test_log_destroyed_pending_task
self.assertEqual(Task.all_tasks(loop=self.loop), set())
AssertionError: Items in the first set but not the second:
.kill_me() running 
at /home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:1796> 
wait_for=()] created at 
/home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:2001> created at 
/home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:83>

==
FAIL: test_log_destroyed_pending_task 
(test.test_asyncio.test_tasks.CTask_CFuture_Tests)
--
Traceback (most recent call last):
  File "/home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py", line 1823, 
in test_log_destroyed_pending_task
self.assertEqual(Task.all_tasks(loop=self.loop), set())
AssertionError: Items in the first set but not the second:
.kill_me() running 
at /home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:1796> 
wait_for=()] created at 
/home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:86> created at 
/home/angwer/cpython/Lib/asyncio/base_events.py:287>

==
FAIL: test_log_destroyed_pending_task 
(test.test_asyncio.test_tasks.CTask_PyFuture_Tests)
--
Traceback (most recent call last):
  File "/home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py", line 1823, 
in test_log_destroyed_pending_task
self.assertEqual(Task.all_tasks(loop=self.loop), set())
AssertionError: Items in the first set but not the second:
.kill_me() running 
at /home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:1796> 
wait_for=()] created at 
/home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:86> created at 
/home/angwer/cpython/Lib/asyncio/base_events.py:287>

==
FAIL: test_log_destroyed_pending_task 
(test.test_asyncio.test_tasks.PyTask_CFuture_Tests)
--
Traceback (most recent call last):
  File "/home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py", line 1823, 
in test_log_destroyed_pending_task
self.assertEqual(Task.all_tasks(loop=self.loop), set())
AssertionError: Items in the first set but not the second:
.kill_me() running 
at /home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:1796> 
wait_for= created at 
/home/angwer/cpython/Lib/asyncio/base_events.py:287>

==
FAIL: test_log_destroyed_pending_task 
(test.test_asyncio.test_tasks.PyTask_PyFuture_SubclassTests)
--
Traceback (most recent call last):
  File "/home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py", line 1823, 
in test_log_destroyed_pending_task
self.assertEqual(Task.all_tasks(loop=self.loop), set())
AssertionError: Items in the first set but not the second:
.kill_me() running 
at /home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:1796> 
wait_for=.Task._wakeup()] 
created at /home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:2001> 
created at /home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:83>

==
FAIL: test_log_destroyed_pending_task 
(test.test_asyncio.test_tasks.PyTask_PyFuture_Tests)
--
Traceback (most recent call last):
  File "/home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py", line 1823, 
in test_log_destroyed_pending_task
self.assertEqual(Task.all_tasks(loop=self.loop), set())
AssertionError: Items in the first set but not the second:
.kill_me() running 
at /home/angwer/cpython/Lib/test/test_asyncio/test_tasks.py:1796> 
wait_for= created at 
/home/angwer/cpython/Lib/asyncio/base_events.py:287>

==
FAIL: test_refcycle (test.test_generators.FinalizationTest)
--
Traceback (most recent call last):
  File "/home/angwer/cpython/Lib/test/test_generators.py", line 54, in 
test_refcycle
self.assertTrue(finalized)
AssertionError: False is not true

test test_generators failed
test_generators failed

2 tests failed:
test_asyncio test_generators

Total duration: 17 sec
Tests result: FAILURE

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nosy: +xiang.zhang

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[issue29049] Lazy GC tracking frame

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


--
status: closed -> open

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[issue29049] Lazy GC tracking frame

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Perhaps this change caused reference leaks:

test_exceptions leaked [1227, 1227, 1227] references, sum=3681
test_exceptions leaked [342, 344, 344] memory blocks, sum=1030
test_capi leaked [6043, 6043, 6043] references, sum=18129
test_capi leaked [1715, 1717, 1717] memory blocks, sum=5149
test_cgi leaked [68, 68, 68] references, sum=204
test_cgi leaked [34, 34, 35] memory blocks, sum=103
test_collections leaked [0, -7, 8] memory blocks, sum=1
test_contextlib leaked [2162, 2162, 2162] references, sum=6486
test_contextlib leaked [635, 637, 637] memory blocks, sum=1909
test_functools leaked [0, 3, 1] memory blocks, sum=4
test_importlib leaked [3068, 3068, 3068] references, sum=9204
test_importlib leaked [936, 938, 938] memory blocks, sum=2812
test_inspect leaked [34, 34, 34] references, sum=102
test_inspect leaked [10, 11, 10] memory blocks, sum=31
test_os leaked [182, 182, 182] references, sum=546
test_os leaked [112, 112, 112] memory blocks, sum=336
test_ssl leaked [3403, 3406, 3406] references, sum=10215
test_ssl leaked [977, 980, 980] memory blocks, sum=2937
test_threading leaked [12086, 12086, 12086] references, sum=36258
test_threading leaked [3430, 3432, 3432] memory blocks, sum=10294
test_timeout leaked [701, 701, 701] references, sum=2103
test_timeout leaked [203, 204, 204] memory blocks, sum=611
test_xml_etree leaked [3937, 3937, 3937] references, sum=11811
test_xml_etree leaked [1517, 1520, 1521] memory blocks, sum=4558
test_xml_etree_c leaked [354, 354, 354] references, sum=1062
test_xml_etree_c leaked [216, 217, 217] memory blocks, sum=650
test_yield_from leaked [33, 33, 33] references, sum=99
test_yield_from leaked [8, 8, 8] memory blocks, sum=24

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[issue29049] Lazy GC tracking frame

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Ah, sorry. Then it LGTM.

Do you have a microbenchmark that exposes a maximal effect of this change?

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[issue29049] Lazy GC tracking frame

[INADA Naoki]

INADA Naoki added the comment:

> Please wrap private functions in #ifndef Py_LIMITED_API/#endif.

No problem.  Whole Include/frameobject.h is wrapped by Py_LIMITED_API.

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[issue29049] Lazy GC tracking frame

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Please wrap private functions in #ifndef Py_LIMITED_API/#endif.

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[issue29049] Lazy GC tracking frame

[INADA Naoki]

INADA Naoki added the comment:

(Rietveld shows 500 error when replying.)

> Minor style note: Use Py_REFCNT here to simplify?

Fixed when committing.

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[issue29049] Lazy GC tracking frame

[Roundup Robot]

Roundup Robot added the comment:

New changeset f5eb0c4f5d37 by INADA Naoki in branch 'default':
Issue #29049: Call _PyObject_GC_TRACK() lazily when calling Python function.
https://hg.python.org/cpython/rev/f5eb0c4f5d37

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[issue29049] Lazy GC tracking frame

[INADA Naoki]

Changes by INADA Naoki :


--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue29049] Lazy GC tracking frame

[Josh Rosenberg]

Changes by Josh Rosenberg :


--
nosy: +josh.r

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[issue29049] Lazy GC tracking frame

[INADA Naoki]

Changes by INADA Naoki :


Added file: http://bugs.python.org/file46000/default.json.gz

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[issue29049] Lazy GC tracking frame

[INADA Naoki]

INADA Naoki added the comment:

--enable-optimizations:
$ ~/local/cpython/bin/pyperf compare_to -G default.json patched.json
Slower (12):
- pickle_dict: 42.0 us +- 0.2 us -> 42.9 us +- 0.2 us: 1.02x slower (+2%)
- regex_dna: 228 ms +- 1 ms -> 233 ms +- 2 ms: 1.02x slower (+2%)
- unpickle_list: 4.83 us +- 0.04 us -> 4.93 us +- 0.05 us: 1.02x slower (+2%)
- nbody: 175 ms +- 1 ms -> 178 ms +- 1 ms: 1.02x slower (+2%)
- unpack_sequence: 72.3 ns +- 0.4 ns -> 73.5 ns +- 4.8 ns: 1.02x slower (+2%)
- scimark_sparse_mat_mult: 5.21 ms +- 0.09 ms -> 5.27 ms +- 0.04 ms: 1.01x 
slower (+1%)
- dulwich_log: 97.2 ms +- 1.2 ms -> 98.2 ms +- 1.4 ms: 1.01x slower (+1%)
- pickle_list: 5.69 us +- 0.04 us -> 5.73 us +- 0.07 us: 1.01x slower (+1%)
- logging_format: 18.4 us +- 0.4 us -> 18.5 us +- 0.4 us: 1.01x slower (+1%)
- meteor_contest: 148 ms +- 2 ms -> 149 ms +- 2 ms: 1.01x slower (+1%)
- sympy_sum: 133 ms +- 4 ms -> 134 ms +- 5 ms: 1.00x slower (+0%)
- python_startup: 12.3 ms +- 0.1 ms -> 12.3 ms +- 0.1 ms: 1.00x slower (+0%)

Faster (42):
- call_method_slots: 9.95 ms +- 0.33 ms -> 9.36 ms +- 0.38 ms: 1.06x faster 
(-6%)
- call_method: 10.3 ms +- 0.4 ms -> 9.80 ms +- 0.53 ms: 1.05x faster (-5%)
- pickle: 15.0 us +- 0.1 us -> 14.3 us +- 0.2 us: 1.05x faster (-5%)
- call_method_unknown: 11.6 ms +- 0.3 ms -> 11.1 ms +- 0.4 ms: 1.04x faster 
(-4%)
- spectral_norm: 195 ms +- 2 ms -> 188 ms +- 1 ms: 1.04x faster (-4%)
- pathlib: 24.4 ms +- 0.3 ms -> 23.7 ms +- 0.3 ms: 1.03x faster (-3%)
- json_dumps: 17.5 ms +- 0.5 ms -> 17.0 ms +- 0.3 ms: 1.03x faster (-3%)
- regex_v8: 34.4 ms +- 0.2 ms -> 33.5 ms +- 0.4 ms: 1.03x faster (-3%)
- call_simple: 9.26 ms +- 0.30 ms -> 9.01 ms +- 0.39 ms: 1.03x faster (-3%)
- logging_silent: 456 ns +- 5 ns -> 444 ns +- 6 ns: 1.03x faster (-3%)
- richards: 106 ms +- 2 ms -> 104 ms +- 2 ms: 1.02x faster (-2%)
- django_template: 206 ms +- 8 ms -> 202 ms +- 7 ms: 1.02x faster (-2%)
- sqlite_synth: 4.74 us +- 0.16 us -> 4.64 us +- 0.10 us: 1.02x faster (-2%)
- scimark_fft: 467 ms +- 3 ms -> 457 ms +- 16 ms: 1.02x faster (-2%)
- deltablue: 10.8 ms +- 0.2 ms -> 10.6 ms +- 0.2 ms: 1.02x faster (-2%)
- regex_compile: 269 ms +- 5 ms -> 263 ms +- 2 ms: 1.02x faster (-2%)
- genshi_xml: 98.5 ms +- 1.8 ms -> 96.7 ms +- 1.0 ms: 1.02x faster (-2%)
- sympy_expand: 615 ms +- 9 ms -> 604 ms +- 11 ms: 1.02x faster (-2%)
- tornado_http: 265 ms +- 4 ms -> 261 ms +- 4 ms: 1.02x faster (-2%)
- scimark_sor: 298 ms +- 3 ms -> 294 ms +- 3 ms: 1.02x faster (-2%)
- pickle_pure_python: 704 us +- 16 us -> 693 us +- 8 us: 1.02x faster (-1%)
- crypto_pyaes: 154 ms +- 1 ms -> 152 ms +- 1 ms: 1.02x faster (-1%)
- raytrace: 753 ms +- 8 ms -> 743 ms +- 8 ms: 1.01x faster (-1%)
- nqueens: 140 ms +- 1 ms -> 138 ms +- 1 ms: 1.01x faster (-1%)
- sympy_str: 277 ms +- 6 ms -> 274 ms +- 4 ms: 1.01x faster (-1%)
- regex_effbot: 4.03 ms +- 0.12 ms -> 3.98 ms +- 0.06 ms: 1.01x faster (-1%)
- html5lib: 130 ms +- 4 ms -> 129 ms +- 4 ms: 1.01x faster (-1%)
- sqlalchemy_declarative: 237 ms +- 3 ms -> 234 ms +- 3 ms: 1.01x faster (-1%)
- scimark_monte_carlo: 153 ms +- 2 ms -> 152 ms +- 1 ms: 1.01x faster (-1%)
- hexiom: 14.8 ms +- 0.1 ms -> 14.7 ms +- 0.1 ms: 1.01x faster (-1%)
- 2to3: 446 ms +- 2 ms -> 441 ms +- 2 ms: 1.01x faster (-1%)
- mako: 29.0 ms +- 0.1 ms -> 28.8 ms +- 0.2 ms: 1.01x faster (-1%)
- go: 346 ms +- 3 ms -> 343 ms +- 4 ms: 1.01x faster (-1%)
- float: 184 ms +- 3 ms -> 183 ms +- 2 ms: 1.01x faster (-1%)
- sqlalchemy_imperative: 49.2 ms +- 1.1 ms -> 48.7 ms +- 0.9 ms: 1.01x faster 
(-1%)
- genshi_text: 46.5 ms +- 0.7 ms -> 46.1 ms +- 0.5 ms: 1.01x faster (-1%)
- telco: 9.82 ms +- 0.38 ms -> 9.74 ms +- 0.17 ms: 1.01x faster (-1%)
- chaos: 162 ms +- 1 ms -> 161 ms +- 1 ms: 1.01x faster (-1%)
- sympy_integrate: 30.0 ms +- 0.2 ms -> 29.8 ms +- 0.2 ms: 1.01x faster (-1%)
- fannkuch: 709 ms +- 2 ms -> 705 ms +- 1 ms: 1.01x faster (-1%)
- scimark_lu: 322 ms +- 8 ms -> 320 ms +- 5 ms: 1.00x faster (-0%)
- json_loads: 36.0 us +- 0.2 us -> 36.0 us +- 0.2 us: 1.00x faster (-0%)

Benchmark hidden because not significant (10): chameleon, logging_simple, 
pidigits, python_startup_no_site, unpickle, unpickle_pure_python, 
xml_etree_generate, xml_etree_iterparse, xml_etree_parse, xml_etree_process

--
Added file: http://bugs.python.org/file45999/patched.json.gz

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[issue29049] Lazy GC tracking frame

[INADA Naoki]

New submission from INADA Naoki:

Don't _PyObject_GC_TRACK(frame) before using it.
After evaluation is finished, do tracking only if refcnt is not one.

result without --enable-optimization:
$ ~/local/cpython/bin/pyperf compare_to default.json.gz patched.json.gz -G
Slower (15):
- scimark_sparse_mat_mult: 5.83 ms +- 0.03 ms -> 6.12 ms +- 0.35 ms: 1.05x 
slower (+5%)
- sympy_expand: 734 ms +- 21 ms -> 765 ms +- 40 ms: 1.04x slower (+4%)
- sympy_str: 327 ms +- 10 ms -> 339 ms +- 13 ms: 1.04x slower (+4%)
- scimark_fft: 498 ms +- 2 ms -> 512 ms +- 2 ms: 1.03x slower (+3%)
- scimark_monte_carlo: 172 ms +- 3 ms -> 175 ms +- 4 ms: 1.02x slower (+2%)
- chameleon: 17.6 ms +- 0.3 ms -> 17.9 ms +- 0.2 ms: 1.02x slower (+2%)
- telco: 11.3 ms +- 0.4 ms -> 11.5 ms +- 0.6 ms: 1.02x slower (+2%)
- logging_simple: 19.0 us +- 0.3 us -> 19.2 us +- 0.3 us: 1.01x slower (+1%)
- pickle_dict: 52.2 us +- 0.3 us -> 52.9 us +- 0.2 us: 1.01x slower (+1%)
- pickle_list: 6.86 us +- 0.04 us -> 6.94 us +- 0.05 us: 1.01x slower (+1%)
- pickle: 17.4 us +- 0.2 us -> 17.6 us +- 0.2 us: 1.01x slower (+1%)
- logging_silent: 556 ns +- 13 ns -> 561 ns +- 11 ns: 1.01x slower (+1%)
- sqlite_synth: 5.25 us +- 0.44 us -> 5.28 us +- 0.15 us: 1.01x slower (+1%)
- pidigits: 248 ms +- 2 ms -> 249 ms +- 2 ms: 1.00x slower (+0%)
- unpack_sequence: 73.5 ns +- 0.6 ns -> 73.8 ns +- 2.4 ns: 1.00x slower (+0%)

Faster (27):
- call_method_slots: 11.4 ms +- 0.1 ms -> 10.7 ms +- 0.1 ms: 1.07x faster (-6%)
- call_method: 11.5 ms +- 0.1 ms -> 10.8 ms +- 0.2 ms: 1.06x faster (-6%)
- call_simple: 10.7 ms +- 0.3 ms -> 10.1 ms +- 0.3 ms: 1.06x faster (-5%)
- regex_effbot: 4.08 ms +- 0.05 ms -> 3.97 ms +- 0.04 ms: 1.03x faster (-3%)
- regex_compile: 318 ms +- 11 ms -> 310 ms +- 10 ms: 1.03x faster (-3%)
- html5lib: 154 ms +- 4 ms -> 150 ms +- 4 ms: 1.03x faster (-3%)
- deltablue: 13.5 ms +- 0.5 ms -> 13.1 ms +- 0.4 ms: 1.03x faster (-3%)
- call_method_unknown: 13.1 ms +- 0.1 ms -> 12.8 ms +- 0.1 ms: 1.02x faster 
(-2%)
- richards: 131 ms +- 2 ms -> 128 ms +- 2 ms: 1.02x faster (-2%)
- meteor_contest: 170 ms +- 3 ms -> 167 ms +- 4 ms: 1.02x faster (-2%)
- sympy_integrate: 34.7 ms +- 0.7 ms -> 34.0 ms +- 0.2 ms: 1.02x faster (-2%)
- spectral_norm: 210 ms +- 2 ms -> 206 ms +- 2 ms: 1.02x faster (-2%)
- dulwich_log: 115 ms +- 1 ms -> 113 ms +- 2 ms: 1.01x faster (-1%)
- genshi_text: 54.1 ms +- 0.8 ms -> 53.4 ms +- 0.5 ms: 1.01x faster (-1%)
- 2to3: 511 ms +- 3 ms -> 505 ms +- 2 ms: 1.01x faster (-1%)
- pathlib: 28.8 ms +- 0.6 ms -> 28.5 ms +- 0.8 ms: 1.01x faster (-1%)
- xml_etree_parse: 199 ms +- 3 ms -> 198 ms +- 2 ms: 1.01x faster (-1%)
- hexiom: 17.9 ms +- 0.1 ms -> 17.7 ms +- 0.1 ms: 1.01x faster (-1%)
- mako: 35.1 ms +- 1.0 ms -> 34.9 ms +- 0.3 ms: 1.01x faster (-1%)
- nbody: 194 ms +- 1 ms -> 193 ms +- 1 ms: 1.01x faster (-1%)
- unpickle_pure_python: 634 us +- 15 us -> 630 us +- 10 us: 1.01x faster (-1%)
- unpickle_list: 6.16 us +- 0.06 us -> 6.13 us +- 0.05 us: 1.01x faster (-1%)
- genshi_xml: 113 ms +- 3 ms -> 112 ms +- 1 ms: 1.01x faster (-1%)
- json_dumps: 19.1 ms +- 0.3 ms -> 19.1 ms +- 0.2 ms: 1.00x faster (-0%)
- python_startup: 13.3 ms +- 0.1 ms -> 13.3 ms +- 0.1 ms: 1.00x faster (-0%)
- python_startup_no_site: 8.24 ms +- 0.06 ms -> 8.22 ms +- 0.04 ms: 1.00x 
faster (-0%)
- go: 421 ms +- 3 ms -> 421 ms +- 3 ms: 1.00x faster (-0%)

Benchmark hidden because not significant (22): chaos, crypto_pyaes, 
django_template, fannkuch, float, json_loads, logging_format, nqueens, 
pickle_pure_python, raytrace, regex_dna, regex_v8, scimark_lu, scimark_sor, 
sqlalchemy_declarative, sqlalchemy_imperative, sympy_sum, tornado_http, 
unpickle, xml_etree_generate, xml_etree_iterparse, xml_etree_process

--
files: frame-lazy-track.patch
keywords: patch
messages: 283830
nosy: haypo, inada.naoki
priority: normal
severity: normal
stage: patch review
status: open
title: Lazy GC tracking frame
type: performance
Added file: http://bugs.python.org/file45997/frame-lazy-track.patch

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