[Bug 1638695] Re: Python 2.7.12 performance regression

Louis Bouchard louis.bouchard at canonical.com
Mon Feb 27 16:38:23 UTC 2017 

Following the results of the previous comparison, i've used Jorge's
profiling example on the 'call_method' bench for trusty stock, no LTO,
no PGO and Xenial stock, no PGO and no LTO. Here are the results. Notice
the difference between Trusty Stock & Trusty nopgo, as opposed to the
execution profiles of the other tests.

Trusty Stock
============
callgrind_annotate:
Profiled target:  /home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python /home/ubuntu/venv/cpython2.7-d0d7712d4e1d/li
b/python2.7/site-packages/performance/benchmarks/bm_call_method.py --worker --pipe 4 --worker-task=0 --samples 3 --
warmups 1 --loops 1 --min-time 0.1 (PID 25150, part 1)
4,918,198,605  ???:PyEval_EvalFrameEx'2 [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
1,180,507,700  ???:0x00000000005368f0 [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
1,109,707,368  ???:PyObject_GetAttr [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
  823,065,734  ???:PyFrame_New [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
  552,755,137  ???:0x00000000004a5c90 [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7] 
  525,836,692  ???:0x00000000004bedf0 [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
   12,732,711  ???:PyParser_AddToken [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
    6,120,934  ???:PyDict_GetItem [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
    4,700,333  ???:0x00000000004bc0e0 [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
    4,647,564  ???:0x00000000004afe90'2 [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
    3,724,240  ???:PyObject_Free [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
    3,526,112  ???:PyDict_SetItem [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
    3,407,575  ???:0x0000000000571fd0 [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
    3,304,198  ???:PyObject_Hash [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
    3,055,436  ???:0x00000000005495a0 [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]
    2,796,306  ???:0x0000000000535070 [/home/ubuntu/venv/cpython2.7-d0d7712d4e1d/bin/python2.7]

Trusty nopgo:
=============
Profiled target:  /home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python /home/ubuntu/venv/cpython2.7-d217262e7ee7/li
b/python2.7/site-packages/performance/benchmarks/bm_call_method.py --worker --pipe 4 --worker-task=0 --samples 3 --
warmups 1 --loops 1 --min-time 0.1 (PID 28073, part 1)
5,362,602,828  ???:PyEval_EvalFrameEx'2 [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
1,250,195,637  ???:0x0000000000585e90 [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
  890,479,191  ???:PyFrame_New [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
  836,574,419  ???:PyObject_GenericGetAttr [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
  552,808,267  ???:0x000000000049ef00 [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
  539,318,922  ???:0x0000000000493710 [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
  488,401,927  ???:_PyType_Lookup [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
  258,028,053  ???:PyObject_GetAttr [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
   12,247,026  ???:0x00000000005937f0 [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
   11,727,983  ???:PyParser_AddToken [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
    6,409,083  ???:PyDict_GetItem [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
    4,948,165  ???:PyObject_Malloc [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
    4,746,403  ???:0x00000000004f7b70'2 [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
    4,525,638  ???:PyNode_AddChild [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
    4,429,698  ???:PyObject_Free [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
    3,582,953  ???:0x000000000041aff0 [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]
    3,240,230  ???:PyObject_Hash [/home/ubuntu/venv/cpython2.7-d217262e7ee7/bin/python2.7]

Trusty nolto:
=============
Profiled target:  /home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7 /home/ubuntu/venv/cpython2.7-d8da6ef977cc
/lib/python2.7/site-packages/performance/benchmarks/bm_call_method.py --worker --pipe 4 --worker-task=0 --samples 3
 --warmups 1 --loops 1 --min-time 0.1 (PID 27353, part 1)
4,930,764,066  ???:PyEval_EvalFrameEx'2 [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
1,059,123,292  ???:0x0000000000486370 [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
  879,185,389  ???:PyObject_GetAttr [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
  823,049,135  ???:PyFrame_New [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
  552,712,907  ???:0x0000000000477410 [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
  539,326,714  ???:PyMethod_New [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
  472,694,320  ???:_PyType_Lookup [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
  148,897,549  ???:PyObject_GC_UnTrack [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
   40,448,799  ???:0x00000000004877d0 [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
   10,899,345  ???:PyParser_AddToken [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
   10,348,722  ???:PyDict_GetItem [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
    4,662,730  ???:0x00000000004cd110 [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
    4,637,942  ???:0x000000000050b720'2 [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
    4,432,451  ???:PyObject_Free [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
    4,094,020  ???:PyDict_SetItem [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
    3,629,015  ???:PyNode_AddChild [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
    3,408,211  ???:0x00000000004a2260 [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
    3,232,715  ???:PyObject_Malloc [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
    3,206,499  ???:PyObject_Hash [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]
    3,055,436  ???:0x000000000050b610 [/home/ubuntu/venv/cpython2.7-d8da6ef977cc/bin/python2.7]

Xenial Stock
============
Profiled target:  /home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python /home/ubuntu/venv/cpython2.7-abc0c129a9a8/li
b/python2.7/site-packages/performance/benchmarks/bm_call_method.py --worker --pipe 4 --worker-task=0 --samples 3 --
warmups 1 --loops 1 --min-time 0.1 (PID 28373, part 1)
5,293,380,177  ???:PyEval_EvalFrameEx'2 [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
1,058,376,436  ???:0x00000000004d9030 [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  850,012,013  ???:PyFrame_New [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  823,053,334  ???:_PyObject_GenericGetAttrWithDict [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  525,847,184  ???:PyMethod_New [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  471,794,110  ???:0x00000000004e1030 [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  461,203,120  ???:_PyType_Lookup [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  312,611,371  ???:PyObject_GetAttr [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  148,905,231  ???:PyObject_GC_UnTrack [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
   40,444,971  ???:0x00000000004e09c0 [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
   12,120,701  ???:PyDict_GetItem [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
   10,987,593  ???:PyParser_AddToken [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    6,574,452  ???:PyObject_Malloc [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    5,006,318  ???:0x00000000004bdc60'2 [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    4,842,496  ???:PyDict_SetItem [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    4,519,155  ???:PyDict_Next [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    3,835,459  ???:PyObject_Free [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    3,270,809  ???:PyObject_Hash [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    3,257,249  ???:PyNode_AddChild [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]

Xenial nopgo:
=============
Profiled target:  /home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python /home/ubuntu/venv/cpython2.7-abc0c129a9a8/li
b/python2.7/site-packages/performance/benchmarks/bm_call_method.py --worker --pipe 4 --worker-task=0 --samples 3 --
warmups 1 --loops 1 --min-time 0.1 (PID 31025, part 1)
5,293,380,790  ???:PyEval_EvalFrameEx'2 [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
1,058,376,436  ???:0x00000000004d9030 [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  850,012,013  ???:PyFrame_New [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  823,053,388  ???:_PyObject_GenericGetAttrWithDict [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  525,847,184  ???:PyMethod_New [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  471,794,110  ???:0x00000000004e1030 [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  461,203,154  ???:_PyType_Lookup [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  312,611,394  ???:PyObject_GetAttr [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
  148,905,242  ???:PyObject_GC_UnTrack [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
   40,444,971  ???:0x00000000004e09c0 [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
   12,120,701  ???:PyDict_GetItem [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
   10,987,593  ???:PyParser_AddToken [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    6,569,654  ???:PyObject_Malloc [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    5,006,318  ???:0x00000000004bdc60'2 [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    4,842,666  ???:PyDict_SetItem [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    4,519,155  ???:PyDict_Next [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    3,835,456  ???:PyObject_Free [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    3,270,809  ???:PyObject_Hash [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]
    3,257,249  ???:PyNode_AddChild [/home/ubuntu/venv/cpython2.7-abc0c129a9a8/bin/python2]

Xenial nolto
============
4,638,372,768  ???:PyEval_EvalFrameEx'2 [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
1,032,105,069  ???:0x00000000004baed0 [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
  930,988,654  ???:_PyObject_GenericGetAttrWithDict [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
  836,521,421  ???:PyFrame_New [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
  539,330,714  ???:PyMethod_New [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
  471,820,360  ???:0x00000000004ab110 [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
  459,027,697  ???:_PyType_Lookup [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
  231,463,205  ???:PyObject_GetAttr [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
  148,905,033  ???:PyObject_GC_UnTrack [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
   40,447,959  ???:0x00000000004bb9c0 [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
   26,987,922  ???:PyObject_GenericGetAttr [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
   10,987,547  ???:PyParser_AddToken [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
   10,817,485  ???:0x00000000004d5100 [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
    6,371,045  ???:PyDict_GetItem [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
    4,810,558  ???:0x0000000000531b20'2 [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
    4,434,281  ???:0x00000000004f4f70 [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
    4,103,768  ???:PyObject_Free [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
    3,779,149  ???:0x00000000004d66a0 [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
    3,406,572  ???:PyDict_SetItem [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
    3,363,736  ???:0x0000000000596340 [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
    3,257,249  ???:PyNode_AddChild [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]
    3,245,139  ???:PyObject_Malloc [/home/ubuntu/venv/cpython2.7-67a0e317201d/bin/python2]

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to python2.7 in Ubuntu.
https://bugs.launchpad.net/bugs/1638695

Title:
  Python 2.7.12 performance regression

Status in python2.7 package in Ubuntu:
  Confirmed

Bug description:
  I work on the OpenStack-Ansible project and we've noticed that testing
  jobs on 16.04 take quite a bit longer to complete than on 14.04.  They
  complete within an hour on 14.04 but they normally take 90 minutes or
  more on 16.04.  We use the same version of Ansible with both versions
  of Ubuntu.

  After more digging, I tested python performance (using the
  'performance' module) on 14.04 (2.7.6) and on 16.04 (2.7.12).  There
  is a significant performance difference between each version of
  python.  That is detailed in a spreadsheet[0].

  I began using perf to dig into the differences when running the python
  performance module and when using Ansible playbooks.  CPU migrations
  (as measured by perf) are doubled in Ubuntu 16.04 when running the
  same python workloads.

  I tried changing some of the kerne.sched sysctl configurables but they
  had very little effect on the results.

  I compiled python 2.7.12 from source on 14.04 and found the
  performance to be unchanged there.  I'm not entirely sure where the
  problem might be now.

  We also have a bug open in OpenStack-Ansible[1] that provides
  additional detail. Thanks in advance for any help you can provide!

  [0] https://docs.google.com/spreadsheets/d/18MmptS_DAd1YP3OhHWQqLYVA9spC3xLt4PS3STI6tds/edit?usp=sharing
  [1] https://bugs.launchpad.net/openstack-ansible/+bug/1637494

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/python2.7/+bug/1638695/+subscriptions

More information about the foundations-bugs mailing list