[issue17667] Windows: build with "build_pgo.bat -2" fails to optimize python.dll

[Steve Dower]

Change by Steve Dower :


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resolution:  -> out of date
stage: patch review -> resolved
status: open -> closed

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[issue17667] Windows: build with "build_pgo.bat -2" fails to optimize python.dll

[Zachary Ware]

Change by Zachary Ware :


Removed file: https://bugs.python.org/file48296/27409.pdf

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[issue17667] Windows: build with "build_pgo.bat -2" fails to optimize python.dll

[Martha Simons]

Change by Martha Simons :


Added file: https://bugs.python.org/file48296/27409.pdf

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[issue17667] Windows: build with "build_pgo.bat -2" fails to optimize python.dll

[Mark Lawrence]

Change by Mark Lawrence :


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nosy:  -BreamoreBoy

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[issue17667] Windows: build with build_pgo.bat -2 fails to optimize python.dll

[Anselm Kruis]

Anselm Kruis added the comment:

It's indeed a very low priority issue.

You mention VS2008 and VS2010 PGO compiler bugs. I'm aware of the VS 2010 bugs, 
but I didn't observe any VS 2008 PGO bug with Python 2.7. Are you aware of any 
publicly available bug reports?

About the black/white list. I started with a black list, but then I switched to 
a white list for the following reason: the goal of running the test suite is to 
generate a reasonable profile. It is not a goal to test anything. Therefore 
both white list and black listing is possible.
I consider it more likely that a newly added test breaks the PGO build than 
that an existing test will be modified in a breaking way. Therefore I consider 
the while list superior for this particular application.

But as you already stated, it is low prio.

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[issue17667] Windows: build with build_pgo.bat -2 fails to optimize python.dll

[Zachary Ware]

Zachary Ware added the comment:

I think I'd rather see a blacklist than a whitelist; it should be much shorter 
and can be passed to regrtest with the -x option within build_pgo.bat.

Since we officially discourage PGO with VS 2008 and 2010 (due to compiler bugs) 
anyway, marking this as low priority.

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nosy: +zach.ware
priority: normal - low

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[issue17667] Windows: build with build_pgo.bat -2 fails to optimize python.dll

[Mark Lawrence]

Mark Lawrence added the comment:

See also #21907.

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nosy: +BreamoreBoy

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[issue17667] Windows: build with build_pgo.bat -2 fails to optimize python.dll

[Brian Curtin]

Changes by Brian Curtin br...@python.org:


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nosy:  -brian.curtin

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[issue17667] Windows: build with build_pgo.bat -2 fails to optimize python.dll

[Terry J. Reedy]

Changes by Terry J. Reedy tjre...@udel.edu:


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nosy: +brian.curtin, tim.golden
stage:  - patch review

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[issue17667] Windows: build with build_pgo.bat -2 fails to optimize python.dll

[Antoine Pitrou]

Changes by Antoine Pitrou pit...@free.fr:


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nosy: +loewis

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[issue17667] Windows: build with build_pgo.bat -2 fails to optimize python.dll

[Anselm Kruis]

New submission from Anselm Kruis:

Version: 2.7.4 (and any prior 2.7-version. not tested with 3.x)
Compiler: VS 2008 Professional

If I compile Python using the batch 

 PCbuild\build_pgo.bat -2

Visual Studio fails to correctly collect profile information for the project 
python27.dll. As a result, no real optimisation takes place.

The command build_pgo.bat -2 runs the full test suite 
(..\lib\test\regrtest.py) to collect profile data. Experiments show, that 
several test cases (i.e. test_os and test_subprocess) break the collection of 
profile data. Probably the failure is related to the creation of sub-processes. 
I consider it a Visual Studio bug.

To work around this issue I created a list of good test cases and patched 
build_pgo.bat to run only the tests from this list.

--
components: Build, Windows
files: build_pgo-2.patch
keywords: patch
messages: 186322
nosy: akruis
priority: normal
severity: normal
status: open
title: Windows: build with build_pgo.bat -2 fails to optimize python.dll
type: compile error
versions: Python 2.7
Added file: http://bugs.python.org/file29739/build_pgo-2.patch

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