Author gz
Recipients Arach, Arfrever, Huzaifa.Sidhpurwala, Jim.Jewett, Mark.Shannon, PaulMcMillan, Zhiping.Deng, alex, barry, benjamin.peterson, christian.heimes, dmalcolm, eric.snow, fx5, georg.brandl, grahamd, gregory.p.smith, gvanrossum, gz, haypo, jcea, lemburg, loewis, mark.dickinson, merwok, neologix, pitrou, skorgu, skrah, terry.reedy, tim.peters, v+python, zbysz
Date 2012-01-30.23:41:43
SpamBayes Score 1.70903e-10
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Message-id <1327966904.94.0.273785927847.issue13703@psf.upfronthosting.co.za>
In-reply-to
Content
> Has anyone had a chance to try this patch on Windows?  Martin?  I'm
> hoping that it doesn't impose a startup cost in the default
> no-randomization cost, and that any startup cost in the -R case is
> acceptable.

Just tested as requested. Is the patch against 3.1 for a reason? Can't
really be compared to earlier results, but get enough weird outliers
that that may not be useful anyway. Also needed the following change:

-+        chunk = Py_MIN(size, INT_MAX);
++        chunk = size > INT_MAX ? INT_MAX : size;

Summary, looks like extra work in the default case is avoided and
isn't crippling otherwise, though there were a couple of very odd runs
not presented probably due to other disk access.

Vanilla:

>timeit PCbuild\python.exe -c "import sys;print(sys.version)"
3.1.4+ (default, Jan 30 2012, 22:38:52) [MSC v.1500 32 bit (Intel)]

Version Number:   Windows NT 5.1 (Build 2600)
Exit Time:        10:42 pm, Monday, January 30 2012
Elapsed Time:     0:00:00.218
Process Time:     0:00:00.187
System Calls:     3974
Context Switches: 574
Page Faults:      1696
Bytes Read:       480331
Bytes Written:    0
Bytes Other:      190860


Patched:

>timeit PCbuild\python.exe -c "import sys;print(sys.version)"
3.1.4+ (default, Jan 30 2012, 22:55:06) [MSC v.1500 32 bit (Intel)]

Version Number:   Windows NT 5.1 (Build 2600)
Exit Time:        10:55 pm, Monday, January 30 2012
Elapsed Time:     0:00:00.218
Process Time:     0:00:00.187
System Calls:     3560
Context Switches: 441
Page Faults:      1660
Bytes Read:       461956
Bytes Written:    0
Bytes Other:      24926


>timeit PCbuild\python.exe -Rc "import sys;print(sys.version)"
3.1.4+ (default, Jan 30 2012, 22:55:06) [MSC v.1500 32 bit (Intel)]

Version Number:   Windows NT 5.1 (Build 2600)
Exit Time:        11:05 pm, Monday, January 30 2012
Elapsed Time:     0:00:00.249
Process Time:     0:00:00.234
System Calls:     3959
Context Switches: 483
Page Faults:      1847
Bytes Read:       892464
Bytes Written:    0
Bytes Other:      27090
History
Date User Action Args
2012-01-30 23:41:45gzsetrecipients: + gz, lemburg, gvanrossum, tim.peters, loewis, barry, georg.brandl, terry.reedy, gregory.p.smith, jcea, mark.dickinson, pitrou, haypo, christian.heimes, benjamin.peterson, merwok, grahamd, Arfrever, v+python, alex, zbysz, skrah, dmalcolm, neologix, Arach, Mark.Shannon, eric.snow, Zhiping.Deng, Huzaifa.Sidhpurwala, Jim.Jewett, PaulMcMillan, fx5, skorgu
2012-01-30 23:41:44gzsetmessageid: <1327966904.94.0.273785927847.issue13703@psf.upfronthosting.co.za>
2012-01-30 23:41:44gzlinkissue13703 messages
2012-01-30 23:41:43gzcreate