[issue6695] PyXXX_ClearFreeList for dict, set, and list

[Matthias Troffaes]

Matthias Troffaes <matthias.troffaes at gmail.com> added the comment:

I'm also attaching a test script to check the effect of the two patches
on gc.collect(). If many objects are allocated, space savings appear to
be relevant.



Before applying the patch (debug build on linux 64 bit):

Memory used (begin): 121Mb

memtest 2000000 int
====================
Memory used (peak): 297Mb
Memory used (end): 122Mb
Unfreed memory: 1Mb

memtest 2000000 str
====================
Memory used (peak): 455Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 float
====================
Memory used (peak): 236Mb
Memory used (end): 127Mb
Unfreed memory: 6Mb

memtest 2000000 int
====================
Memory used (peak): 313Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 Test
====================
Memory used (peak): 372Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 Test2
====================
Memory used (peak): 361Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 _tuple
====================
Memory used (peak): 529Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 _set
====================
Memory used (peak): 846Mb
Memory used (end): 765Mb
Unfreed memory: 644Mb

memtest 2000000 _dict
====================
Memory used (peak): 1241Mb
Memory used (end): 1241Mb
Unfreed memory: 1120Mb

memtest 2000000 Test3
====================
Memory used (peak): 1241Mb
Memory used (end): 765Mb
Unfreed memory: 644Mb
[40720 refs]



After applying the patch (same build system):

Memory used (begin): 121Mb

memtest 2000000 int
====================
Memory used (peak): 298Mb
Memory used (end): 121Mb
Unfreed memory: 0Mb

memtest 2000000 str
====================
Memory used (peak): 455Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 float
====================
Memory used (peak): 236Mb
Memory used (end): 127Mb
Unfreed memory: 6Mb

memtest 2000000 int
====================
Memory used (peak): 312Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 Test
====================
Memory used (peak): 374Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 Test2
====================
Memory used (peak): 361Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 _tuple
====================
Memory used (peak): 528Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 _set
====================
Memory used (peak): 846Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 _dict
====================
Memory used (peak): 1240Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb

memtest 2000000 Test3
====================
Memory used (peak): 999Mb
Memory used (end): 123Mb
Unfreed memory: 2Mb
[40740 refs]

----------
Added file: http://bugs.python.org/file14710/py3k-freelist_test.py

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<http://bugs.python.org/issue6695>
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