[Zope-dev] Re: hasattr implementation for Zope?

[Tres Seaver]

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Tim Peters wrote:
Vewy strange -- it looks as though OS-level caching matters here:

$ python
Python 2.4.1 (#2, Mar 30 2005, 21:51:10)
[GCC 3.3.5 (Debian 1:3.3.5-8ubuntu2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
$ python test_lookup.py
lookup1  0.91
lookup2  0.45
lookup3  0.4
$ python test_lookup.py
lookup1  0.67
lookup2  0.48
lookup3  0.41
$ python test_lookup.py
lookup1  0.57
lookup2  0.55
lookup3  0.5
$ python test_lookup.py
lookup1  0.45
lookup2  0.44
lookup3  0.4
$ python test_lookup.py
lookup1  0.45
lookup2  0.44
lookup3  0.41
$ python test_lookup.py
lookup1  0.45
lookup2  0.45
lookup3  0.4
\$ python test_lookup.py
lookup1  0.45
lookup2  0.44
lookup3  0.41
$ ~/projects/Zope-CVS/bin/python
Python 2.3.5 (#1, Apr 11 2005, 13:18:06)
[GCC 3.3.5 (Debian 1:3.3.5-8ubuntu2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
$ ~/projects/Zope-CVS/bin/python test_lookup.py
lookup1  1.24
lookup2  0.59
lookup3  0.48
$ ~/projects/Zope-CVS/bin/python test_lookup.py
lookup1  0.49
lookup2  0.51
lookup3  0.48
$ ~/projects/Zope-CVS/bin/python test_lookup.py
lookup1  0.49
lookup2  0.52
lookup3  0.47
$ ~/projects/Zope-CVS/bin/python test_lookup.py
lookup1  0.5
lookup2  0.51
lookup3  0.47
$ ~/projects/Zope-CVS/bin/python test_lookup.py
lookup1  0.5
lookup2  0.51
lookup3  0.47
$ ~/projects/Zope-CVS/bin/python test_lookup.py
lookup1  0.49
lookup2  0.51
lookup3  0.47

But then again, the same is true for pystones:

$ python ~/projects/Zope-CVS/lib/python2.3/test/pystone.py Pystone(1.1)
time for 50000 passes = 1.39
This machine benchmarks at 35971.2 pystones/second
$ python ~/projects/Zope-CVS/lib/python2.3/test/pystone.py
Pystone(1.1) time for 50000 passes = 1.15
This machine benchmarks at 43478.3 pystones/second
$ python ~/projects/Zope-CVS/lib/python2.3/test/pystone.py
Pystone(1.1) time for 50000 passes = 0.96
This machine benchmarks at 52083.3 pystones/second
$ python ~/projects/Zope-CVS/lib/python2.3/test/pystone.py
Pystone(1.1) time for 50000 passes = 0.98
This machine benchmarks at 51020.4 pystones/second
$ python ~/projects/Zope-CVS/lib/python2.3/test/pystone.py
Pystone(1.1) time for 50000 passes = 0.96
This machine benchmarks at 52083.3 pystones/second
$ python ~/projects/Zope-CVS/lib/python2.3/test/pystone.py
Pystone(1.1) time for 50000 passes = 0.96
This machine benchmarks at 52083.3 pystones/second


Tres.
- --
===================================================================
Tres Seaver                                   tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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