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Version 1.1. Fix memory leak and expensive comparison with None.

This commit is contained in:
Guido van Rossum 1997-01-18 02:20:37 +00:00
parent 3e7ae7ab17
commit 04f2b453bb
2 changed files with 44 additions and 6 deletions
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25
Lib/test/pystone.py
View File

@ -3,7 +3,7 @@
"""
"PYSTONE" Benchmark Program
Version: Python/1.0 (corresponds to C/1.1)
Version: Python/1.1 (corresponds to C/1.1 plus 2 Pystone fixes)
Author: Reinhold P. Weicker, CACM Vol 27, No 10, 10/84 pg. 1013.
@ -12,13 +12,31 @@ Author: Reinhold P. Weicker, CACM Vol 27, No 10, 10/84 pg. 1013.
at the expense of C-ness.
Translated from C to Python by Guido van Rossum.
Version History:
Version 1.1 corrects two bugs in version 1.0:
First, it leaked memory: in Proc1(), NextRecord ends
up having a pointer to itself. I have corrected this
by zapping NextRecord.PtrComp at the end of Proc1().
Second, Proc3() used the operator != to compare a
record to None. This is rather inefficient and not
true to the intention of the original benchmark (where
a pointer comparison to None is intended; the !=
operator attempts to find a method __cmp__ to do value
comparison of the record). Version 1.1 runs 5-10
percent faster than version 1.0, so benchmark figures
of different versions can't be compared directly.
"""
LOOPS = 1000
from time import clock
__version__ = "1.0"
__version__ = "1.1"
[Ident1, Ident2, Ident3, Ident4, Ident5] = range(1, 6)
@ -121,6 +139,7 @@ def Proc1(PtrParIn):
NextRecord.IntComp = Proc7(NextRecord.IntComp, 10)
else:
PtrParIn = NextRecord.copy()
NextRecord.PtrComp = None
return PtrParIn
def Proc2(IntParIO):
@ -137,7 +156,7 @@ def Proc2(IntParIO):
def Proc3(PtrParOut):
global IntGlob
if PtrGlb != None:
if PtrGlb is not None:
PtrParOut = PtrGlb.PtrComp
else:
IntGlob = 100

25
Tools/scripts/pystone.py
View File

@ -3,7 +3,7 @@
"""
"PYSTONE" Benchmark Program
Version: Python/1.0 (corresponds to C/1.1)
Version: Python/1.1 (corresponds to C/1.1 plus 2 Pystone fixes)
Author: Reinhold P. Weicker, CACM Vol 27, No 10, 10/84 pg. 1013.
@ -12,13 +12,31 @@ Author: Reinhold P. Weicker, CACM Vol 27, No 10, 10/84 pg. 1013.
at the expense of C-ness.
Translated from C to Python by Guido van Rossum.
Version History:
Version 1.1 corrects two bugs in version 1.0:
First, it leaked memory: in Proc1(), NextRecord ends
up having a pointer to itself. I have corrected this
by zapping NextRecord.PtrComp at the end of Proc1().
Second, Proc3() used the operator != to compare a
record to None. This is rather inefficient and not
true to the intention of the original benchmark (where
a pointer comparison to None is intended; the !=
operator attempts to find a method __cmp__ to do value
comparison of the record). Version 1.1 runs 5-10
percent faster than version 1.0, so benchmark figures
of different versions can't be compared directly.
"""
LOOPS = 1000
from time import clock
__version__ = "1.0"
__version__ = "1.1"
[Ident1, Ident2, Ident3, Ident4, Ident5] = range(1, 6)
@ -121,6 +139,7 @@ def Proc1(PtrParIn):
NextRecord.IntComp = Proc7(NextRecord.IntComp, 10)
else:
PtrParIn = NextRecord.copy()
NextRecord.PtrComp = None
return PtrParIn
def Proc2(IntParIO):
@ -137,7 +156,7 @@ def Proc2(IntParIO):
def Proc3(PtrParOut):
global IntGlob
if PtrGlb != None:
if PtrGlb is not None:
PtrParOut = PtrGlb.PtrComp
else:
IntGlob = 100