makoto kuwata added the comment:
I'm sorry to put empty submit.
os.time() returns incorrect value.
test.py:
def f(n):
if n <= 0:
return 1
else:
return f(n-1) + f(n-2)
import os
t1 = os.times()
f(34)
t2 = os.times()
utime = t2[0] - t1[0]
stime = t2[1] - t1[1]
total = utime + stime
print "utime %.4f, stime %.4f, total %.4f" % (utime, stime, total)
result:
$ time python bench.py
utime 38.6333, stime 0.1000, total 38.7333
real 0m23.787s
user 0m23.211s
sys 0m0.138s
This shows that real time is only 23.8 seconds, but os.times()
reports that user time is over 38 seconds.
This is due to bug of Modules/posixmodule.c.
Environment: python 2.5.2, MacOS X 10.4 Tiger, GCC 4.0
----------
keywords: +patch
title: os.times() returns uncorrect value -> os.times() returns incorrect value
Added file: http://bugs.python.org/file9568/posixmodule.patch
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<http://bugs.python.org/issue2205>
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