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Created on 2008-02-29 01:59 by kwatch, last changed 2022-04-11 14:56 by admin. This issue is now closed.
| Files | ||||
|---|---|---|---|---|
| File name | Uploaded | Description | Edit | |
| posixmodule.patch | kwatch, 2008-02-29 02:08 | patch to Modules/posixmodule.c | ||
| Messages (4) | |||
|---|---|---|---|
| msg63116 - (view) | Author: Facundo Batista (facundobatista) *  |
Date: 2008-02-29 02:03 | |
What? Why you say that? What are you doing? What do you get? What do you expect? In which version of Python and in which Platform are you working? |
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| msg63117 - (view) | Author: makoto kuwata (kwatch) | Date: 2008-02-29 02:08 | |
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
|
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| msg63118 - (view) | Author: makoto kuwata (kwatch) | Date: 2008-02-29 02:16 | |
See http://groups.google.com/group/comp.lang.python/browse_thread/thread/8032897a30781df/c656a79d4c3268a6 for details about this bug. |
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| msg63137 - (view) | Author: Georg Brandl (georg.brandl) * |
Date: 2008-02-29 14:09 | |
Isn't that tracked in #1040026? |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:56:31 | admin | set | github: 46458 |
| 2008-02-29 14:09:42 | georg.brandl | set | nosy:
+ georg.brandl messages: + msg63137 |
| 2008-02-29 02:16:09 | kwatch | set | messages: + msg63118 |
| 2008-02-29 02:08:38 | kwatch | set | files:
+ posixmodule.patch keywords: + patch messages: + msg63117 title: os.times() returns uncorrect value -> os.times() returns incorrect value |
| 2008-02-29 02:03:04 | facundobatista | set | status: open -> closed resolution: rejected messages: + msg63116 nosy: + facundobatista |
| 2008-02-29 01:59:20 | kwatch | create | |