result of os.times() is different with 'time' command

[aspineux]

I dont see anything wrong !
Did you try to measure time with your watch ?
Did you try a simple python test.py without the time command ?
Maybe python is 'disturbed' by the intel core

Here my result on a linux dual AMD, python 2.4.3

# time python test.py
n=35, v=14930352
utime=22.54, stime=0.02

real    0m22.755s
user    0m22.564s
sys     0m0.022s

can you try this ?

# strace python test.py  2>&1 | grep time
times({tms_utime=1, tms_stime=1, tms_cutime=0, tms_cstime=0}) =
430217777
times({tms_utime=2238, tms_stime=2, tms_cutime=0, tms_cstime=0}) =
430220049
write(1, "n=35, v=14930352\nutime=22.37, st"..., 41n=35, v=14930352
utime=22.37, stime=0.01

now you can compare what your system replied and what python
returned !


On 2 fév, 19:30, kwa... at gmail.com wrote:
> Hi,
>
> I have a question about os.times().
> os.times() returns a tuple containing user time and system time,
> but it is not matched to the result of 'time' command.
> For example, os.times() reports that user time is 39.85 sec,
> but 'time' command reports that user time is 28.55sec.
> (machine: Python2.5, MacOS X 10.4 Tiger, MacBook 1.83GHz intel core
> duo)
>
>   file: ostimetest.py
>   --------------------
>   import os
>
>   ## benchmark function
>   def f(x):
>       if x <= 1:
>           return 1
>       else:
>           return f(x-1) + f(x-2)
>
>   ## do benchmark
>   n = 35
>   t1 = os.times()         # start time
>   v = f(n)                # end time
>   print "n=%d, v=%d" % (n, v)
>   t2 = os.times()
>
>   ## print result
>   utime = t2[0] - t1[0]   # user time
>   stime = t2[1] - t1[1]   # system time
>   print "utime=%s, stime=%s" % (utime, stime)
>   --------------------
>
>   Result:
>   ====================
>   $ python -V
>   Python 2.5
>   $ time python ostimetest.py
>   n=35, v=14930352
>   utime=39.85, stime=0.216666666667
>   real    0m28.554suser    0m23.938ssys     0m0.177s
>   ====================
>
> This shows that os.times() reports that user time is 39.85sec,
> but time command shows that user time is 23.938sec.
> Why os.times() reports wrong result? Do I have any mistake?
>
> --
> kwatch