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
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