On 2010-02-09, Jean-Michel Pichavant <jeanmic...@sequans.com> wrote:
> Grant Edwards wrote:
>> What's the correct way to measure small periods of elapsed
>> time. I've always used time.clock() in the past:
>>
>> start = time.clock()
>> [stuff being timed]
>> stop = time.clock()
>>
>> delta = stop-start
>>
>>
>> However on multi-processor machines that doesn't work.
>> Sometimes I get negative values for delta. According to
>> google, this is due to a bug in Windows that causes the value
>> of time.clock() to be different depending on which core in a
>> multi-core CPU you happen to be on. [insert appropriate
>> MS-bashing here]
>>
>> Is there another way to measure small periods of elapsed time
>> (say in the 1-10ms range)?
>>
>> Is there a way to lock the python process to a single core so
>> that time.clock() works right?
> Did you try with the datetime module ?
>
> import datetime
> t0 = datetime.datetime.now()
> t1 = t0 - datetime.datetime.now()
> t1.microseconds
> Out[4]: 644114
Doesn't work. datetime.datetime.now has granularity of
15-16ms.
Intervals much less that that often come back with a delta of
0. A delay of 20ms produces a delta of either 15-16ms or
31-32ms
--
Grant Edwards grante Yow! I'm receiving a coded
at message from EUBIE BLAKE!!
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