Thank you Patrick for that sufficient reply. I discussed this with my
colleagues, and it seems that Sys_Milliseconds() is enough for us to do our
measurements.
Regards,
Yasir
>________________________________
> From: Patrick Baggett <baggett.patr...@gmail.com>
>To: Yasir I. Al-Dosary - zgzg2020™ <yasiraldos...@yahoo.com>; Primary ioquake3
>Discussion/Development list <ioquake3@lists.ioquake.org>
>Sent: Friday, September 21, 2012 12:29 PM
>Subject: Re: [ioquake3] Why is processing time is measured by
>Sys_Milliseconds() is 0?
>
>
>It means that the granualarity of the clock is not sufficient to detect a
>change. Even though the unit of time returned in measured in milliseconds, it
>really is system dependent on what the granularity of the timer is. For
>example, a common Win32 API, GetTickCount(), returns time in units of
>milliseconds, but it can have a granularity of 10msec, meaning up to 10msec
>may have to pass before a new value is returned. Milliseconds on the other
>hand, are just units. It could be in microseconds, it wouldn't matter: if the
>clock changes every 10,000 microseconds, then you aren't any better off.
>
>
>IOQuake3 runs of a variety of platforms, and for their purposes, it was
>sufficient. If you're time a loop by repeating an operation (i.e.
>benchmarking), then maybe you can try increasing the number iterations?
>Otherwise, celebrate! The code is "fast enough"!
>
>
>But, if you really must have access to a higher resolution timer, you'll need
>to go OS-specific. If you're using a POSIX-like system, clock_gettime() may be
>able to help. On Windows, there is QueryPerformanceCounter().
>
>
>
>
>Patrick
>
>
>On Thu, Sep 20, 2012 at 10:03 PM, Yasir I. Al-Dosary - zgzg2020™
><yasiraldos...@yahoo.com> wrote:
>
>Hi,
>>I am trying to measure how much processing time certain functions take.
>>--------
>> StartTime = Sys_Milliseconds();
>> for(loops more than 20 times) {
>> FuncX(Var0);
>> }
>> EndTime = Sys_Milliseconds() - StartTime;
>>---------
>>EndTime gets a zero value many times.
>>How can this be correct?
>>Is there a higher precision time built-in function inside ioquake3?
>>
>>
>>Cheers
>>
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>>
>
>
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