[ECOS] Re: minimum execution time with ecos

[Grant Edwards <grante at visi dot com>]

On 2007-04-13, M Arshad Khan <marshadkhan@gmail.com> wrote:

> can any body tell me wht is the minimum time delay that we can
> achive with ecos.

If youw ant to actually put a thread to sleep, the minimum
delay is one clock tick.   Usually 1ms or 10ms.  If you want to
busy way, the minimum delay is platform-dependant -- usually
tens or hundreds of nanoseconds.

> i want to run a simulation on ecos that will run in less then
> a tick(10mSec), is it possible and want to find its exact
> execution time.. how to find that.

That's a completely different question.  The minimum delay has
nothing to do with the granularity with which you can measure
time.  There's a call you can make to return the
number of hardware timer counts since the last system timer tick.

See the kernel test tm_basic sources -- it does exactly what
you're trying to do.

-- 
Grant Edwards                   grante             Yow!  ... Um...Um...
                                  at               
                               visi.com            


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