On Fri, 9 Jun 2000, Stuart Hughes wrote:
> > Suppose I have this procedure :
> >
> > void do_it()
> > {
> > complex_calculation();
> > other_complex_calculation();
> > }
> >
> > and this highest priority rtl thread(ignore syntax errors):
> >
> > pthread_make_periodic(PERIOD);
> > while (1) {
> > do_it();
> > pthread_wait();
> > }
> >
> > (2) How to measure the worst-case execution time of do_it() ?
> > Can I just run it 100 times, do measurement, and pick the greatest
> > value ?
> >
>
> Set the period to be much longer than expected (so you won't lock-up).
> Take the time before and after do_it() and then calculate the worst
> case. This can then be output with printk (every once in a while). If
> you then run it, you can load the system and observe the results.
But if I port my application into another machine, then I must redo the
measurement.
> To know whether you got the absolute worst case is difficult, but you
> should get a close idea of it from this test.
Can I do statistic method to guess WCET (worst case execution time)
from , say, 1000 measurement ?
Adi Sudewa
Teknik Informatika
Institut Teknologi Bandung
Indonesia
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