El Martes 07 Jul 2009 14:27:26 David Anderson escribió:
> The weighting is actually quadratic; i.e., when the job is half done
> the estimate is 75% from the dynamic and 25% from the static.
>
> However, I think I see a serious bug in the code (see below).
> Anyone else see it?
Last time I looked at this code, I thought something quite stupid was being
done. Then I analyzed it more carefully and it turned out to be right, just
written in a confusing way.
I'll try a "second pass".
> // Returns the estimated CPU time to completion (in seconds) of this task.
> // Compute this as a weighted average of estimates based on
> // 1) the workunit's flops count
> // 2) the current reported CPU time and fraction done
> //
> double ACTIVE_TASK::est_time_to_completion(bool for_work_fetch) {
> if (fraction_done >= 1) return 0;
> double wu_est = result->estimated_duration(for_work_fetch);
> if (fraction_done <= 0) return wu_est;
> double frac_est = (elapsed_time / fraction_done) - elapsed_time;
> double fraction_left = 1-fraction_done;
> double wu_weight = fraction_left * fraction_left;
> double fd_weight = 1 - wu_weight;
> double x = fd_weight*frac_est + wu_weight*fraction_left*wu_est;
> return x;
> }
>
> double RESULT::estimated_duration(bool) {
> return
> estimated_duration_uncorrected()*project->duration_correction_factor; }
>
> double RESULT::estimated_duration_uncorrected() {
> return wup->rsc_fpops_est/avp->flops;
> }
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