Preostalo "preostalo vrijeme" procjene na Windowsu dovoljno je da se s vremena na vrijeme pokreće netko ludo, ali jeste li se ikad pitali kako Windows određuje ta vremena? Danas SuperUser Q & A post ima neke odgovore za čudno, ali ipak frustrirano pitanje čitatelja.
Današnja pitanja i odgovori nam se javljaju zahvaljujući SuperUseru - podjele Stack Exchange-a, zajednice-driven grupiranja Q & A web stranica.
Windows 8.1 prozor prijenosa prozor screenshot ljubaznošću im stvarno famecore.
Pitanje
SuperUser čitač 'im stvarno famecore' želi znati kako Windows određuje koliko vremena će trebati za izvođenje operacije s datotekom:
I wanted to know if there is an equation that Windows uses to determine how long it takes to perform an action with a file such as: deleting, copying, erasing, or installing.
Image
For example, when I delete a file and Windows says Time remaining: 18 seconds, how is it calculating this number, and what does it use to calculate it?
Koriste li sustav Windows posebnu jednadžbu za određivanje preostalog vremena za izvođenje operacije ili samo za procjenu najboljih pogodaka?
Odgovor
SuperUser suradnici Valmiky Arquissandas i Richard imaju odgovor za nas. Prvo, Valmiky Arquissandas:
Have you noticed that it usually does not give you any estimates during the first few seconds?
That is because during the first few seconds, it just does the operation it has to do. Then, after a short amount of time, it knows how much it has already copied/deleted/etc, and how long it took. That gives you the average speed of the operation.
Then, divide the remaining bytes by the speed, and you have the time it will take to complete the operation.
This is elementary school math. If you want to travel 360 km, and at the end of the first minute you have traveled 1 km, how long will it take you to reach your destination?
Well, the speed is 1 km/minute, so that is 60 km/hour. 360 km divided by 60 km/hour gives you an estimated time of 6 hours (or 360 km / 1 km/minute = 360 minutes = 6 hours). Since you have already traveled for one minute, then the estimated time left is 5 hours and 59 minutes.
Substitute travel with copy, km with bytes, and that answers your question.
Different systems have different ways of estimating time. You can take the last minute and the estimates may vary wildly. Or you can take the full time, and if the speed actually changes permanently, your estimates may be far removed from reality. What I described is the simplest method.
Slijedi odgovor Richarda:
If you are interested, this question tells you how Windows and OSX formats the time left into the progress bar once it has an idea how long it has remaining.
When shortening time expressions in progress dialogs, should they be rounded up or down?
Raymond Chen, a developer on the Windows team at Microsoft, confirms this algorithm (see Valmiky’s answer above) in a posting on his blog. He also explains why it can be wrong.
Why does the copy dialog give such horrible estimates?
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