3 ms·
well you can let 1000 of them run for a year and from the ratio of those that failed calculate (or rather guesstimate) for how many years can more than 500 be s
by yread 15y ago
well you can let 1000 of them run for a year and from the ratio of those that failed calculate (or rather guesstimate) for how many years can more than 500 be still running.
It's not perfect, but for a perfect solution you would need something like a time machine, I guess.
edit: this article linked from wiki has nice explanations
http://db.usenix.org/events/fast07/tech/schroeder/schroeder_html/index.html http://db.usenix.org/events/fast07/tech/schroeder/schroeder_...
- StrawberryFrog 15y agoSome failures are at a random distribution - running 1000 for a year will help you estimate that. But any moving part has a finite lifetime due to wear, and you want to know how long this is. Running lots of them for 1/1000 of the expected lifespan shouldn't produce any at all of this kind of failure.
- wmf 15y agoThe normal speed of the clock is very slow, so it should be easy to run it at an accelerated rate to test wear. (There are limits, though; apparently the Difference Engine jams frequently if you overclock it.)