I think that's also the reason that speed (performance) is usually measured compared to something else, in our case CPython, which would get index of 100. If this is the index of average script execution time, PyPy index is then 80 to 200, and lower is better.
Regards, Gasper Zejn On Tuesday 21 April 2009 17:34:17 Laura Creighton wrote: > It is also hard for people to process fractional numbers when they are > thinking about speed. '2 times the speed' feels a lot easier to > understand than '2.1' times the speed. And once you get to numbers > less than 1, things break down altogether. If you want to tell me > that something is slower, I don't expect to hear it as 'some number > less than 1' times the speed. I want a very hard break at the point > 0, and for you then to go about telling me how many times slower than > something that something else is. > > For most measurements, I would be happy if nobody mentioned the words > 'speed', 'faster' and 'slower' at all. What I am _really_ interested, > is a measurement of time. And I have a much easier time understanding > time quantities, which I am used to dealing with, than speed quantites > which rarely show up in life. > > So while I am always a bit hazy on what 'x times the speed' really means, > when you change this to 'this program runs in half the time, one > quarter of the time, twice the time, or even .8 of the time' I have a > much easier time of it. I'm used to measuring time, and I expect it to > be linear. I'm not used to measuring speed, and I keep worrying > 'is this linear'? 'is this logarithmic?' 'is this exponential?'. It > is only when I get to measure the actual times taken to do some sort > of task, say a benchmark, that I get any real sense of whether a change > seems to be a trivial small improvement, or a colossal major one. > > I wonder if others feel the same way. > > Laura > _______________________________________________ > [email protected] > http://codespeak.net/mailman/listinfo/pypy-dev _______________________________________________ [email protected] http://codespeak.net/mailman/listinfo/pypy-dev
