On Wed, Apr 22, 2009 at 04:17, Steven H. Rogers <[email protected]> wrote: > No. 100% faster takes half the time. First, PyPy takes (up to) twice the time of CPython.
Second, If A is 100% _slower_ than B, I take twice as much as your time; but in that case, you can't infer that B takes 100% less time - percentage sentences are not reversible like that; it takes 50% less time than B, so I'd say it's 50% faster. Analogously (or for the same reason), if from an amount of 100 €, you subtract 50% and you add the 50% of the result, you get 50 + 25 = 75 €. At least, when you write "20 percent slower", you were referring to the 0.8x factor (but I still think you should have written "PyPy can be from 20% faster to 100% slower than CPython", to be absolutely clear. By linear scaling, I guess, 20% faster would mean "new runtime = 0.9 old runtime", but that doesn't make sense. > # Steve > > Paolo Giarrusso wrote: >> >> On Wed, Apr 22, 2009 at 03:51, Steven H. Rogers <[email protected]> >> wrote: >> >>> >>> I was able to parse the speed description, though I had to slow down to >>> be sure I was capturing the intended meaning. Perhaps "20 percent >>> slower to 100 percent faster" would work better. >>> >> >> Well, it's actually 20 percent faster to 100 percent slower. Also, >> 100% faster would mean doing anything in no time :-D. >> >> Regards >> > > -- Paolo Giarrusso _______________________________________________ [email protected] http://codespeak.net/mailman/listinfo/pypy-dev
