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- Newsgroups: comp.programming
- Path: sparky!uunet!newsgate.watson.ibm.com!yktnews!admin!flu!lowry
- From: lowry@watson.ibm.com (Andy Lowry)
- Subject: Does "400% faster" make sense? (Was: Re: finding 1st one in integer)
- Sender: news@watson.ibm.com (NNTP News Poster)
- Message-ID: <LOWRY.92Jul22154231@rotor.watson.ibm.com>
- In-Reply-To: berlin@is.morgan.com's message of Wed, 22 Jul 1992 16:07:35 GMT
- Date: Wed, 22 Jul 1992 20:42:31 GMT
- Disclaimer: This posting represents the poster's views, not necessarily those of IBM
- References: <1992Jul22.120735@is.morgan.com>
- Nntp-Posting-Host: rotor.watson.ibm.com
- Organization: IBM T.J. Watson Research Center
- Lines: 40
-
- In article <1992Jul22.120735@is.morgan.com> berlin@is.morgan.com (Alexander Berlin) writes:
- > Just a side note: it's impossible to have code that runs 400% faster. Twice
- > as fast means 50% faster. 100% faster means in NO TIME.
- > 400% slower makes sense, 400% faster doesn't.
- > 4 times faster means 75% faster.
-
- Hmm... did somebody issue an edict on this of which I wasn't aware (or
- was this the edict itself :-)? I know these are confusing terms that
- are vague because they are used differently by different people, but I
- can make a perfectly good case for saying that "400% faster" should
- mean "at 400% the speed," i.e. "at four times the speed." Or maybe
- I'd prefer to say that "400% faster" means "at a speed that is 400%
- greater" which means "at five times the speed." This is also in line
- with what I would expect a "400% speedup" to mean. I certainly would
- think it confusing if making something 75% faster were to result in a
- 300% speedup!
-
- Your rule appears to be that if measured time is cut to x% of the
- original, then you call it "(100-x)% faster" if x < 100 and (I'm
- guessing) "x% slower" if x > 100. But "fast" is a word that I
- associate with speed, not time, so even if the world were to vote on
- what these phrases were supposed to mean, I don't think I'd vote for
- your definitions!
-
- And if the world doesn't vote and start using consistent definitions,
- then your side note is pretty much without value (or perhaps of
- negative value because of its misleading statements), since it doesn't
- help me one iota in reading literature that makes use of such phrases.
- I still have to rely on either a precise definition made up front by
- the author, or on being able to deduce the intended meaning from
- context, because I certainly can't assume that the author is following
- your conventions!
-
- It's much better to point out the inherent vagueness in these terms as
- they are used in practice, and encourage people to include precise
- definitions when needed, than to claim that there's some universally
- accepted precise definition when there isn't.
- --
- Andy Lowry, lowry@watson.ibm.com, (914) 784-7925
- IBM Research, P.O. Box 704, Yorktown Heights, NY 10598
-