home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.lang.lisp.mcl
- Path: sparky!uunet!stanford.edu!CSD-NewsHost.Stanford.EDU!Xenon.Stanford.EDU!michaelg
- From: michaelg@Xenon.Stanford.EDU (Michael Greenwald)
- Subject: Re: Speed freak needs help
- Message-ID: <michaelg.725139641@Xenon.Stanford.EDU>
- Sender: news@CSD-NewsHost.Stanford.EDU
- Organization: CS Department, Stanford University, California, USA
- References: <9212231553.AA22788@cambridge.apple.com>
- Date: 23 Dec 92 19:40:41 GMT
- Lines: 24
-
- moon (David A. Moon) writes:
-
- > Symbolics still makes
- >Lisp machines, but again without having measured them I think you would find
- >performance on the latest Symbolics machine similar to or less than the
- >Quadra. (The Symbolics clock rate is half the Quadra clock rate, but the
- >architecture is not much more than twice as efficient.)
-
- I don't know the numbers, this is a non-rhetorical question: How does
- the Symbolics single float implementation stack up against the Quadra?
- (I'm assuming that the Quadra conses its floats, while the LispM uses
- immediates). If (and it's a big "if"), the application in question is
- float-intensive, and the GC is taking a significant part of the
- overhead, then perhaps the Symbolics machines (or any machine with
- immediate single floats) can give a reasonable performance boost.
-
- But for a factor of 10 or 20, the answer (if any) probably lies in:
-
- >Are you sure the algorithm can't be optimized? Sometimes that's the fastest
- >and cheapest way to get more speed. But maybe you already tried that.
-
-
-
-
-