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- Newsgroups: comp.sys.atari.st
- Path: sparky!uunet!Cadence.COM!keiths
- From: keiths@Cadence.COM (Keith Sabine)
- Subject: Re: Falcon with 68882.
- Message-ID: <1992Dec22.163540.12372@Cadence.COM>
- Sender: Keith Sabine
- Organization: Cadence Design Systems, Inc.
- References: <1992Nov24.145139.28075@gserv1.dl.ac.uk> <1992Nov24.184524.3830@newshost.lanl.gov> <1f09bnINNkbo@rs1.rrz.Uni-Koeln.DE>
- Date: Tue, 22 Dec 1992 16:35:40 GMT
- Lines: 38
-
- In article <1f09bnINNkbo@rs1.rrz.Uni-Koeln.DE> kim@vax.mpiz-koeln.mpg.dbp.de writes:
- >In <1992Nov24.184524.3830@newshost.lanl.gov> hutch@bellman.lanl.gov (John Hutchinson) writes:
- >
- >>The addition of an FPU such as the 68882 does not speed up a machine. It
- >>only helps crunch floating point math operations _if_ the software is
- >>written so as to address an FPU if one exists.
- >
- >True, the mere addition of an FPU doesn't speed up anything, the
- >FPU has to be used by the software, otherwise it's utterly
- >useless. But if the software using the FPU ist the OS itself, the
- >addition of an FPU can very well lead to a general speedup.
-
-
- A FPU like the 68881/68882 does what the name says, i.e. floating
- point (number crunching to you) calculations. Now what does an OS
- do? It manages directories, files etc, all pretty mundane stuff,
- and all character or integer - based. So if the OS doesn't do
- floating point calculations (and lots of them) them you won't get
- any speed up.
-
- So what sort of things would benefit from a FPU? Well, 3D graphics
- (where you need to calculate trig functions which are a LOT faster
- with the FPU), CAD packages and the like. Unless you are interested
- in these sort of things (I am), then a 68881/2 is a waste of money.
-
- Keith.
-
-
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