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From: bill@hcx2.ssd.csd.harris.com (Bill Leonard)
Newsgroups: comp.benchmarks
Subject: Re: C Cost Model
Keywords: Elementary C Cost Model
Message-ID: <2340@travis.csd.harris.com>
Date: 12 Feb 91 22:31:36 GMT
References: <5778@beryl12.UUCP>
Sender: news@travis.csd.harris.com
Reply-To: bill@hcx2.ssd.csd.harris.com (Bill Leonard)
Distribution: comp
Organization: Harris Computer Systems Division, Fort Lauderdale, FL
Lines: 18

In article <5778@beryl12.UUCP>, mostek@motcid.UUCP (Frank B. Mostek) writes:
> There is an excellent article ... that supposedly will enable the reader
> to run an experiment on his/her machine which would estimate the cost of
> a given operation to within 25 percent.

I haven't read the article, but I wouldn't believe it if this is truly what
it says.  I know that, on our Motorola M88100-based machines, the cost of a
floating-point divide (for instance) can vary a lot more than 25%.  The
M88100 can overlap operations so that the divide can appear to be almost
entirely free, _if_ there is other work to do.  Other operations can vary
similarly.

-- 
Bill Leonard
Harris Computer Systems Division
2101 W. Cypress Creek Road
Fort Lauderdale, FL  33309
bill@ssd.csd.harris.com