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- Newsgroups: comp.sys.super
- Path: sparky!uunet!noc.near.net!meiko.com!richard
- From: richard@meiko.com (Richard Cownie)
- Subject: Re: World's Most Powerful Computing Sites
- Message-ID: <1993Jan21.165159.10149@meiko.com>
- Organization: Meiko Scientific Corp.
- References: <1993Jan20.232809.29241@nas.nasa.gov>
- Date: Thu, 21 Jan 1993 16:51:59 GMT
- Lines: 35
-
- fineberg@wilbur.nas.nasa.gov (Samuel A. Fineberg) writes:
- : In article <1993Jan20.211032.11929@hubcap.clemson.edu>, richard@meiko.com (Richard Cownie) writes:
- : |> This seems to imply a figure of over 4MFLOPS per T800. Last time
- : |> I programmed one, it was a real struggle to achieve over 1MFLOPS
- : |> even for inner loops of vector routines. Not that 4MFLOPS is
- : |> necessarily a lie, you might manage it if you're adding two 32-bit
- : |> zeros (and never storing the result). But it's certainly stretching
- : |> the truth a long way: there are lies, damned lies, and statistics.
- : |>
- : |> --
- : |> Richard Cownie (a.k.a. Tich), Meiko Scientific Corp
- : |> email: richard@meiko.com
- : |> phone: 617-890-7676
- : |> fax: 617-890-5042
- : |>
- : Its certainly no less realistic than those for the i860.
- :
- : Sam
-
- I have to disagree with you there. I know of *some* applications where
- the i860 can achieve a good fraction of claimed peak speed, e.g. on
- a double-precision matrix multiply you can do over 35MFLOPS, against
- a peak rate claimed as 40MFLOPS (or sometimes 60MFLOPS, because you can do
- 2 adds for each multiply). In any case, it's well over 50% of peak.
-
- If a T800 transputer can achieve 50% of 4.4MFLOPS on a matrix multiply,
- or indeed *anything* useful, I'd be interested to hear about it.
-
- Performance on big compiled Fortran programs is another kettle of fish,
- and here I'd agree that peak performance figures are not much help.
- --
- Richard Cownie (a.k.a. Tich), Meiko Scientific Corp
- email: richard@meiko.com
- phone: 617-890-7676
- fax: 617-890-5042
-