Path: utzoo!attcan!uunet!mailrus!iuvax!news!mentor.cc.purdue.edu!mace.cc.purdue.edu!abe
From: abe@mace.cc.purdue.edu (Vic Abell)
Newsgroups: comp.unix.aix
Subject: Re: Rumour about IBM benchmarks
Message-ID: <5524@mace.cc.purdue.edu>
Date: 14 Sep 90 13:30:12 GMT
References: <1233@torsqnt.UUCP>
Reply-To: abe@mace.cc.purdue.edu (Vic Abell)
Organization: Purdue University
Lines: 26

In article <1233@torsqnt.UUCP> david@torsqnt.UUCP (David Haynes) writes:
>I have heard a rumour that the benchmark results that IBM posted for
>their RS6000 system were the results of hand-coded, hand-optimized
>assembler coding rather than the result of compiling C or FORTRAN
>code. Can anyone confirm or deny this? 

Before we purchased a RISC System/6000 model 520, I ran my own versions of
the Linpack and Dhrystone tests.  I used straight C and Fortran code and
the ``-O'' compiler option.  My results confirm the figures published by
IBM.  If anything, the IBM benchmark results are conservatively stated.

			IBM's rating	My results

	MFLOPS		7.4 		7.55	[1]

	MIPS		27.5		29.4	[2]

[1] My rating comes from the average of ten runs of the unmodified Linpack
    program, matrix order 100, leading array dimension 201.  There was no
    difference between single and double precision results.

[2] MIPS are derived by dividing the rating produced by version 1.1 of the
    Dhrystone test by 1,757.  I used the average of ten runs of the test,
    51,651.

What is the source of your rumor, Sequent Marketing?  :-)