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From: chow@batcomputer.tn.cornell.edu (Christopher Chow)
Newsgroups: comp.sys.mac,comp.sys.mac.programmer
Subject: Re: Dhrystone 2 (Actually, LSC weirdness)
Message-ID: <4004@batcomputer.tn.cornell.edu>
Date: 10 Mar 88 16:11:02 GMT
References: <3996@batcomputer.tn.cornell.edu> <1634@thorin.cs.unc.edu>
Reply-To: chow@tcgould.tn.cornell.edu (Christopher Chow)
Organization: Cornell Theory Center, Cornell University, Ithaca NY
Lines: 41

In article <1634@thorin.cs.unc.edu> steele@unc.UUCP (Oliver Steele) writes:
|
|I hope my results differ from Mr. Chow's because he used the LSC time(),
|which grains to the second (minute?), while I used Ticks.  
|
|			No Registers	Registers
|    =================	============	=========
|
|    Mac II
|      LSC16		2698		2925

You may recall that when I did the Dhrystone 2.0 benchmark on my Mac II,
I reported a speed of 2469 Dhry/sec.  As it turned out, I didn't use the LSC
library function time(), but instead TickCount().

After a bit of experimenting, I found the following interesting fact:  When
I ran my benchmark, I did it on a 2Mb Mac II under MultiFinder. I had
VersaTerm resident to I could look up unix man pages, so I decided the have
LSC link an actual application for me since there wasn't enough memory left
to run Dhrystones under LSC/MultiFinder.  When I made my benchmark timming
of 2469, I did so under both Finder and Multifinder, so MultiFinder dosen't
seem to be the culprit.

This morning, I decided to run the Dhrystone program under LSC/Multifinder
(i.e, recompile and have LSC launch it into an Multifinder "partition").
Using this method, I got the 2698 Dhrystone/sec figure which Mr. Steele
obtained.  Unfortunately, for some reason, I still can't match the Mr.
Steel's registers benchmark...(mine was still 2698).

Does anyone know what's going on here?  Why am I getting an 9.3% increase in
execution speed when running under LSC/MF over the linked application
version?

Christopher Chow
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