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From: steele@unc.cs.unc.edu (Oliver Steele)
Newsgroups: comp.sys.mac,comp.sys.mac.programmer
Subject: Re: Dhrystone 2
Message-ID: <1634@thorin.cs.unc.edu>
Date: 10 Mar 88 01:51:24 GMT
References: <3996@batcomputer.tn.cornell.edu>
Sender: news@thorin.cs.unc.edu
Reply-To: steele@unc.UUCP (Oliver Steele)
Organization: University Of North Carolina, Chapel Hill
Lines: 53

All right, I'll try this again.  Apologies if you see this twice; I
posted it before and it never showed up, so I'll try it again.  I
posted the below-the-= to a local group; additions are:

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.  I assumed
60Ticks/second; if there are instead n, multiply the below numbers by n/60
to get the Truth.  I tried these on Macs with nothing unusual on them
except FadeToBlack; I think this runs off of GetNextEvent() so it doesn't
eat any time.  I did the 32bit-int tests by changing ints to longs and
constants in arg lists to long constants; there were two of the latter.

======================================================================
To round things out, here are some more department dhries.  LSC is
Lightspeed C; MPW is Macintosh Programmer's Workshop C.  I didn't bother
much with the MacPlus -- it's too slow -- and I couldn't find an SE.  Yes,
fans, it sometimes is faster not to use register variables (probably on
procedure-call-intensive programs, which have to do too much pushing and
popping, but I didn't look at the output code); and -mc68020 really is
faster than -mc68020 -q.

16 or 32 indicates how many bits ints were.  Both compilers use 16-bit
ints by default, but this seemed to be comparing...

    Machine		      Dhrystones/sec
	Opt. level
			No Registers	Registers
    =================	============	=========

    Mac II
      LSC16		2698		2925
      LSC32		1910		1779
      MPW16
	no opt		2609		2608
	-q		2734		2768
	-mc68020	3043		3066
	-q -mc68020	2997		3005
      MPW32
	no opt		2586		2569
	-q		2690		2699
	-mc68020	2984		2976
	-q -mc68020	2921		2945


    MacPlus
      LSC16		785		715
      LSC32		489		525

----------------------------------------------------------------------------
Oliver Steele					   ...!uunet!mcnc!unc!steele
							   steele@cs.unc.edu
"A sea urchin is the best way to comb the inside
of a hairy tube."		-- Peter Wolfenden