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From: jesup@cbmvax.commodore.com (Randell Jesup)
Newsgroups: comp.unix.amiga
Subject: Re: Amiga 3000UX, X, OpenLook, Motif, Color, A2410, Etc. (somewhat long)
Keywords: Amiga 3000UX, X, OpenLook, Motif, Color, A2410, etc.
Message-ID: <19926@cbmvax.commodore.com>
Date: 16 Mar 91 04:22:15 GMT
References: <392@tcr.UUCP> <19887@cbmvax.commodore.com>
Reply-To: jesup@cbmvax.commodore.com (Randell Jesup)
Organization: Commodore, West Chester, PA
Lines: 36

In article <19887@cbmvax.commodore.com> daveh@cbmvax.commodore.com (Dave Haynie) writes:
>In article <392@tcr.UUCP> xenon@tcr.UUCP (Chris Hanson) writes:
>
>>    7) I have also run a rough benchmarking program (that supposably computed
>>drystones per second) on the 3000UX/25, an 030 NeXT, and a DTK 80386/25
>>running ESIX SysV R3.2.2. The NeXT averaged about 9000, the 386 about 12000,
>>and the 3000 got about 3200. For comparison, the 3200 reading was from code
>>compiled with the AT&T cc compiler. Compiling the same source with the GNU
>>gcc compiler netted us a figure of over 6500. 

	The AT&T cc in SysVr4 has no optimization stage, I believe.  GCC is
far preferable currently.  Also, things like inlining string routines can
make a major difference in dhrystone (1000's), registerized parameters, 16
bit ints, etc.

>>The 68030's internal cache is too small to be of much use in Unix, 
>
>Actually, it helps out quite a bit, believe it or not.  The internal cache
>isn't large, but it is efficient.  Since the 68030 has separate internal data 
>and instruction paths, when both caches hit, you wind up doing fetches in
>parallel where the pipeline permits.

>This sized cache isn't going to hold entire programs, but it's not bad on
>program inner loops, or function calls (if you UNIX folks still push stuff
>on the stack, call a function, and then pop it off).

	Turning off the caches on my 3000 causes a particular make
(entirely from ram:, compiler resident, etc) to go from 170 seconds to
250.  It helps.

-- 
Randell Jesup, Keeper of AmigaDos, Commodore Engineering.
{uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.commodore.com  BIX: rjesup  
The compiler runs
Like a swift-flowing river
I wait in silence.  (From "The Zen of Programming")  ;-)