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From: kls30@duts.ccc.amdahl.com (Kent L Shephard)
Newsgroups: comp.sys.mac.misc,comp.windows.ms
Subject: Re: Mac Vs. Windows? (sorry)
Message-ID: <56nD02AQ08cd01@JUTS.ccc.amdahl.com>
Date: 11 Jun 91 14:57:22 GMT
References: <0E010021.e0mxxc@gla-aux.uucp> <1991Jun4.154854.19649@dbase.A-T.COM>
Sender: netnews@ccc.amdahl.com
Reply-To: kls30@DUTS.ccc.amdahl.com (Kent L. Shephard)
Organization: Amdahl Corporation, Sunnyvale CA
Lines: 40

In article <1991Jun4.154854.19649@dbase.A-T.COM> tomr@dbase.UUCP (Tom Rombouts) writes:
>In article <0E010021.e0mxxc@gla-aux.uucp> glenn%gla-aux.uucp@skinner.cs.uoregon.edu writes:
>>
>>In article <1991May18.050842.5732@cs.uoregon.edu>, akm@obelix.cs.uoregon.edu (Anant Kartik Mithal) writes:
>>> So, my question is: if the Mac is faster than a "comparable" pc in
>>> execution, what is the reason? Is it ROM? (I don't think so for the
>>> reasons listed above.) What other things can make a difference?
>>
>>Two things -- processor effeciency and levels of routines.
>
>[ rest of post deleted ]
>
>>2) The Motorola (and for that matter, any linear-addressing processor) is
>>faster than segmented memory.

Excuse me but this is not the case.  If you have an OS like Unix, System 7
or any OS that provide virtual memory you are back to -(drum roll please)
a segmented OS.  Pages are just large segments.

But honestly it depends entirely on how efficient the architecture to
to begin with.  An efficiently designed segmented arch. can be faster than
a non-segmented one.  Also the entire system will design will effect
performance.

>Correct me if I am wrong, but in small (or tiny) memory model apps,
>the 80x86 is essentially a linear-addressing processor.  I would tend
>to think it would be faster shuffling 16-bit addresses (since the
>segment registers do not change) than a Motorola with (is it?) 32-bit
>addresses.
>
>Of course, this is straying from discussion of Win3....
>
>Tom Rombouts  Torrance 'Tater  tomr@ashtate.A-T.com


--
/*  -The opinions expressed are my own, not my employers.    */
/*      For I can only express my own opinions.              */
/*                                                           */
/*   Kent L. Shephard  : email - kls30@DUTS.ccc.amdahl.com   */