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- A serious software developer with a finished product,
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-
- Please e-mail to speedscr@cftnet.com for additional
- details.
-
- From owner-paper Tue Jan 23 19:15:05 1996
- Return-Path: <owner-paper>
- Received: by ftp.ardi.com (Smail3.1.29.1 #3)
- id m0teujF-0007qKa; Tue, 23 Jan 96 19:14 MST
- Sender: owner-paper
- Received: from ardi.com by ftp.ardi.com
- (Smail3.1.29.1 #3) id m0teuiB-0007qGn; Tue, 23 Jan 96 19:13 MST
- Path: sloth.swcp.com!usenet
- From: Clifford T. Matthews <ctm@ardi.com>
- Newsgroups: comp.emulators.mac.executor
- Subject: Re: Speedometer Results Overrated?
- Date: 23 Jan 1996 18:54:02 -0700
- Organization: ARDI
- Lines: 71
- Message-ID: <uf91iy8iit.fsf@ftp.ardi.com>
- References: <4e1aoj$ji8@news.voicenet.com>
- NNTP-Posting-Host: ftp.ardi.com
- In-reply-to: chessman@voicenet.com's message of Tue, 23 Jan 96 00:43:48 GMT
- X-Newsreader: Gnus v5.0
- To: executor@ardi.com
- X-MailNews-Gateway: From newsgroup comp.emulators.mac.executor
- Sender: owner-paper@ardi.com
- Precedence: bulk
-
- >>>>> "Mike" == ChessMan <chessman@voicenet.com> writes:
- In article <4e1aoj$ji8@news.voicenet.com> chessman@voicenet.com (ChessMan) writes:
-
-
- Mike> Although Speedometer makes it look like that Executor is
- Mike> running at say -- 25 mhz 68040 speed on a 90 mhz pentium -
- Mike> other CPU intensive programs may not fare as well. I got
- Mike> MACCHESS 2.0 to run (quite well) on Executor and for the
- Mike> same settings and position, it took MACCHESS almost 3x as
- Mike> long on Executor to arrive at the same result - 124 seconds
- Mike> to 43 seconds for my Daystar accelerated 68040 40 mhz
- Mike> IIvx. Indicating a comparable speed of 14-15 mhz 68040.
- Mike> Still impressive for an emulation program, but not quite as
- Mike> impressive as some of the Speedometer results.
-
- You're right in that the Speedometer results will not always scale,
- although if you're seeing a 90 MHz Pentium performing at the speed of
- a 14-15 MHz 68040, there *may* be more to it than straight CPU
- emulation speed differences.
-
- The way Executor works (more information provided is provided in
- ftp://ftp.ardi.com/pub/SynPaper) is to translate commonly accessed
- blocks of m68k instructions into x86 instructions and then execute the
- x86 instructions. This has two side-effects, either of which may be
- skewing the results in this case.
-
- Because the original m68k and the x86 instructions have to be kept
- around, Executor uses more memory than a m68k based Mac uses, which
- means sometimes it has to page portions of memory out to disk in order
- to not run out of physical memory. If Executor is doing *any* paging
- while computing, it will slow things down dramatically. *If* you're
- running Executor without enough memory to do the computation without
- paging, then by trying on another machine with more memory you might
- get faster results.
-
- In addition, Executor has to be aware of self-modifying code. After
- all, if it memorizes that a particular set of m68k instructions map
- into a set of x86 instructions, if the original m68k instructions are
- changed then Executor needs to throw away the mapped instructions and
- do another recompile. I don't know how MACCHESS 2.0 works, but if it
- dynamically builds board evaluators and then jumps into them, then
- Executor's performance will suffer for that.
-
- Beyond those two limitations that are a direct result of the technique
- that Executor uses, there is also a potential performance hit
- associated with our particular implementation, in that in order to
- make Executor's synthetic CPU smaller there are some instructions and
- addressing modes that we never translate to native code, instead some
- m68k code is translated to an intermediate interpretive form which is
- what we use for m68k that isn't executed often enough to justify
- recompilation into native code.
-
- But in general we've found that the Speedometer numbers really are
- good predictors of how well Executor will do on integer compute
- intensive tests. We've tried various photoshop plug-ins and also had
- customers comment on the speed at which they've gotten various PCs to
- run applications like NIH-Image and Stella.
-
- Were Executor 2 not so far behind (due to general slippage, holiday
- slippage, and MACWORLD Expo slippage), then it would be fun to find
- out specifically what's going on with MACCHESS 2.0, but since Mat is
- already 75% done on VCPU -- our next generation of synthetic CPU --
- which is significantly faster yet, we'll probably wait to look at
- MACCHESS 2.0's performance under VCPU, rather than Syn68k.
-
- Thanks for the info. Where are those 200 MHz P6s when you need them?
-
- Mike> Mike B.
-
- --Cliff
- ctm@ardi.com
-
- From owner-paper Tue Jan 23 19:15:34 1996
- Return-Path: <owner-paper>
- Received: by ftp.ardi.com (Smail3.1.29.1 #3)
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- From: "Kenneth E. Long (Ken Long Jr.)" <klong@violin.aix.calpoly.edu>
- Newsgroups: comp.emulators.mac.executor
- Subject: Re: Floppy Disk Drive read/write problems
- Date: Sun, 21 Jan 1996 19:08:54 -0800
- Organization: Cal Poly, San Luis Obispo
- Lines: 28
- Message-ID: <Pine.A32.3.91.960121190654.43055A-100000@violin.aix.calpoly.edu>
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-
-
-
- On 21 Jan 1996, Kyle Silfer wrote:
-
- > I never used to have this problem with Executor, but now I get annoying
- > error messages of the Disk I/O error variety. This is true of 1.99q for
- > DOS, and at least one executable revision before it... I saved a copy of
- > the 1.99p7 executable and if I swap it in place of 1.99q the floppy
- > read/write works perfectly.
- >
- > The errors are pretty instantaneous... as soon as I try to copy, no matter
- > what disk I use. I'll be keeping my copy of 1.99p7 around until this bug
- > clears up.
- >
- > --Kyle
-
- I'm having a problem with Executor Dos 1.99q not reading or writing
- floppy disks at all. When I try to read a disk or format a blank one,
- the system just hangs with the drive light still lit. I think the disk
- may still be spinning, but nothing happens. Any ideas?
-
- >From the desk of:
- KK /// EEEEE NN\ NN Ken Long, Cal Poly SLO
- KK/// EE NN\\ NN Political Science
- Clinton/Gore KK\\\ EE~~ NN \\NN klong@oboe.aix.calpoly.edu
- Gone in Four! KK \\\ EEEEE NN \NN http://www.calpoly.edu/~klong
-
-
-
-