Date: Fri, 3 Apr 1998 12:17:19 GMT
From: pete@dunnington.u-net.com (Pete Turnbull)
Message-Id: <9804031317.ZM14102@indy.dunnington.york.ac.uk>
In-Reply-To: Greg Lehey <grog@lemis.com>
        "Re: Bug in Bob Supnik's Emulator!" (Apr  3, 17:26)
References: <199804030750.XAA10664@moe.2bsd.com> 
	<19980403172621.30485@papillon.lemis.com>
Reply-To: pete@dunnington.u-net.com
To: pups@minnie.cs.adfa.oz.au
Subject: Re: Bug in Bob Supnik's Emulator!
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On Apr 3, 17:26, Greg Lehey wrote:
> On 2 April 1998 at 23:50:23 -0800, Steven M. Schultz wrote:

> > 	Not having any great need of an emulated PDP-11 I've not pursued
> > 	the (suspected) bug in Bob Supnik's emulator.  Even on a PentiumPro
> > 	an emulated 11 is slower than a real 11/73 (and a lot slower than an
> > 	11/93 - which I should cease neglecting and stuff a SCSI card into
> > 	some day as I did with the 11/73).
>
> Interesting.  I was running this on an AMD K6/233, which should be
> slower than a PPro, and I had the impression it was faster.  Does
> anybody have some benchmarks?

I don't have numbers for anything running under the emulator, but I do have
Dhrystone sources (and some figures for real PDP-11s of various sorts with
various operating systems and compilers).  If anyone wants to try it, I can
post the source.

-- 

Pete						Peter Turnbull
						Dept. of Computer Science
						University of York