[Simh] VAX Emulation Speed Ramblings...
Robert Lawrence
rob at rjltech.com
Fri Aug 27 00:50:09 EDT 2004
Mark Pizzolato wrote:
>I've got a Pentium IV 2.8Ghz system purchased 18 months ago, on which
>a SIMH VAX does 14500 V1.1 dhrystones per second (VAX 780 was 1857).
>That is 7.8 VUPs by my calculation. What 1.2ghz system is producing
>5 VUPS?
>
>- Mark Pizzolato
>
>
>
I have an Athalon Thunderbird 1.2ghz for my dedicated simh machine.
This machine
runs OpenBSD 3.5 and a stock build of simh. Large RAM and large disk
support was enabled. No other changes to the source or makefile.
According to the Dhrystone 1.1 source code:
* VAX 11/780 - UNIX 4.3bsd cc 1646 1662
Runing UNIX 4.3bsd under simh/vax, I get 8920 dhrystones.
According to my handy calculator, 8920 / 1646 = 5.42
Using your rating for the 780, 8920 / 1857 = 4.80
So I am comfortable saying that it performs about 5 VUPs.
Robert
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