[Simh] VAX Emulation Speed Ramblings...

[Robert Lawrence]

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