[Simh] VAX Emulation Speed Ramblings...

[Robert Lawrence]

According to 
http://www.comwaretech.com/products/legacy_solutions/microvax.shtml,
"The REVIVER-VAX performance scales linearly with the PC's CPU speed. 
For integer operations, REVIVER-VAX provides a performance of about one 
VAX Unit of Processing (VUP) per 100 MHz of CPU clock. Disk I/O is 5 to 
20 times faster than on the original VAX."

How are they doing this?  Are they using some sort of JIT?  I get about 
5 VUPs from a 1.2ghz using simh.  According to their calculations, 12 
VUPs should be possible.

What methods can be used to increase performance of simh/vax on any 
given pc?

Thanks,

Robert Lawrence