3d-bench

[jfox@xxxxxxxxxx (Jeff Fox)]

Dear MISC readers,

Dave wrote:

>Keep in mind that this benchmark also is comparing P21Forth (few CODE words)
>with LMI UR/Forth (highly optimized).
>
>P21 is generating video, and running from DRAM.  With no video and running
>from SRAM, P21 should go 3 times faster.  But, I haven't measured that
>configuration.
>
>CPU        Seconds
>P21/SRAM   10  *estimated*
>486DX40    19
>P21/DRAM   30
>386DX20    35
>
>Given the efficiency differences between P21Forth and LMI UR/Forth, it looks
>to me like P21 *with video* is about 486DX40 class.

Having writen P21Forth I can say it generates code about an order of
magnitude slower than what an optimizing compiler could generate.  I
have no exerience with LMI UR/FORTH but I know it is a much more highly
optimized implementation than P21Forth.  So should include a factor
for this.  I would say it is a bigger factor on this example than you
indicate.

F21 will have a much faster clock and a faster memory interface than
P21.  It will also be easier to generate more highly optimized code
on F21.

In a multi-processor most nodes are just doing computation, not generating
video or other high memory bandwidth activities.  On your app if you
combine the faster clock and more optimization and *no video* and 
faster sram in F21 you might see:

 F21node     1 (estimated)

I do thank you ( Dave ) for having posted some of the details of this MISC
benchmark.

Jeff Fox