[TUHS] Lorinda Cherry

Tom Ivar Helbekkmo tih at hamartun.priv.no
Fri Feb 18 05:59:46 AEST 2022

Leah Neukirchen <leah at vuxu.org> writes:

> Apparently it was a popular benchmark back in the day:
> https://www.tuhs.org/Archive/Documentation/AUUGN/AUUGN-V05.1.pdf
>> [...]
>> By comparison, a VAX 11/780 clocks about 5 to 6 secs, VAX750 9 sec, PDPIIs
>> range from 27 secs (11/23) to 6 secs (11/70), PDP ii/34s range from 12 to 19
>> secs depending upon the presence of a cache. Perkin-Elmer range from 12o5
>> secs (32/10) to 7°9 secs (32/40)o

Well, I just had to run it on some older hardware...

12MHz 80286 running MINIX 1.6.25 and the classic C version of dc:
real        4.00
user        3.56
sys         0.25

DEC MicroPDP-11/23 running PWB UNIX 1.0 and the assembly coded dc:
real       29.0
user       22.2
sys         0.7

Watching the prime number generator (from the Wikipedia page on dc)
running on the 11/23 is much more entertaining than doing it on the
modern workstation I'm typing this on:


Incidentally, the Wikipedia page only lists Robert Morris as author of
dc.  If anyone here is able to edit Wikipedia, now would be a good time
to get Lorinda Cherry's name on there, too.

Most people who graduate with CS degrees don't understand the significance
of Lisp.  Lisp is the most important idea in computer science.  --Alan Kay

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