^3: Rc5

[Nikos Kokras]

Christos Ricudis wrote:

> Hello Georgatos!
>
> In ?LINUX-USERS.GR? Georgatos Photis wrote:
>
>  GP? LOIPON, gia na jekiname:
>  GP? Bazw 2 Ultrasparc 3000, 1 cyrix-166, kai 1 kakomoiriko Pentium.
>
> Xm egw exw 1 Ultrasparc 2, 1 kakomoiro pentium ki ena akomh pio kakomoiro 486.
> O client yposthrizei offline submissions? An nai, exw kai sto spiti merika
> kakomoira cyrix και pentiums akoma. Poy briskoume ton client?
>
>  GP? Osoi pistoi:
>
>  GP?                         linux-greek-users at argeas.argos.hol.gr
>

off-line submissions ypostirizei, an tre3eis to client gia prwti fora vgazei ena
poly wraio pinaka gia to configuration (akoma kai autodetect/optimize gia ka8e
CPU!)
Ta pswro-Penthiums min ta gelate toso, akolou8ei ena kommati apo ta FAQ's tou
RC5:

"Why are Intel and PowerPC computers so much faster than other platforms?

Integral to the mathematics of the RC5 algorithm is a ROTL function, or rotate
left. For whatever reason, the designers of both the x86 architecture and the
PowerPc architecture decided to implement this function as a single instruction.
Other CPUs, however, do not have this function and must emulate the operation by
(at the very least) two shifts and a logical or. This handicap is why non-Intel
and non-PowerPC computers run rc5 much slower than one might expect and is also
the main reason that the rc5 client is a poor benchmark to use in determining the
speed and performance of a particular CPU."

--
Nikos Kokras, Senior Medical Student
Aristotle University of Thessaloniki,Hellas
tel: +30-31-243677,+30-1-6516375
e-mail: nikos at biogate.com,kkrnls at med.auth.gr



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