On Sun, 18 Mar 2007 16:18:40 +0100
"Nicolas Boulay" <[EMAIL PROTECTED]> wrote:
> > Yes, but 4GHz is about the limit how fast chips with
> > 2x2cm can be clocked. And even that needs very carefull
> > design of the clock distribution and signal routing.
> > Keep in mind that 2cm is about the distance a signal
> > can travel within one clock cycle (depends a lot on
> > the actually used wire model). And then you still
> > need some safety margin to reliably operate the chip
> > under all specified conditions.
> >
>
> A pentium 4 use double frequency ALU (this permit to simulate 2 ALU).
> Pentium 4 at 3 Ghz exist sine more than 4 years. 3 Ghz cpu imply 6 Ghz
> ALU in the pentium 4.
Video decoding is hard to parallelize on general purpose
CPUs. Thus even if it has two ALUs, you will not be able
to use both to their full potential. Specialized video
decoding hardware is much better in that case.
Also keep in mind, that having two processors does not
mean you have doubled your processing power. How much
you get depends a lot on:
1) How well you can parellize the work tasks.
2) How much communication overhead you have.
3) How much locking you have between the two CPUs.
4) How much cache/memory contention you have due to two
CPUs work in parallel.
For more information on this, please read a book
on high performance and/or parallel computing.
Attila Kinali
--
Linux ist... wenn man einfache Dinge auch mit einer kryptischen
post-fix Sprache loesen kann
-- Daniel Hottinger
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