Re: tlug: Re: linux cluster

[Scott Stone <sstone@example.com>]

On Thu, 15 Oct 1998, Darren Cook wrote:

> >[If] your main bottleneck is CPU <-> memory bandwidth. This
> >implies two things:
> >
> >* Buy the biggest cache you can get
> 
> Pentium-II seems limited to 512Kb cache. The next Intel chip is supposed to
> have larger cache (and be better designed for parallel processing), but it
> is going to be *much* more expensive. 

hm, AMD K6s can handle more than 512kb...

> 
> >(and write your
> >  application cache-friendly)
> 
> What does this mean? If it's answered in the great link (
> http://www.mcs.anl.gov/dbpp/ ) you gave yesterday, ignore this question, as
> I'm working through that site. :-)
> 
> >* don't use two-processor boards.
> >
> >The two processor will only end up competing for bus access,
> >instead of doing your float calculations.
> 
> I also read somewhere that even if the data set is small enough to fit in
> the processor cache, on a dual processor machine they have to spend time
> comparing the two caches to make sure the processors are not altering the
> same memory. Single processors in a cluster won't have this problem.
> 
> Darren
> 
> 
> 
> ---------------------------------------------------------------
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> 

--------------------------------------------------
Scott M. Stone <sstone@example.com, sstone@example.com>
               <sstone@example.com>
Head of TurboLinux Development/Systems Administrator
Pacific HiTech, Inc (USA) / Pacific HiTech, KK (Japan)
http://www.pht.com		http://armadillo.pht.co.jp
http://www.pht.co.jp	        http://www.turbolinux.com


---------------------------------------------------------------
Next Nomikai: 20 November, 19:30 Tengu TokyoEkiMae 03-3275-3691
Next Meeting: 12 December, 12:30 Tokyo Station Yaesu central gate
---------------------------------------------------------------
Sponsor: PHT, makers of TurboLinux http://www.pht.co.jp