Re: buildworld times

On Sun, 29 Feb 2004, Andre Guibert de Bruet wrote:

> On Sun, 29 Feb 2004, Bob Willcox wrote:
>
> > On Sun, Feb 29, 2004 at 07:52:31PM +0200, Evren Yurtesen wrote:
> > > Sorry, my mistake...I guess it was taking longer than 15 minutes... :(
> > > 41m51.44s real          24m52.18s user          14m56.58s sys
> > >
> > > I dont know how could I get 15 last time, if I forgot to do make clean
> > > or something, or a lot of stuff was cached in the memory maybe? I think
> > > I did it 2 times in a row :) I guess doing from a memory disk would
> > > enhance things a lot.
> >
> > I've never experienced _that_ big (3-fold) of difference when running
> > buildworlds back-to-back though.
>
> Even on a somewhat idle machine with multiple gigabytes of high-bandwidth
> memory, you're only going to be shaving a couple of minutes. Buildworld
> times are strongly affected by the underlying storage's seek time and
> write latency.

	A good point.  On my notebook which is the one in question, the
CPU P4M-2.6Ghz runs at 400FSB (100x4) while the memory runs at 266Mhz DDR
so while it is from the Northwood family of processors, the memory seems
to be the bottleneck as it's 2.1GB/sec memory and not 3.2GB/sec like
current platforms are seeing.   According to AIDA, I'm using a Hitachi
TravelStar 2.5" 7200RPM 7K60 HDD which has a average seek of 10ms, no idea
on the write latency but the Max sustained transfer rate is 518 Mbit/sec
with the 8 MB buffer being capacle of 100 MB/sec but the chances of the
buffer being used is slim as 8MB doesn't hold a lot.


Cheers,
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