[Leica] Lightroom on 8-core Mac Pro

[scheng at aotera.org (Spencer Cheng)]

Hi Ken,

All the fast processors are I/O bound and disk I/O is several orders  
of magnitude slower than any other storage but magnetic tape or bubble  
memory. :)

The rule of thumb is if you want to applications to run faster, first  
add memory until you can't add any more and THEN get a faster disk  
(with as big of a RAM cache as you can find).

And I agree you are most likely I/O bound though it could be a  
threading limit inside your application as 50% sounds suspicious. :(

Regards,
Spencer

On Feb 4, 2008, at 18:48, Ken Iisaka wrote:

> Just browsing through the photographs and adjusting colours, I  
> rarely see
> the CPU load go above 20%.
>
> I just did an experiment, creating 50 jpegs from M8 DNG files took  
> less than
> a 40 seconds, and the CPU was usually around 50% busy.  I have a  
> feeling
> that I am constrained by disk I/O.
>
> I thought of going cheap and get a single quad core processor, but the
> reduction in price ($500) is so much less than what the chip costs  
> on the
> street, should I decide to go 8-core.
>>