Re: New Machine; ...SETI problems.

** Reply to message from "David Raison" <djr@xxxxxxxxxxx> on Wed, 21 Nov 2007
15:39:05 +0000


>On Wed, 21 Nov 2007 07:16:12 -0800 (PST), Andreas Ludwig wrote:
>
>>That's correct. Same thing happens here for the last 2 years - with 2 
>>physical 
>>CPUs that is ;o)
>
>Two reasons I know of for this:
>1. The idea is that each WU can run (as much as possible) in the onchip cache 
>of a single CPU.
>If one unit were split between two (or more CPUs) it would have to keep
>migrating from one chip cache to another - negating the benefit of that cache.
>2. The WU algorithm would have to be made multi-threaded to benefit from the
>extra CPUs - which is in itself a non-trivial task :)

Still working with a single processor system I have no experience in this
matter. But it looks like if you go to
<http://setiathome.berkeley.edu/prefs.php?subset=global> and then click on
"Edit Preferences" there is a setting "On multiprocessors, use at most x        
processors" which looks like you can control the number of processors used by
Seti.

-- 
John Small