20060215, 09:14  #1 
(loop (#_fork))
Feb 2006
Cambridge, England
3×19×113 Posts 
What kind of computer _is_ colossus?
Very few of the computer names in the nfsnet participant list give any indication of what the hardware is; I think that information is collected but not given out.
On the other hand, the most obvious feature of the list is cage's computer 'colossus', which has about fifty times the throughput of my G4/1400 Mac Mini, and ten times the throughput of any other computer on the table; it's performing about a third of the searching on its own. Is this spare time on a remarkably underused large SMP box, or something more interestingly exotic like a fairly standard PC with lots of memory running lattice rather than line sieving? On a different note, what kind of extra performance do people with dualcore systems see when running two copies of NFSNET? Sieving is proverbially cacheunfriendly, so I'd fear that the memory bandwidth got constricted. 
20060215, 13:04  #2  
Nov 2003
2^{2}·5·373 Posts 
Quote:
I get about a 20% throughput increase when 2 copies of my lattice siever on my (hyperthreaded) 3.4GHz IA32. (versus running one copy) Of course one needs enough memory to run 2 copies. 

20060215, 15:24  #3  
Sep 2005
UGent
2^{2}×3×5 Posts 
Quote:
It belongs to the Pure Math department of Ghent University. Currently it's completely idle, but not for long anymore, when I'll start wasting time on the ABCconjecture. 

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