At 15:14 01/22/2000 -0500, George Woltman wrote:
>
>Finding new factors isn't hard. Over half of the candidates are eliminated
>by finding a factor rather than the expensive LL test. GIMPS by default
>assigns slower machines to do the factoring work. Thus, it is not
>uncommon for powerful machines to always get LL assignments and
>never find a factor.
This brings up something I've been wondering about. I have a dual Celeron
setup running 2 instances of mprime under Linux. With both processors
crunching on LL tests, I get iteration times for each processor of around
.263 for exponents around 8990000 (where they are presently cranking).
However, if one of them factors while the other does LL testing, the
processor doing the LL testing takes about .220 seconds per iteration,
while the one factoring also shows a factoring speed more consistent with
the speed I would expect for the processor speed.
My question is: Do I get more "work" done by having both doing LL testing,
or would this box contribute more to the effort by having one CPU
performing factoring while the other does LL testing?
Thanks!
Kel, coming up on 4 years of hunting for Mersenne primes
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