At 07:16 AM 8/17/02 -0700, you wrote: >It is my understanding from reading the documentation that setting the >available memory only affects the P-1 factoring stage and not the main >LL test. Is this correct? > >The reason I am asking is because of a great difference that I have >noticed in the iteration time of the LL test on my 2.2GHz desktop and my >1.0GHz laptop while running comparable sized numbers on both machines.
Clock speed is not the only determinant. Chip internals have a lot to do with it, too. Cache size, instruction set, RAM type and speed all affect iteration time. That's a 2.2 Ghz P4, and what chip in the notebook? The P4 has SSE2 instruction sets, which make it faster than, say, an Athlon 2.2Ghz (if such existed). If it's a Celeron, the cache is smaller, making it even slower. >The desktop is a Pentium IV while the laptop is a III. Could this >account for the difference? Absolutely. SSE and cache both conspire against the comparison, as may the RAM in the notebook. _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
