On Thursday 29 August 2002 13:30, Gary Edstrom wrote: > I have noticed a small but definite increase in the iteration time of > version 22.8.1 as opposed to 21.4. > > During the night, when my 2.2GHz Pentium IV system was free of all other > processing activities, the iteration times were as follows: > > 21.4 47 msec > 22.8.1 50 msec
Is the exponent very close to the run length threshold? If so you're now running with per-iteration roundoff checking. On my P4 1.8A (with PC800 RDRAM) I found this made very little difference, but systems with more limited memory bandwidth may be more affected by this. > > I am continuing processing on the very same exponent using the new > version. Is this allowed? It works, reliably, though sometimes the FFT run length may change at the time of the upgrade. Regards Brian Beesley _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
