Prime95 30.8 (beta, big P-1 changes, see post #551)

[Prime95]

Originally Posted by axn

Doesn't make sense. WIth PFactor, the bounds are determined by the number of tests saved. If it already has a factor, then why bother? Pminus1 has exactly what you need.

Originally Posted by James Heinrich

Sure it makes sense. It allows me to quickly and easily ask Prime95 to do a "good" or "great" or whatever kind of P-1 without me performing any kind of calculations.

axn is correct that optimizing bounds to maximize saving PRP/LL CPU time is different than optimizing bounds to find as many factors as possible in a unit of wall clock time.

James is correct that Pfactor provides a simple interface to pick some reasonable-ish bounds where "tests saved" can instead be viewed as "level of effort".

In truth, it is impossible to choose good P-1 bounds without considering how much P-1 has already been done. Even then, good bounds are still subjective -- choose to low and someone will have to redo it at a later date, choose too high and you'll not finish P-1 on all the exponents of interest.

That said, I am not philosophically against enhancing Pfactor with known factors.