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Old 2022-05-11, 23:54   #562
Prime95
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Aug 2002
Yeehaw, FL

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Quote:
Originally Posted by axn View Post
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.
Quote:
Originally Posted by James Heinrich View Post
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.
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