Quote:
Originally Posted by axn1
Here, one cannot discount the LL cost.
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Let http://mersenneforum.org/cgibin/mimetex.cgi?t</IMG> be the LL cost
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The table gives the break even pts for each of the P1 levels as specified.
Now, the thing to note is that, given a sufficiently large , a combo with a lower coefficient for /will/ be better. So let's calculate how large is sufficiently large.

No, no, that's not how Prime95 works.
It's not choosing an exponent (or choosing an LL cost) to best utilize combination X, or Y, or Z. If one wants to analyze that way, one
can, but that's not what the Prime95 software is doing.
When Prime95 is given the task of choosing a B1/B2 combination for doing P1 on some exponent, it's selecting the combination that's most efficient to use
on the given exponent (while also taking into consideration the specified "Available Memory", the CPU type, and the bitlevel to which the exponent has been previously TFed). So the LL cost is not a variable whose value can be chosen; it's a constant during any one search for an optimal B1/B2 combination.
In my example, combinations X, Y, and Z are just representing three out of hundreds or thousands of possible combinations that Prime95 examines each time it's choosing P1 bounds for one single exponent.