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Old 2021-07-19, 15:57   #6
chris2be8
 
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Sep 2009

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I'm not sure if this applies to CADO-NFS, but with the ggnfs sievers used by NFS@Home yield often peaks or at least changes trend when special-Q is the same as the factor base size on the side you are sieving (the siever cuts the factor base size down to special-Q when sieving below factor base size). So you should always sieve one range at the factor base size as well as the start and end of the range you hope to sieve on (and as many intermediates as you have time for), then you can assume yield varies linearly between points where you test sieved.

It's not exact since yield isn't precisely linear but usually near enough to do the job. And gets more accurate if you sieve more ranges with smaller gaps between them.

Chris
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