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Old 2020-04-07, 18:08   #7
VBCurtis
 
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"Curtis"
Feb 2005
Riverside, CA

116038 Posts
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For a job big enough to produce a 20M+ matrix, failing to build at TD100 is an indication that more relations are needed. It's not that density 100 will shrink the matrix some magical amount, rather that having enough relations to build at 100 or 110 will also be enough relations to shrink the matrix another 10% or so.

As a guess, 5% more relations would shrink the matrix 10%. Not usually a great tradeoff, but when you have a sieving farm it's surely a plus for you!

A note on the GNFS175 file: Qmin is so small that ETA will start out about 2/3rds of what it will actually take to gather the relations. The sievers are really efficient at small Q, at the cost of some extra duplicates and CADO making empty promises about a fast job.
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