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Originally Posted by batalov
2) (rarely visited; you are here!) almost enough relations; -nc1 makes cycles, -nc2 builds a matrix, cleans it up and then the matrix is not useable => Sieve some more;
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Looking at the relation count, I think this is where you were, h, one more sieve block might have done it......looking back at similar sized jobs, mine needed slightly more relations than you had.
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Originally Posted by 10metreh
When did nice splits make factorizations fail?
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Probably not fail, maybe just need a few more relations than usual. It'd be interesting to see if other folks have had any problems with 50/50 splits on their jobs.
Maybe the solution is to keep 1.39 around as a fallback if there are similar problems in the future.