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Old 2021-09-24, 06:17   #56
frmky
 
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Originally Posted by charybdis View Post
@frmky, for future reference, when I tested this I found that rational side sieving with *algebraic* 3LP was fastest. This shouldn't be too much of a surprise: the rational norms are larger, but not so much larger that 6 large primes across the two sides should split 4/2 rather than 3/3 (don't forget the special-q is a "free" large prime).
I'll try that, thanks!
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Old 2021-09-24, 06:21   #57
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filtering yielded
Code:
matrix is 102063424 x 102063602 (51045.3 MB) with weight 14484270868 (141.91/col)
Normally I'd try to bring this down, but testing on a quad V100 system with NVLink gives
Code:
linear algebra completed 2200905 of 102060161 dimensions (2.2%, ETA 129h 5m)
And it's done. LA on the 102M matrix with restarts took 5 days 14 hours.
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Old 2021-09-24, 12:36   #58
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I'll try that, thanks!
Also 250M is very low for alim/rlim at this size; some quick testing suggests the optimum is likely between 500M and 1000M. Is this done to keep memory use low? How many 16f contributors don't have the 1.5GB per thread needed to use lim=500M?
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Old 2021-09-24, 13:40   #59
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Originally Posted by charybdis View Post
Also 250M is very low for alim/rlim at this size; some quick testing suggests the optimum is likely between 500M and 1000M. Is this done to keep memory use low? How many 16f contributors don't have the 1.5GB per thread needed to use lim=500M?
95%.
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Old 2021-09-24, 15:13   #60
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Originally Posted by charybdis View Post
Also 250M is very low for alim/rlim at this size; some quick testing suggests the optimum is likely between 500M and 1000M. Is this done to keep memory use low? How many 16f contributors don't have the 1.5GB per thread needed to use lim=500M?
A large fraction encounter issues when exceeding 1GB/thread, so I stay a little below that.
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Old 2021-09-24, 15:50   #61
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If lims have to stay at 250M, it would probably be possible to stretch the upper limit of doable jobs a bit by using 3LP on both sides to catch some of the relations that are lost due to the low lims. This makes sec/rel ~30% worse but increases yield by ~50%, while also increasing the number of relations needed by some unknown amount (almost certainly below 50%) and making LA that bit harder as a result.

But as long as you can cope with lpb 34/34 and 3LP on only one side, there shouldn't be any need for this.
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