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Old 2021-03-05, 19:45   #936
VBCurtis's Avatar
Feb 2005
Riverside, CA

3×1,579 Posts

Is there a sense that the filtering bug was squashed, and only the size of the dataset is in the way of filtering jobs this size?

Seems 33/35 is better than 33/36 for this job, to shrink the dataset by 25% (say, 2.1B uniques rather than 2.8B).

I suppose it only matters in principle, since matrix size also stands in the way of trying an even-tougher job.

Bravo for slaying this beast, all the same! Well, almost done..
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Old 2021-03-07, 05:23   #937
frmky's Avatar
Jul 2003
So Cal

1000001000112 Posts

I think so... Certainly hope so! Filtering with lots of excess relations is still hard so things could go awry there, but with a reasonable excess the remaining limit is 2^32 total, not unique, relations. With prior duplicate and perhaps singleton removal, this permits large runs.

The size of the dataset isn't much of an issue. The filtering running time is dwarfed by both the sieving and LA running times anyway, and someone completing numbers this size likely has access to a computer with sufficient storage and memory.

200G Mar  6 01:55 msieve.dat.gz

reading ideals above 720000
commencing singleton removal, initial pass
memory use: 41024.0 MB
reading all ideals from disk
memory use: 87634.0 MB
keeping 1372156493 ideals with weight <= 200, target excess is 10188461

Last fiddled with by frmky on 2021-03-07 at 05:28
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Old 2021-03-09, 11:38   #938
lavalamp's Avatar
Oct 2007
Manchester, UK

101001111112 Posts

Finally finished my ECM work on the t2200 file!

Composites larger than 2^1018 have had 224 curves @ B1=50e3, B2=13.7e6 (25 digit level).

Composites less than 2^1018 have had 1152 curves @ B1=3e6, B2=14e9 (40 digit level).

The total haul is 815 factors, these have been submitted to factordb, and attached to this post.
Attached Files
File Type: txt opn_t2200.txt (91.7 KB, 37 views)
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Old 2021-03-25, 12:10   #939
Pascal Ochem
Pascal Ochem's Avatar
Apr 2006

2×72 Posts

Thanks! That is a lot of factors, with an explicit lower bound on the ECM effort for these numbers.
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Old 2021-03-26, 16:59   #940
ThomRuley's Avatar
May 2003

3708 Posts

That's a great idea. What is the current ECM status on the t2200 composites?
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Old 2021-03-29, 18:31   #941
ryanp's Avatar
Jun 2012
Boulder, CO

22×3×23 Posts

Here's the latest on the #1 MWRB, with frmky lending a helping hand for the LA:

linear algebra completed 20216008 of 109441779 dimensions (18.5%, ETA 854h19m)
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