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-   -   Pascal's OPN roadblock files (https://www.mersenneforum.org/showthread.php?t=19066)

VBCurtis 2021-03-05 19:45

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..

frmky 2021-03-07 05:23

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.

[CODE]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[/CODE]

lavalamp 2021-03-09 11:38

1 Attachment(s)
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.

Pascal Ochem 2021-03-25 12:10

Thanks! That is a lot of factors, with an explicit lower bound on the ECM effort for these numbers.

ThomRuley 2021-03-26 16:59

That's a great idea. What is the current ECM status on the t2200 composites?

ryanp 2021-03-29 18:31

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

[CODE]linear algebra completed 20216008 of 109441779 dimensions (18.5%, ETA 854h19m)[/CODE]

ryanp 2021-05-05 18:32

Thanks in large part to frmky's help with the filtering fix and running LA, the #1 MWRB has fallen.

[url]http://factordb.com/index.php?query=6115909044841454629%5E17-1[/url]

frmky 2021-05-05 18:49

Here's the log for posterity.

[PASTEBIN]ziQFbDHJ[/PASTEBIN]

pinhodecarlos 2021-05-05 19:50

Congrats, well done gents!

Pascal Ochem 2021-05-05 20:19

Ryan, frmky, thank you.
Now I explore the subtrees unlocked by the new factors for lower bounds on many parameters of an OPN.

charybdis 2021-05-05 21:36

[QUOTE=ryanp;577739]Thanks in large part to frmky's help with the filtering fix and running LA, the #1 MWRB has fallen.

[url]http://factordb.com/index.php?query=6115909044841454629%5E17-1[/url][/QUOTE]

:bow wave:

Glad to see this completed successfully without any further bugs. I presume this means the 4G relation limit is now the limiting factor in the size of jobs that can be run with msieve?


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