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Re: [cado-nfs] Issue with "purge" on C210 GNFS


Chronological Thread 
  • From: Markus Tervooren <mail@markustervooren.de>
  • To: Paul Zimmermann <Paul.Zimmermann@inria.fr>
  • Cc: cado-nfs@inria.fr
  • Subject: Re: [cado-nfs] Issue with "purge" on C210 GNFS
  • Date: Thu, 3 Oct 2024 21:31:24 +0200
  • Authentication-results: mail3-smtp-sop.national.inria.fr; spf=None smtp.pra=mail@markustervooren.de; spf=Pass smtp.mailfrom=mail@markustervooren.de; spf=Pass smtp.helo=postmaster@sxb1plsmtpa01-01.prod.sxb1.secureserver.net
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  • Ironport-sdr: 66fef114_N2bsasikb2wv9YQmBkA7YIvTuZ409jZ4F0i+IpiihYQTYZ1 vvPYJpLRV0058ZuqIfylggXPsuFN26BVHYw7GGA==

Dear Paul,

I successfully obtained a suitable matrix and have now begun the BWC step.

Sieving parameters were:

-q0 1000000 -q1 920000000 -A 31 -lim0 300000000 -lim1 300000000 -lpb0 35 -lpb1 35 -mfb0 86 -mfb1 96 -ncurves0 20 -ncurves1 20

For a total of 3B raw relations. After dup2, 1.9B relations remained. Including all relations up to 35 bits resulted in a significantly better matrix compared to using only 34 bits - these were removed after sieving.

The purge process reduced the total to 249 million relations:

Step 0: only singleton removal
Sing. rem.: begin with: nrows=1917941307 ncols=1948512258 excess=-30570951 at 2883.09
Sing. rem.:   iter 001: nrows=1155353090 ncols=1012751300 excess=142601790 at 4037.84
Sing. rem.:   iter 002: nrows=976499437 ncols=821895684 excess=154603753 at 4521.78
Sing. rem.:   iter 003: nrows=929047533 ncols=773453347 excess=155594186 at 4857.31

...

Sing. rem.:   iter 002: nrows=249083636 ncols=249083416 excess=220 at 56595.46
Sing. rem.:   iter 003: No more singletons, finished at 56675.36

Matrix: total 71851914 rows 71851662 cols 10096684980 coeffs

krylov: N=60000 ; ETA (N=2248000): Wed Oct 30 03:07:17 2024 [1.100 s/iter]

Expecting factors in about 45 days. The composite is part of aliquot sequence 162126, index 4412.

Suggestions for better parameters are always welcome.

Markus


Am 24.09.24 um 10:14 schrieb Paul Zimmermann:
Dear Markus,

turns out I forgot to include the free relations into nrels. After doing so
there is no error anymore.
great to hear! Please tell us if you manage to complete your factorization.

Paul

Attachment: OpenPGP_signature.asc
Description: OpenPGP digital signature




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