[Cado-nfs-discuss] Lingen solution not found

Soundcheck Team soundcheck2014 at gmail.com
Fri Jul 11 10:15:59 CEST 2014

Thanks for your helpful response!
We are using version 2.0 updated to commit
39075958e0fda9e3187f60719bc61f3c96d206ac (The last build about when we
We did get a full disk in the middle of the krylov phase, which caused A*
files (files with names like A0-64.0-149900) to be created with length 0.
We stopped the process and erased all files in the c204.bwc directory
created since the first such file was created, ghosted the disk to a larger
one and then resumed. Could there still be corrupted files? We also had to
resume a few times due to server crashes.
I'm attaching the last bwc logs; However the whole log file is 486 MB; is
there a specific part of it that could help?
Thanks again,

On 9 July 2014 21:45, Zimmermann Paul <Paul.Zimmermann at inria.fr> wrote:

>        Dear Eran,
> > Date: Wed, 9 Jul 2014 19:59:00 +0300
> > From: New Name <soundcheck2014 at gmail.com>
> >
> > Hi,
> > We've been using CADO-NFS to factor a large number (640 bit), finally
> > reached the lingen subphase of the Linear Algebra phase but we got an
> error
> > - "no solution found". Are there any known issues which could cause this?
> > Notable issues in our run so far:
> > - We're using the default c204 params file even though the number is a
> bit
> > smaller (196 digits) as there is no 196 digit param file.
> this should not be a problem.
> > - Are there any issues in lingen when lpbr>32 ? Should we have used non
> > default parameters?
> no, we already used a large prime bound of 2^33 for RSA-704 for example.
> > - We had to resume the krylov sub phase a few times.
> my guess is that one of the checkpoints was corrupted. Usually this is
> due to a full disk.
> > Any help would be wonderful,
> > Eran
> please can you send us the full *.log file, and the *bwc*stdout and
> *bwc*stderr files? Also which version of CADO-NFS are you using?
> Best regards,
> Paul Zimmermann
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