[Cado-nfs-discuss] cado-nfs-2.1.1 crash during filtering

Greg Marks marks at member.ams.org
Sat Jun 13 09:42:20 CEST 2015

Thank you for your help.  The documentation in scripts/cadofactor/README
does advise adjusting the value of tasks.sieve.sieving.qmin although
it wasn't quite so explicit about what it should be changed to.
I thought omitting this step would simply lead to extra time spent
removing duplicates, not a program crash.  Incidentally, is that a typo
in scripts/cadofactor/README: is tasks.sieve.sieving.qmin supposed to
be tasks.sieve.qmin?

Greg Marks

   | Greg Marks                                     |
   | Department of Mathematics and Computer Science |
   | St. Louis University                           |
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Message from Francois Morain <morain at lix.polytechnique.fr>
of June 13, 2015, 09:22:06 +0200, follows:
> I had the very same problem yesterday. The problem is this: if you
> import relations, you must reset the value of qmin to the last value
> of special-q used (the largest number in all the *sieve*.gz).
> Otherwise, you restart with the same special-q's and then you get
> zillions of duplicate relations which make dup1 doing its job
> and this explains the 0 size file.
> As for the comments about regenerating things already done, I think
> this is under study, because we are plenty of customers having the
> same problem. Importing bases and such would be handy.
> Hope this helps,
> FM
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