Discussion related to cado-nfs

[Zimmermann Paul <Paul.Zimmermann@inria.fr>]

       Andrew,

> Date: Sun, 30 Mar 2014 20:32:35 -0400
> From: Andrew Johnston <ajohnston9@fordham.edu>
> 
> Hello,
> 
> I'm looking to factor some rather large numbers with CADO-NFS but could not
> find sufficient documentation regarding staged execution and MPI
> capabilities.
> 
> I'd like to run different parts of GNFS on different computers, and from
> what I could find CADO saves its progress (e.g. the polynomial, relations,
> etc.) and I should be able to move these files to different computers and
> rerun. Where can I find these files during execution? Further, how can I
> instruct CADO only to do a specific stage (e.g. only do polynomial
> selection)?

so far there is no way to run only one step, however in 
scripts/cadofactor/README you'll find instructions on how to import an
already computed polynomial, or already computed relations.

> Further, I've read that CADO supports MPI when run from a perl script,
> however I could not determine which script I would need to run to utilize
> MPI. How do I enable this functionality?

see linalg/bwc/README and local.sh.example

> I apologize if I'm asking questions that can be answered in the
> documentation, but I could not find any resources on the subjects.
> 
> Best Regards,
> 
> Andrew H. Johnston

I have added the above pointers in the top-level README in the git version,
please tell me if it is ok now.

Best regards,
Paul Zimmermann