Discussion related to cado-nfs

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

       Dear David,

you can restart the linear algebra directly by running the bwc.pl command
at the top of c155.bwc.stdout.1.

Now it might be that one of the stored linear algebra files in c155.bwc is
truncated. For example for the c60 from README we have:

-rw-r--r-- 1 pzimmermann users 153600 Dec  9 14:43 A0-64.0-300
-rw-r--r-- 1 pzimmermann users  47616 Dec  9 14:43 F.sols0-64.0-64
-rw-r--r-- 1 pzimmermann users  48352 Dec  9 14:43 V0-64.0
-rw-r--r-- 1 pzimmermann users  48352 Dec  9 14:43 V0-64.100
-rw-r--r-- 1 pzimmermann users  48352 Dec  9 14:43 V0-64.200
-rw-r--r-- 1 pzimmermann users  48352 Dec  9 14:43 V0-64.300

All files of the same type should have the same size. If one is short,
just remove it (or move it to another place) and restart the bwc.pl command.

Best regards,
Paul Zimmermann

> From: David Willmore <davidwillmore@gmail.com>
> Date: Mon, 9 Dec 2019 06:27:52 -0500
> 
> Hello, all.  I have been factoring a ~c155 for a few days and it
> failed last night on the linear algebra step.  It seems my /tmp had
> too little space for it to do the work.  As an attempt to remediate
> that, I moved the directory out of temp and onto a partition with
> plenty of space.  I placed a symlink from /tmp to the new location.
> 
> Upon restarting the cado-nfs.py script with the location of the
> recovery parameter file, I was told that there was a short read from
> the .prep file.  Moving that out of the way and restarting resulted in
> the same error.
> 
> My question is how to recover from this and restart from the last good 
> point?
> 
> Thank you for your work on this wonderful tool.  I'm afraid I've been
> out of factoring for the last decade and I'm not fully up to speed on
> the current crop of tools.
> 
> Cheers,
> David Willmore
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