Discussion related to cado-nfs

[David Willmore <davidwillmore@gmail.com>]

And it ends in sadness because of user error.  I'll be rerunning it
with the correct settings (and a proper temp dir).  I'll know more in
a week.  Thanks again for the assistance.

On Mon, Dec 9, 2019 at 4:01 PM Emmanuel Thomé <Emmanuel.Thome@inria.fr> wrote:
>
> Hi,
>
> Glad that you were able to solve your problem.
>
> For the record:
>
> On Mon, Dec 09, 2019 at 02:09:33PM -0500, David Willmore wrote:
> > Writing balancing data to c155.sparse.4x6.bin
> > write(cached matrix file): No space left on device
> > write(cached matrix file): No space left on device
> > write(cached matrix file): No space left on device
> > write(cached matrix file): No space left on device
> > /home/willmore/factoring/cado-nfs-2.3.0/build/blade/linalg/bwc/prep:
> > exited with status 1
> > aborted on subprogram error at
> > /home/willmore/factoring/cado-nfs-2.3.0/build/blade/linalg/bwc/bwc.pl
> > line 512.
> >         ...propagated at
> > /home/willmore/factoring/cado-nfs-2.3.0/build/blade/linalg/bwc/bwc.pl
> > line 1406.
>
> In this situation, the cached matrix files that are written in the
> directory c155.bwc/c155.sparse.4x6/ are unusable and must be
> redone. It would have been sufficient to just remove that directory, as
> the cached matrix files would have been recomputed by whatever bwc binary
> was left to call (prep).
>
> And it's an obvious misfeature that cado-nfs does the write to the final
> path of the cached matrix file, in fact. Instead, it should write to a
> temp file, and attempt a filesystem reame (mv) operation, which is atomic
> in most cases. However, in cases where the filesystem is full, we would
> just be trading an error message for another one anyway.
>
> E.
>
> >
> > > From Paul.Zimmerman@inria.fr
> > > you can restart the linear algebra directly by running the bwc.pl 
> > > command
> > > at the top of c155.bwc.stdout.1.
> > > ...
> > > 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.
> >
> > Nice to hear from you again, Paul.  It's been a long time.
> >
> > That seems to have done it.  I've moved all of those files out as they
> > were of several different lengths and restarted the command.
> >
> > It's running now. Will this complete the factorization or will I need
> > to manually perform any other steps after this?
> >
> > Thank you both for your help!  I'll share my results with the group if
> > anyone is interested.
> >
> > Cheers,
> > David Willmore
> >
> > On Mon, Dec 9, 2019 at 8:46 AM Emmanuel Thomé <Emmanuel.Thome@inria.fr> 
> > wrote:
> > >
> > > On Mon, Dec 09, 2019 at 06:27:52AM -0500, David Willmore wrote:
> > > > 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.
> > >
> > > Can you give the exact error message please ? You can probably find it 
> > > in
> > > files called c155.bwc.std*
> > >
> > > You might want to try to remove the cache directories c155.bwc/c155.*x*/
> > > ; those are likely to contain files that were written incompletely.
> > >
> > > E.