[Cado-nfs-discuss] What to do after a crash?

Alexander Kruppa alexander.kruppa at inria.fr
Tue Sep 16 11:33:20 CEST 2014

----- Original Message -----
> From: "Nicolas RUFF" <nicolas.ruff at gmail.com>
> To: cado-nfs-discuss at lists.gforge.inria.fr
> Sent: Tuesday, 16 September, 2014 11:06:13 AM
> Subject: [Cado-nfs-discuss] What to do after a crash?
> Hello,
> Sorry for the newbie question. I have been running a quite long
> factorization job on my workstation, and for some reason it crashed after a
> few weeks.
> [...]
> OSError: [Errno 2] No such file or directory:
> '/tmp/cado.PgpD3dAfkM/c154.factorbase.roots.gz'
> FAILED ; data left in /tmp/cado.PgpD3dAfkM
> $ ls /tmp/cado.PgpD3dAfkM/
> c154.db  c154.db-shm  c154.db-wal  c154.log  c154.upload  c154.wucmd  client
> Now the question: is there any way to resume computation from the point it
> has stopped?
> Thank you,
> - Nicolas RUFF

There should be more files in the working directory than your "ls" command shows.
It is possible that a system housekeeping job has deleted some files in /tmp/.

The first thing I'd do is copy the contents of /tmp/cado.PgpD3dAfkM/c154.upload/
to somewhere safe; those files include the siever output files which are the most
computationally expensive part of the factorization.

Can you please send me the output of
cd /tmp/cado.PgpD3dAfkM/c154.upload/; ls
so I can tell which files may have been deleted and which remain? If any
substantial number of files survived, we can start a new factorization
and import the already existing files; if no or very few files remain,
I'm afraid the only real option is to start over from scratch.


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