20191207, 18:48  #1 
Oct 2007
London, UK
5·263 Posts 
Help resuming linear algebra step
So, my machine had been running linear algebra for six and a half hours, with only 5 minutes to go I think, "It's close enough, I'll play some counterstrike while it finishes." I load the game and ... of course I get a blue screen.
No worries, there are checkpoints right? So I run msieve s test.dat l test.log i test.ini nf test.fb t 4 nc2 again and: Code:
commencing linear algebra read 3880716 cycles cycles contain 12919660 unique relations read 0 relations error: cannot locate relation 44290431 And it wipes the test.dat.mat file for good measure. Luckily I'd made a backup of everything first. Then I see there are TWO checkpoint files, test.dat.chk and test.dat.bak.chk. So I try using the second checkpoint file and get the same error. Is there anything I can do to rescue the process at this point without running the entire linear algebra step again? Last fiddled with by lavalamp on 20191207 at 18:54 
20191207, 19:09  #2  
"Ed Hall"
Dec 2009
Adirondack Mtns
2·1,723 Posts 
Quote:


20191207, 19:13  #3  
Oct 2007
London, UK
5×263 Posts 
Quote:
Seems a bit dangerous that nc2 deletes past progress then fails with an error instead of checking first to be honest. I'm very glad I made a manual backup first. 

20191207, 19:30  #4 
"Ed Hall"
Dec 2009
Adirondack Mtns
D76_{16} Posts 
Glad to hear it worked. Yeah, other programs like ggnfs and YAFU refuse to run if they find partial results. I have suffered the loss you (temporarily) experienced. I try to remember the "r" these days.

20191209, 04:23  #5 
Tribal Bullet
Oct 2004
3·1,163 Posts 
The code doesn't know the difference between running in a directory with checkpoint files you don't want versus continuing a job with checkpoint files you do want. It would be a nice feature to encode a fingerprint of the factorization into the temporary files generated.

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