lanczos error: submatrix is not invertible

Mini-Geek · 2014-02-12, 18:49

I'm trying to postprocess GC_6_302 using Brian Gladman's 1.52dev SVN 942 Windows build. I get this error when the Lanczos begins:

Code:

Wed Feb 12 12:07:54 2014  commencing Lanczos iteration (4 threads)
Wed Feb 12 12:07:54 2014  memory use: 3067.7 MB
Wed Feb 12 12:08:22 2014  lanczos error: submatrix is not invertible
Wed Feb 12 12:08:22 2014  lanczos halted after 4 iterations (dim = 191)
Wed Feb 12 12:08:22 2014  linear algebra failed; retrying...
Wed Feb 12 12:08:22 2014  commencing Lanczos iteration (4 threads)
Wed Feb 12 12:08:22 2014  memory use: 3067.7 MB
Wed Feb 12 12:08:33 2014  lanczos error: submatrix is not invertible
Wed Feb 12 12:08:33 2014  lanczos halted after 1 iterations (dim = 0)
Wed Feb 12 12:08:33 2014  linear algebra failed; retrying...

I've heard that there is a newer build of msieve, about SVN 956, but I don't know of any 64-bit Windows builds of it available. I didn't specify a target_density for this attempt.
Does this build have problems post-processing, or is there something else wrong?

fivemack · 2014-02-12, 22:54

Yes, I think 942 is a version which has the memory-corruption bug, whose symptoms include that message.

wombatman · 2014-02-12, 22:56

You can try this one if you like. I use it without issue. You may need a pthread dll, but you should be able to find that no problem.

Edit: Note that this one does NOT have CUDA enabled. I use it just for the linear algebra.

VBCurtis · 2014-02-13, 00:34

I have been using the windows 1.52 'official' release from souceforge since Jason announced it (see announcements thread). Is that 32-bit only? That release includes the dlls too.

Mini-Geek · 2014-02-13, 04:06

Quote:

Originally Posted by wombatman

You can try this one if you like. I use it without issue. You may need a pthread dll, but you should be able to find that no problem.

Edit: Note that this one does NOT have CUDA enabled. I use it just for the linear algebra.

Got it working using this, thanks!

wombatman · 2014-02-13, 04:13

Quote:

Originally Posted by VBCurtis

I have been using the windows 1.52 'official' release from souceforge since Jason announced it (see announcements thread). Is that 32-bit only? That release includes the dlls too.

I think so.

Mini-Geek, happy to help!

jasonp · 2014-02-13, 14:38

The sourceforge release is only for 32-bit windows. Any other binaries will have to come from elsewhere.

2014-02-12, 22:54	#2
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 14423₈ Posts	Yes, I think 942 is a version which has the memory-corruption bug, whose symptoms include that message. Last fiddled with by fivemack on 2014-02-12 at 22:54

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2014-02-13, 00:34	#4
VBCurtis "Curtis" Feb 2005 Riverside, CA 4,861 Posts	I have been using the windows 1.52 'official' release from souceforge since Jason announced it (see announcements thread). Is that 32-bit only? That release includes the dlls too.

2014-02-13, 14:38	#7
jasonp Tribal Bullet Oct 2004 3,541 Posts	The sourceforge release is only for 32-bit windows. Any other binaries will have to come from elsewhere.