[Cado-nfs-discuss] "characters" fails with "all dependencies are zero"

Emmanuel Thomé emmanuel.thome at gmail.com
Mon Aug 4 13:46:01 CEST 2014


Hi Raphael,

Do you have the complete bwc.log transcript ? If you used bwc.pl
:complete directly, have you paid attention to passing the
"nullspace=left" option ?

E.

On Mon, Aug 4, 2014 at 1:40 PM, Raphaël Rigo <ml-cado at syscall.eu> wrote:
> Hello,
> I'm trying to factor a c154 with cado-nfs.
>
> While I initialy used cadofactor.py, at some point I switched to
> manually running tools.
> bwc.pl :complete went OK.
>
> But when I try to run "characters" I get this error :
>
> characters.rd539d44 -t 1 -poly best.p -purged rsa512.purge.purged.gz
> -index rsa512.merge.index.gz -heavyblock rsa512.merge.small.dense.bin
> -nchar 50 -out out.ker -ker rsa512.merge.small.bin-2x2/W -lpbr 30 -lpba 30
> Note: total 64 characters, including 14 trivial padding characters
> Reading 18943597 (a,b) pairs from rsa512.purge.purged.gz
> Read 1024 relations in 0.0s -- 9.1 MB/s -- 80992.8 rels/s
> Read 2048 relations in 0.0s -- 17.3 MB/s -- 154043.6 rels/s
> Read 4096 relations in 0.0s -- 31.6 MB/s -- 281259.1 rels/s
> Read 8192 relations in 0.0s -- 34.7 MB/s -- 308571.4 rels/s
> Read 16384 relations in 0.0s -- 47.1 MB/s -- 418781.2 rels/s
> Read 32768 relations in 0.1s -- 58.8 MB/s -- 523074.8 rels/s
> Read 65536 relations in 0.1s -- 69.7 MB/s -- 620118.1 rels/s
> Read 131072 relations in 0.2s -- 79.5 MB/s -- 707560.1 rels/s
> Read 262144 relations in 0.3s -- 84.8 MB/s -- 754123.7 rels/s
> Read 524288 relations in 0.7s -- 89.1 MB/s -- 791917.1 rels/s
> Read 1048576 relations in 1.3s -- 92.4 MB/s -- 821132.8 rels/s
> Read 2097152 relations in 2.5s -- 95.1 MB/s -- 844060.8 rels/s
> Read 4194304 relations in 4.9s -- 96.7 MB/s -- 862620.6 rels/s
> Read 8388608 relations in 9.8s -- 95.5 MB/s -- 854676.3 rels/s
> Read 16777216 relations in 19.7s -- 95.3 MB/s -- 853704.3 rels/s
> Done: Read 18943597 relations in 22.0s -- 95.9 MB/s -- 860726.7 rels/s
> Computing 64 characters for 18943597 (a,b) pairs
> all_A freed
> all_B freed
> done building big character matrix at 337.9
> done building small character matrix at 346.8
> done reading heavy block of size 5890275 x 32 at 348.8
> rsa512.merge.small.bin-2x2/W: 64 vectors
> Total: 64 kernel vectors
> done reading 64 kernel vectors at 348.9
> Info: input kernel vectors reduced to dimension 0
> done multiplying matrices at 348.9
> Computing left nullspace of 0 x 96 matrix
> dim of ker = 0
> Error, all dependencies are zero !
>
> I must admit I'm at loss here. Did I make an error before or may it be a
> bug ?
> I tried both latest git and release 2.1. most of the work was done with
> a git version from may I think.
>
> Regards,
> Raphaël
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