Discussion related to cado-nfs

[Paul Zimmermann <Paul.Zimmermann@inria.fr>]

       Hi Markus,

the message says the row number is not less than the initial number of rows, 
as it should be.
Something strange happened. Please can you retry the purge command with -t 1 
instead of -t 32?

Paul

> Date: Mon, 23 Sep 2024 17:39:00 +0200
> From: Markus Tervooren <mail@markustervooren.de>
> 
> 
> [1:multipart/mixed Hide]
> 
> 
> [1/1:multipart/alternative Hide]
> 
> 
> [1/1/1:text/plain Show]
> 
> 
> [1/1/2:text/html Hide Save:noname (2kB)]
> 
> Hello, 
> I'm working on a C210 GNFS using cado-nfs.
> Its a degree 5 poly, -lpb0 34 -lpb1 34 -mfb0 86 -mfb1 96
> 
> There are 1.4B relations total, after dup2 914300734 unique relations 
> remained.
> 
> The command
> cado-nfs/build/s138/filter/purge -out purged.gz -nrels 914300734 -keep 180 
> -col-min-index 254759 -
> col-max-index 1425867903 -t 32 -required_excess 0.08 dup/0/* dup/1/* 
> c210.freerel.gz
> 
> gives me this error:
> # Read 905969664 relations in 1048.8s -- 116.2 MB/s -- 863810.2 rels/s 
> code BUG() : condition rel->num < mat->nrows_init failed in 
> purge_matrix_set_row_from_rel at
> /home/user/cado-nfs/filter/purge_matrix.c:104 -- Abort
> Aborted (core dumped)
> 
> What is the issue here? msieve is able to build a matrix with this many 
> relations already.
> 
> Latest version from git, commit 9f5554bf4
> 
> n:
> 232539157261042927881941676700725188228402020535267578693205299222661644763153066254774144628187108856923616820700724331104086289032277131880916986179638998110405195457189932507201286650867813828838811210697271
> 
> skew: 16165690.452
> c0: -5395806944141178587689202753640560650628373335
> c1: 2035537653573416150928264387299885237521
> c2: 1346760344216313548930876980069067
> c3: -25448763348639172649664385
> c4: -2620291387764513348
> c5: -20686222800
> Y0: -15630706117797680537240315141285747058132
> Y1: 1083090829201407068911
> # MurphyE (Bf=1.718e+10,Bg=1.718e+10,area=5.369e+16) = 6.196e-09
> 
> Thank you 
> [2:application/pgp-signature Show Save:OpenPGP_signature.asc (840B)]
>