[Cado-nfs-discuss] Lingen Multithreading

Pierrick Gaudry pierrick.gaudry at loria.fr
Mon Oct 27 17:36:46 CET 2014


Hi Pierpaolo!

Very good question, indeed!

But easy answer: nobody implemented a parallel version yet :-(

In fact, there are many issues with the lingen binary that was written
ages ago... This is unfortunately not a 5-minute change.

This actually bothers us very much (maybe more than it bothers you) and
is likely to be fixed in the next few months.

Regards,
Pierrick

On Mon, Oct 27, 2014 at 05:28:22PM +0100, Pierpaolo Santucci wrote:
> Hello everyone!
> 
> Using CADO-NFS 2.1.1 linear algebra without MPI with the command:
> 
> ./bwc.pl :complete thr=8 mn=64 nullspace=left interval=100
> matrix=/tmp/matrices/100.bin wdir=/tmp/wdir_8_2.1.1/100 interleaving=0
> shuffled_product=1
> 
> the lingen phase use only one CPU. It seems as if lingen was sequential.
> 
> Why?
> 
> Thanking you in advance.
> Regards,
> 
> Pierpaolo Santucci
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