[Cado-nfs-discuss] C180 Issues

ROBERT DUCHATEAU rjd1212 at cox.net
Fri Mar 9 00:40:01 CET 2018

Dear Paul,

Here are the results of the c180.merge.stdout.1file on git revision 23930bb

Total number of merges: 77037494
Total number of removed columns: 77037498
Final matrix has N=21924168 nc=21924008 (160) W=3727108580 W*N=8.17e+16 W/N=170.00
Total merge time: 13603.77 seconds
Total usage: time 13604s (cpu), 11870s (wct) ; memory 58804M, peak 64849M

I'm glad I upgraded my RAM :-)

Best regards,


> On March 7, 2018 at 2:55 AM paul zimmermann <Paul.Zimmermann at inria.fr> wrote:
> Dear Robert,
> about issue 1), there is not much we can do without the log file.
> I am currently factoring a c180 with git revision 80885c6, and the
> c180.merge.stdout.1 file ends with:
> Final matrix has N=28030179 nc=28030019 (160) W=4765130522 W*N=1.34e+17 W/N=170.00
> Total merge time: 39073.14 seconds
> Total usage: time 39073s (cpu), 35270s (wct) ; memory 21240M, peak 42209M
> thus it should fit into 64GB.
> About issue 2), this is normal. What happens is that the bkmult parameter is
> dynamically adjusted if too small. Maybe the warning message is too verbose.
> Best regards,
> Paul Zimmermann
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