Discussion related to cado-nfs

[Elena Wilson <elena225318@gmail.com>]

Hi everybody,

The noticeable differences between cado-nfs-2.3.0 and cado-nfs-master are as follows:

- Using batch smoothness detection in sieving

- Parallelizing the "merge" step in filtering

- Parallelizing the "lingen" step in linear algebra 

However, after running the cado-nfs-master, sieving of the cado-nfs-master took a longer time than the sieving of the cado-nfs.2.3.0.

The comparison is done under the same setup with c120.params included in the master version:

#####################################################################
# Sieve
#####################################################################
tasks.lim0 = 3000000
tasks.lim1 = 5500000
tasks.lpb0 = 27
tasks.lpb1 = 27
tasks.sieve.mfb0 = 54
tasks.sieve.mfb1 = 54
tasks.sieve.ncurves0 = 14
tasks.sieve.ncurves1 = 19
tasks.I = 12
tasks.qmin = 1000000
tasks.sieve.qrange = 10000
# with that value, most factorizations will need only one filtering attempt
tasks.sieve.rels_wanted = 13419694
#####################################################################

For example, here is the result of sieving at interval 4000000-4010000:

cado-nfs-2.3.0:

32674 reports

elapsed time = 549.45 s

PeakMemusage = 2805 MB

cado-nfs-master:

32664 reports

elapsed time = 355.6

PeakMemusage = 261 MB

Can you please explain what is wrong with this comparison?

Thank you,

Elena