20210921, 19:02  #3114  
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2^{2}·3·797 Posts 
Quote:
For smaller numbers/projects, it is very difficult to hit the exact cusp, so the usual rule of thumb for automatic scripts is "if you got the matrix, don't try to sieve extra  it will be a wash" (given that filtering itself is an overhead and together with sieving some more  you will not get any time savings). but for large projects, there can be a huge difference. One could check logs that are kept in NFS @ Home collection, while binning for similar size, and very rarely you would see that the runner get a very large matrix and still decides to go along with it, and that's of course a fine personal preference. It depends on resources available to the runner; sometimes it is  optimizing for their own. human time, and sometimes it is the external resources (at the expense of human time for doing filtering twice or more). Many logs (very educationally!) keep several recordings of filtering. 

20210921, 19:10  #3115  
Jun 2012
Boulder, CO
2·7·23 Posts 
Quote:
In any case, I now have a filtering run going with target_density=130 and 2.024B uniques. If this succeeds, I will hopefully be able to hand it off for frmky for LA. 

20210923, 16:09  #3116 
Jun 2012
Boulder, CO
2·7·23 Posts 
Update: with 2.024B uniques and target_density=130, msieve produces a 133.3M x 133.3M matrix:
Code:
Wed Sep 22 18:39:19 2021 commencing 2way merge Wed Sep 22 18:43:22 2021 reduce to 304431703 relation sets and 296088199 unique ideals Wed Sep 22 18:43:22 2021 commencing full merge Wed Sep 22 20:02:23 2021 memory use: 32549.0 MB Wed Sep 22 20:02:54 2021 found 134281671 cycles, need 133304399 Wed Sep 22 20:03:51 2021 weight of 133304399 cycles is about 17329637475 (130.00/cycle) Wed Sep 22 20:03:51 2021 distribution of cycle lengths: Wed Sep 22 20:03:51 2021 1 relations: 4545972 Wed Sep 22 20:03:51 2021 2 relations: 7597027 Wed Sep 22 20:03:51 2021 3 relations: 9794025 Wed Sep 22 20:03:51 2021 4 relations: 10584633 Wed Sep 22 20:03:51 2021 5 relations: 11171953 Wed Sep 22 20:03:51 2021 6 relations: 11129931 Wed Sep 22 20:03:51 2021 7 relations: 10851523 Wed Sep 22 20:03:51 2021 8 relations: 10319041 Wed Sep 22 20:03:51 2021 9 relations: 9582186 Wed Sep 22 20:03:51 2021 10+ relations: 47728108 Wed Sep 22 20:03:51 2021 heaviest cycle: 25 relations Wed Sep 22 20:04:20 2021 commencing cycle optimization 
20211001, 21:08  #3117 
Jun 2012
Boulder, CO
2×7×23 Posts 
frmky reports that this is now in LA on a multiGPU system, with ~170 hours to go, plus or minus some time depending on his cluster's queueing.

20211002, 16:42  #3118 
Aug 2020
79*6581e4;3*2539e3
3·7·19 Posts 
Nice, let's hope the 7 will vanish....

20211002, 17:08  #3119 
Apr 2020
2×3×83 Posts 
It can't  the 2^2 guarantees sigma(n) is divisible by sigma(2^2) = 7, so the next term which is sigma(n)n will also be divisible by 7. Similarly the 7 means that sigma(n) will be divisible by 8, so the next term will also have exactly two factors of 2.
To get rid of the 2^2*7 we would need a term where the 7 is raised to an even power and the remaining prime factors contribute at most two factors of 2 to sigma(n). 
20211004, 07:44  #3120  
Jul 2003
So Cal
100010001100_{2} Posts 
Quote:
Code:
linear algebra completed 103057 of 127518005 dimensions (0.1%, ETA 75h33m) 

20211004, 12:22  #3121  
Jun 2012
Boulder, CO
142_{16} Posts 
Quote:
How's the other run progressing? 

20211004, 18:44  #3122 
Jul 2003
So Cal
2^{2}·547 Posts 

20211004, 22:45  #3123 
"Curtis"
Feb 2005
Riverside, CA
3^{3}×5×37 Posts 
Ryan
Now that sieving was shut down, do you have even a rough guess for Qrange that was sieved? Or the number of raw relations? It's nice to have confirmation that 2G uniques was enough for this job; that means we can go 35/35 and still use msieve for a future C22x GNFS job. Also, did you do any A=32 sieving, or all I=16 (same as A=31)? Last fiddled with by VBCurtis on 20211004 at 22:45 
20211005, 12:40  #3124  
Jun 2012
Boulder, CO
2·7·23 Posts 
Quote:
My methodology is essentially: fire off a large number of CADO jobs with different q ranges in parallel, then periodically gather the gzipped files, concatenate and remdups4 the merged file, and try an msieve run. Then wait a few hours and repeat. Unfortunately, I don't have the logs of the remdups4 output now. 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Reserved for MF  Sequence 276  kar_bon  Aliquot Sequences  133  20211016 17:21 
Reserved for MF  Sequence 3408  RichD  Aliquot Sequences  476  20211004 20:47 
Reserved for MF  Sequence 3366  RichD  Aliquot Sequences  524  20210906 21:00 
Assignments are reserved but not showing up  prism019  GPU to 72  6  20200921 22:11 
80M to 64 bits ... but not really reserved  petrw1  Lone Mersenne Hunters  82  20100111 01:57 