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Old 2020-10-07, 01:47   #128
charybdis
 
Apr 2020

2·5·19 Posts
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c184 32/32 run: sieving 30M-205M took 112M CPU-seconds and gave

Code:
Tue Oct  6 23:43:20 2020  Msieve v. 1.54 (SVN 1030M)
Tue Oct  6 23:43:20 2020  random seeds: 7a19fd23 910545fb
Tue Oct  6 23:43:20 2020  factoring 1926769016895629095108654427662805571730828819453815038321063771589859906145101426691203081858286347255498278743308679252628417992530572751984914065156690326565318892677376743855798161 (184 digits)
Tue Oct  6 23:43:20 2020  searching for 15-digit factors
Tue Oct  6 23:43:20 2020  commencing number field sieve (184-digit input)
Tue Oct  6 23:43:20 2020  R0: -232800310647131682476873772810105422
Tue Oct  6 23:43:20 2020  R1: 90317080737385565963549
Tue Oct  6 23:43:20 2020  A0: 2439943766309753461417671509774240145609855
Tue Oct  6 23:43:20 2020  A1: 3109448214836060753130916105182937413
Tue Oct  6 23:43:20 2020  A2: -51506391362834289409336135888
Tue Oct  6 23:43:20 2020  A3: -20569441357157925834233
Tue Oct  6 23:43:20 2020  A4: 80188144206473
Tue Oct  6 23:43:20 2020  A5: 2817780
Tue Oct  6 23:43:20 2020  skew 20877130.61, size 5.540e-18, alpha -6.572, combined = 4.934e-14 rroots = 5
Tue Oct  6 23:43:20 2020  
Tue Oct  6 23:43:20 2020  commencing relation filtering
Tue Oct  6 23:43:20 2020  setting target matrix density to 110.0
Tue Oct  6 23:43:20 2020  estimated available RAM is 15845.8 MB
Tue Oct  6 23:43:20 2020  commencing duplicate removal, pass 1
Wed Oct  7 00:24:51 2020  found 114260066 hash collisions in 416382602 relations
Wed Oct  7 00:25:13 2020  commencing duplicate removal, pass 2
Wed Oct  7 00:33:42 2020  found 132138239 duplicates and 284244363 unique relations
Wed Oct  7 00:33:42 2020  memory use: 2387.0 MB
Wed Oct  7 00:33:42 2020  reading ideals above 205193216
Wed Oct  7 00:33:42 2020  commencing singleton removal, initial pass
Wed Oct  7 00:55:32 2020  memory use: 6024.0 MB
Wed Oct  7 00:55:33 2020  reading all ideals from disk
Wed Oct  7 00:56:13 2020  memory use: 5093.3 MB
Wed Oct  7 00:56:21 2020  commencing in-memory singleton removal
Wed Oct  7 00:56:29 2020  begin with 284244363 relations and 262016506 unique ideals
...
Wed Oct  7 02:25:05 2020  matrix is 20333308 x 20333533 (8742.9 MB) with weight 2327221335 (114.45/col)
Wed Oct  7 02:25:05 2020  sparse part has weight 2088575957 (102.72/col)
Wed Oct  7 02:25:05 2020  using block size 8192 and superblock size 884736 for processor cache size 9216 kB
Wed Oct  7 02:26:04 2020  commencing Lanczos iteration (6 threads)
Wed Oct  7 02:26:04 2020  memory use: 8351.8 MB
Wed Oct  7 02:27:01 2020  linear algebra at 0.0%, ETA 204h37m
Duplication rate is more normal after the anomalous poly on the previous job, but 32/32 still looks like a win: compared to the last 31/32 job, sieving ran just a couple percent slower despite the poly scoring 12% worse. Even if we insist on a bit of oversieving with 32/32 to compensate for the larger matrices, that should only add a few more percent to the sieving time.

I suppose there's a chance 32/32 is already better at c180, so I ought to test that at some point. For now, though, the mfb bounds could do with some experimentation.
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