20220910, 06:03  #122 
"Curtis"
Feb 2005
Riverside, CA
2^{2}×3×457 Posts 
Behavior should change at higher Q; a single testpoint may mislead you, especially one chosen that makes GGNFS change alim down to 20M. Or are you sieving the rside with 3LP on the a side?
I suppose I'm a bit surprised 3LP is useful at all at this size, too. Seems I have some testing to do! 
20220910, 14:41  #123 
Sep 2008
Kansas
3682_{10} Posts 
Parameters updated and Q range lowered to 1896M
C234 from the OPN t800 file. Increasing alambda improved the yield and cut the time. 3.5 & 3.6 were pretty close until I got to higher Q, then I gained a bit of time. Code:
n: 10512896323946525328323590051713030182707488022156443686427827035707600086867033903192945127273531284579440671455984668440538086981016196248405396732898676231093060782972818311914352957505254809179243 # 34210243^311, difficulty: 233.56, skewness: 0.06, alpha: 0.00 # cost: 2.30621e+18, est. time: 1098.20 GHz days (not accurate yet!) skew: 18.02 c6: 1 c0: 34210243 Y1: 46857681410903935241309012906079659443 Y0: 1 type: snfs rlim: 67000000 alim: 67000000 lpbr: 30 lpba: 30 mfbr: 60 mfba: 87 rlambda: 2.6 alambda: 3.5 Code:
Q Yield NYld 18M 4531 4237 20M 4534 4386 50M 3207 3381 80M 2432 2813 96M 2874 2696 Last fiddled with by swellman on 20220911 at 02:49 
20220910, 16:00  #124  
Sep 2009
3×797 Posts 
Quote:
I found setting alambda to mfba/lpba+0.6 and rlambda to mfbr/lpbr+0.6 is usually close to optimum. Test sieve about 0.1 higher and lower if you want to be sure. 

20220910, 18:45  #125 
"Curtis"
Feb 2005
Riverside, CA
1010101101100_{2} Posts 
We don't need to guess, really; Charybdis has provided the formula:
mfb * log2 / log(lim), for each side. Add 0.2 (maybe 0.15) to this formula to get lambda. Note that since the logs are a ratio, it doesn't matter what base of log you use. If you choose log base 2, the formula simplifies to mfb / log_2 (lim). We use the same mfb's and lim's over and over, so there should indeed be a "normally best" choice for lambda. But rather than one a single guess for testsieving, we can use this formula to calculate what should be best, test it, and gain new best practices and new efficiencies. The bigger the job, the more thorough we should be about testsieving to select fastest parameters. Particularly on the fsmall queue, it's a scarce resource so we should take care to maximize efficiency to get more jobs through the queue. Finally, GGNFS does not sieve below the factor base bound. So, when Q is below lim on the sieving side, lim is reduced to Q+1 for that current Qrange. This means that lambda on the sieve side can be profitably set a bit higher than theory might indicate, because for small Q the lim is actually smaller than the one we plug into the above formula. So, if you testsieve only at starting Q, large lambdas look faster (this is how some regulars came to use 3.0 for lambda on the sieve side for big jobs!). Choosing a slightly smaller lambda on the sieve side will miss a few relations at small Q, but increase speed quite a lot at higher Q for a net gain in job efficiency. Last fiddled with by VBCurtis on 20220910 at 18:46 
20220918, 17:31  #126 
Jun 2012
3687_{10} Posts 
QUEUED AS 8m7_293
87,293 is a SNFS 264 composite from the HCN project now ready for sieving on 15e_small. Code:
n: 4176064904988291668319256684245334520819225751970049374156458143676426538538662977551445590104482819335306583796700863207451122460633606955455840311860352935559349870845679008170278701780721552630915396231909360854619140673310487581055982647862666927 skew: 1.0225 type: snfs size: 264 c6: 7 c0: 8 Y1: 256923577521058878088611477224235621321607 Y0: 178405961588244985132285746181186892047843328 rlim: 134000000 alim: 134000000 lpbr: 32 lpba: 32 mfbr: 94 mfba: 64 rlambda: 3.5 alambda: 2.4 Code:
MQ Norm_yield Speed (sec/rel) 30 3030 0.228 35 3286 0.229 50 3086 0.240 75 2732 0.212 100 2435 0.242 150 2232 0.305 200 1962 0.326 Last fiddled with by swellman on 20220918 at 17:42 
20220919, 01:58  #127 
"Curtis"
Feb 2005
Riverside, CA
12554_{8} Posts 
QUEUED AS 5_2_797m1
5*2^7971 is ready for esmall after a bit more than t50 ECM: Code:
n: 270433155750158790242010892459501546427209685877511991891679137291088366968633450805453957734005590934784516146721521454135745940896577442627145353523255306467821546083685971277 type: snfs skew: 0.87 c6: 5 c0: 2 Y1: 1 Y0: 10889035741470030830827987437816582766592 rlim: 67000000 alim: 50000000 lpbr: 32 lpba: 31 mfbr: 60 mfba: 59 rlambda: 2.5 alambda: 2.7 Code:
#Q=10M 4525 (0.056 sec/rel) 60 spq #Q=20M 4723 (0.060 sec/rel) 64 spq #Q=30M 4564 (0.069 sec/rel) 69 spq #Q=40M 2658 (0.074 sec/rel) 42 spq #Q=50M 3544 (0.083 sec/rel) 60 spq #Q=60M 3761 (0.083 sec/rel) 64 spq #Q=70M 2805 (0.095 sec/rel) 54 spq Last fiddled with by swellman on 20220919 at 11:08 
20220919, 18:10  #128 
Jun 2012
3·1,229 Posts 
QUEUED AS 8p7_293
8+7,293 is a SNFS 264 composite from the HCN project now ready for sieving on 15e_small. Code:
n: 1967645418902556993102340205275509177859691737980577693407882376486262548443738138144152558845475959819652761346438786973419287261202756248682338401729752076187830692977934455064562990990335070041661615644737980618799654264668976711817488334888088498029513 skew: 1.0225 type: snfs size: 264 c6: 7 c0: 8 Y1: 256923577521058878088611477224235621321607 Y0: 178405961588244985132285746181186892047843328 rlim: 134000000 alim: 134000000 lpbr: 32 lpba: 32 mfbr: 94 mfba: 64 rlambda: 3.5 alambda: 2.4 Code:
MQ Norm_yield 35 3755 50 3571 75 3229 100 2807 150 2615 200 2242 Last fiddled with by swellman on 20220919 at 19:17 
20220922, 23:06  #129 
May 2009
Moscow, Russia
3·941 Posts 
QUEUED AS C168_159978_11480
C168 from 159978:i11480 for 15e_small queue: Code:
n: 479997675371566508012116397954554151185920157133785715995605902715734356071413419630755029113057569989638996427419445937752909467028151487665362583627381236587716882241 # norm 2.561883e16 alpha 8.506202 e 4.441e13 rroots 5 skew: 105355368.15 c0: 3244787399662329815032658475396031643546363 c1: 1938884008252625169236175878029579329 c2: 68628897256567631078463320677 c3: 521359176148822777161 c4: 5409824979674 c5: 12792 Y0: 518632982182829025328913494470354 Y1: 65478461370689297 rlim: 67000000 alim: 67000000 lpbr: 30 lpba: 30 mfbr: 60 mfba: 60 rlambda: 2.6 alambda: 2.6 type: gnfs lss: 0 Last fiddled with by swellman on 20220923 at 00:03 
20220923, 10:35  #130 
Sep 2008
Kansas
2×7×263 Posts 
QUEUED AS 62478139_29m1
C205 from the OPN t800 file. Code:
n: 4487849528849322742479423745168653711324738985774913403224381060832884261299856002696991515300078883810194269384816276032531675031611350339460955093377981887727976150814972271321220207483134545019447746679 # 62478139^291, difficulty: 233.87, skewness: 19.92, alpha: 0.00 # cost: 2.36433e+18, est. time: 1125.87 GHz days (not accurate yet!) skew: 19.920 c6: 1 c0: 62478139 Y1: 1 Y0: 952007620815896289237318398880046834699 type: snfs rlim: 134000000 alim: 134000000 lpbr: 31 lpba: 31 mfbr: 62 mfba: 90 rlambda: 2.7 alambda: 3.4 Code:
Q Yield NYld 20M 8004 7742 60M 5877 6133 100M 5238 5170 Last fiddled with by swellman on 20220923 at 13:34 
20220928, 22:32  #131 
Sep 2008
Kansas
2·7·263 Posts 
QUEUED AS 177__227_5m1_2 on 15e_small C193 from the OPN t800 file. Code:
n: 4274594826568614723593930959135796200110466876118853098160362588328709964195214156563279817414634091541337984597138174381423495330370822349670629349298241613601983274066286183455653260622286221 # 17711138627434147625517360826415227976641556334393747227^51, difficulty: 220.99, skewness: 1.00, alpha: 1.45 # cost: 8.34884e+17, est. time: 397.56 GHz days (not accurate yet!) skew: 1.000 c4: 1 c3: 1 c2: 1 c1: 1 c0: 1 Y1: 1 Y0: 17711138627434147625517360826415227976641556334393747227 type: snfs rlim: 67000000 alim: 67000000 lpbr: 31 lpba: 31 mfbr: 90 mfba: 62 rlambda: 3.5 alambda: 2.7 Code:
Q Yield NYld 20M 6780 6558 60M 8695 9074 80M 7327 8475 96M 9216 8645 Last fiddled with by swellman on 20220929 at 00:10 
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