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 Showing results 1 to 25 of 534 Search took 0.09 seconds. Search: Posts Made By: bur
 Forum: Software 2022-06-28, 20:00 Replies: 72 Views: 5,687 Posted By bur I run B1=3M ECM curves on expoenents around... I run B1=3M ECM curves on expoenents around 22,000. I noticed all workers use 100MB RAM for stage 2. Is there some setting that limits the usage or is that little memory required? I have:...
 Forum: PrimeNet 2022-06-28, 12:08 Replies: 2,487 Views: 307,328 Posted By bur Not sure if this is a server problem, but... Not sure if this is a server problem, but whenever I try to access anything at mersenne.org I get a 403 "forbidden" error. It happens when I tried to download the mprime.tar.gz, happens when...
 Forum: Software 2022-06-27, 12:26 Replies: 4 Views: 115 Posted By bur Ok, makes sense. I forgot that it's possible to... Ok, makes sense. I forgot that it's possible to determine whether a is a quadratic non-residue without calculating a^(p-1)/2 (mod p) at first.
 Forum: Software 2022-06-27, 11:44 Replies: 4 Views: 115 Posted By bur Thanks, so the iteration LLR performs is... Thanks, so the iteration LLR performs is calculating a(p-1)/2 (mod p)?
 Forum: Software 2022-06-27, 11:04 Replies: 4 Views: 115 Posted By bur Proth test performed by LLR According to the rieselprime.de Wiki, LLR uses the Proth's theorem to test for primality of Proth numbers, i.e. finding a number a such that a^{(p-1)/2} \equiv -1 \pmod p. To my understanding that...
 Forum: Homework Help 2022-06-24, 12:30 Replies: 4 Views: 234 Posted By bur Thanks, actually, I saw your various unique... Thanks, actually, I saw your various unique primes at Caldwell's list before, so I knew that concept, but didn't connect it to this phenomenon. In hindsight this obviously occurs for every prime...
 Forum: GPU to 72 2022-06-24, 11:23 Replies: 5,303 Sticky: GPU to 72 status... Views: 433,202 Posted By bur I don't bother with CPU-only anymore, it's very... I don't bother with CPU-only anymore, it's very slow and I hope if I don't use Colab for a while they are more lenient with handing out T4s. So far I have the sessions for about 6 hours and at...
 Forum: Homework Help 2022-06-24, 07:14 Replies: 4 Views: 234 Posted By bur Ah ok, so it's that simple... :D I was spending... Ah ok, so it's that simple... :D I was spending too much time analyzing the values of k Mod 13 and their order. Thanks.
 Forum: Homework Help 2022-06-23, 16:53 Replies: 4 Views: 234 Posted By bur Peculiar divisors of k.10^n-1 I noticed that 3 * 10^272 - 1 / 13 = 230769...23076923. This periodic appearance in base 10 shows for all exponents where the number is divisible by 13, i.e. 3 * 10^32 - 1 / 13 =...
 Forum: Miscellaneous Math 2022-06-23, 16:30 Replies: 1 Views: 66 Posted By bur Fermat numbers and primality This is misc. math, so it's just some, maybe trivial, musings and I write this down as much to my own benefit as for the chance that someone else might find it interesting. I.e., please don't expect...
 Forum: Cloud Computing 2022-06-21, 07:09 Replies: 15 Views: 1,561 Posted By bur Sorry for never getting back previously, but now... Sorry for never getting back previously, but now I'm back. :) For now I just went with a dedicated server because there are some inexpensive offers: a 12-core i9-10920X for 78€/month or a 16-core...
 Forum: Factoring 2022-06-20, 13:14 Replies: 21 Views: 1,024 Posted By bur Just copy&paste the code into GP. Then you can... Just copy&paste the code into GP. Then you can run it via omPhiSeq(n,j) where n is the first value of the sequence and j (which is optional) is the number of terms you want to calculate. For example...
 Forum: Factoring 2022-06-15, 15:50 Replies: 21 Views: 1,024 Posted By bur I somehow messed up my post, it was supposed to... I somehow messed up my post, it was supposed to quote Batalov's elegant tau(n) = #divisors(n). Some variations: Instead of tau, one could use omega, bigomega or even sigma. Or instead of...
 Forum: NFS@Home 2022-06-15, 06:52 Replies: 20 Views: 566 Posted By bur Thanks, that's what I figured, so I didn't do... Thanks, that's what I figured, so I didn't do that but just assigned cores. ETA went down for a while and now it's up again. I also tried assigning the range of physical cores, but that didn't do...
 Forum: Factoring 2022-06-14, 10:34 Replies: 21 Views: 1,024 Posted By bur I knew there'd be a simple in-house solution...... I knew there'd be a simple in-house solution... thanks.
 Forum: NFS@Home 2022-06-14, 07:01 Replies: 20 Views: 566 Posted By bur Other than MPI that would be: ... Other than MPI that would be: recompiling with VBITS=256 assigning to physical cores not use HT ? Regarding HT, if the threads aren't fully utilizing the physical cores, wouldn't that...
 Forum: NFS@Home 2022-06-13, 11:36 Replies: 20 Views: 566 Posted By bur Ok, having looked at old logs I can say this is... Ok, having looked at old logs I can say this is sub-average speed but nothing strange. A 15M matrix took 140 hours, a 13 M 130 hours. So the 800 h is fine, as I said the 7401P is not that fast. So as...
 Forum: NFS@Home 2022-06-13, 11:04 Replies: 20 Views: 566 Posted By bur I didn't know MPI even helps on one CPU, if only... I didn't know MPI even helps on one CPU, if only due to overhead. VBITS is a compiler setting? No idea about octa channel. Isn't that a hardware thing that I can't change anyway? I will leave it...
 Forum: NFS@Home 2022-06-13, 09:12 Replies: 20 Views: 566 Posted By bur found 32078384 cycles, need 31964190. I'll... found 32078384 cycles, need 31964190. I'll try that, but it's usually said that, contrary to the windows scheduler, the linux cpu scheduler does a good job and just to leave it to its own devices....
 Forum: NFS@Home 2022-06-13, 08:46 Replies: 20 Views: 566 Posted By bur So, the matrix was build successfully using... So, the matrix was build successfully using TD=130: Mon Jun 13 09:13:59 2022 matrix includes 64 packed rows Mon Jun 13 09:14:03 2022 matrix is 31962806 x 31963031 (15913.7 MB) with weight...
 Forum: Factoring 2022-06-11, 06:34 Replies: 21 Views: 1,024 Posted By bur I wrote a simple PARI script that prints the... I wrote a simple PARI script that prints the series. First parameter is the number you want to test, the second parameter is optional and sets the number of elements that are calculated. Since there...
 Forum: NFS@Home 2022-06-08, 19:49 Replies: 20 Views: 566 Posted By bur Ok, thanks. I panicked a bit... ;) Ok, thanks. I panicked a bit... ;)
 Forum: NFS@Home 2022-06-08, 17:48 Replies: 20 Views: 566 Posted By bur 5p2_950M doable on 24 cores? Somewhat embarrisingly I underestimated how different a 172 digits composite I could nicely do on a 10 core i10 incl sieving is from just the post-processing step of the 192 digits 5p2_950M. The...
 Forum: YAFU 2022-06-08, 13:52 Replies: 346 Views: 46,145 Posted By bur When I try to build yafu under Ubuntu with make... When I try to build yafu under Ubuntu with make NFS=1 USE_SSE41=1 USE_AVX=1 it quits with: gcc -g -m64 -DUSE_SSE2 -DUSE_AVX2 -DUSE_SSE41 -mavx2 -DUSE_SSE41 -msse4.1 -DUSE_NFS -O2...
 Forum: EdH 2022-06-08, 13:49 Replies: 5 Views: 1,651 Posted By bur edit: Sorry, wrong thread. edit: Sorry, wrong thread.
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