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Forum: And now for something completely different 2022-07-01, 11:02
Replies: 183
Views: 11,139
Posted By bur
Thanks! I can sort of follow the wikipedia...

Thanks! I can sort of follow the wikipedia article on ECPP. The "trial division" from the output relates to finding a prime factor q of m?

I don't really see why the number of bits reduces, that...
Forum: And now for something completely different 2022-07-01, 09:35
Replies: 183
Views: 11,139
Posted By bur
Sorry, if I'm being dense, but where do I find...

Sorry, if I'm being dense, but where do I find the current number of bits in the output?

I was hoping someone would feed me a simplyfied version ;) I'll try and understand the general concept and...
Forum: And now for something completely different 2022-07-01, 05:50
Replies: 183
Views: 11,139
Posted By bur
Thanks, I'd have assumed it'd be along...

Thanks, I'd have assumed it'd be along O(log(n)^2) like, afair, NFS factoring and LLR testing is. Generally, what I was after though, is it possible to say which value these parameters qroot/etc....
Forum: And now for something completely different 2022-06-30, 11:22
Replies: 183
Views: 11,139
Posted By bur
A question regarding the progress with the -v...

A question regarding the progress with the -v switch, I noticed values like qroot, Cornacchia and trial div increase over time, are those the values to look out for? If so, up to which value will...
Forum: And now for something completely different 2022-06-30, 08:13
Replies: 183
Views: 11,139
Posted By bur
Thanks, I did ldconfig which fixed it.

Thanks, I did ldconfig which fixed it.
Forum: And now for something completely different 2022-06-30, 07:58
Replies: 183
Views: 11,139
Posted By bur
edit: running sudo ldconfig solved the issue...

edit: running sudo ldconfig solved the issue...
Forum: Software 2022-06-29, 20:43
Replies: 76
Views: 5,891
Posted By bur
It's one core per worker, average utilization...

It's one core per worker, average utilization when using 11 workers and thus cores is 11.1x on htop, so it seems to use more or less 100% of a core all the time.

With gmp-ecm I have much smaller...
Forum: Software 2022-06-29, 06:06
Replies: 76
Views: 5,891
Posted By bur
Ok, thanks. I like the ease of having just one...

Ok, thanks. I like the ease of having just one program work at it, but if it speeds things up considerably. I also noticed, that when yafu/gmp-ecm is running, the CPU gets close to 80 °C and most...
Forum: Software 2022-06-28, 20:00
Replies: 76
Views: 5,891
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: 307,854
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: 126
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: 126
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: 126
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: 6
Views: 452
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
Views: 433,770
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: 6
Views: 452
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: 6
Views: 452
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: 74
Posted By bur
Arrow 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: 1,577
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: 1,040
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: 1,040
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: 577
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: 1,040
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: 577
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: 577
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...
Showing results 1 to 25 of 542

 
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