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Search: Posts Made By: bur
Forum: Homework Help 2022-06-24, 12:30
Replies: 4
Views: 181
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: 432,707
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: 181
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: 181
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: 61
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: 1,548
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: 20
Views: 982
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: 20
Views: 982
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: 557
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: 20
Views: 982
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: 557
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: 557
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: 557
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: 557
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: 557
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: 20
Views: 982
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: 557
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: 557
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: 45,948
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: 1,644
Posted By bur
edit: Sorry, wrong thread.

edit: Sorry, wrong thread.
Forum: Factoring 2022-06-07, 14:56
Replies: 68
Views: 1,359
Posted By bur
As R.D. Silverman and kriesel kindly pointed out...

As R.D. Silverman and kriesel kindly pointed out I made some annoying errors in my post above, of course not sigma has to be smooth but the group order.

Thanks for the explanations, I finally...
Forum: Factoring 2022-06-07, 11:09
Replies: 68
Views: 1,359
Posted By bur
edit: Sorry, I thought my edit was fast enough....

edit: Sorry, I thought my edit was fast enough. It wasn't, so retina's reply is to the original version.


Thinking about the group order, I think a factor does not "have a sigma". It is just that...
Forum: Factoring 2022-06-06, 06:11
Replies: 68
Views: 1,359
Posted By bur
edit: Took to long pondering over the post... ...

edit: Took to long pondering over the post...



What do you mean by "running ECM"? Make sure you don't replicate all the lower B1 values, chances of finding a factor are miniscule once a lot of...
Forum: NFS@Home 2022-06-05, 06:55
Replies: 62
Views: 4,225
Posted By bur
Reserving 5p2_950M

Reserving 5p2_950M
Forum: NFS@Home 2022-06-04, 05:27
Replies: 3
Views: 225
Posted By bur
Thanks!

Thanks!
Showing results 1 to 25 of 529

 
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