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Forum: CADO-NFS 2022-08-11, 13:42
Replies: 99
Views: 24,134
Posted By bur
Thanks, that sounds very promising. I did a C153...

Thanks, that sounds very promising. I did a C153 with stock CADO parameters so I could compare the times.

Btw, has it ever been considered to share these findings with the CADO team or generally...
Forum: CADO-NFS 2022-08-10, 05:58
Replies: 99
Views: 24,134
Posted By bur
Have you ever posted a draft for C155? I thought...

Have you ever posted a draft for C155? I thought so, but now I can't find it. Thanks.
Forum: And now for something completely different 2022-08-09, 12:16
Replies: 172
Views: 38,005
Posted By bur
Very true, my contract was up for renewal and...

Very true, my contract was up for renewal and shot up to 36 c/kWh... A 200 W computer is now 50€/month just in electricity.

Fortunately for some reason the dedicated server I use (located in...
Forum: NFS@Home 2022-08-09, 06:32
Replies: 103
Views: 5,877
Posted By bur
Ah, thanks. Then it makes sense that increasing...

Ah, thanks. Then it makes sense that increasing lpb by 1 doubles the number of required relations.
Forum: NFS@Home 2022-08-09, 06:29
Replies: 107
Views: 9,240
Posted By bur
Interesting look into the History of Aliquots. :)...

Interesting look into the History of Aliquots. :)



Let's see what the factorization will yield, just as likely it'll hit another C170+ immediately.
Forum: Aliquot Sequences 2022-08-08, 08:22
Replies: 158
Views: 53,689
Posted By bur
If this situation requires more sieving, I'd...

If this situation requires more sieving, I'd assume we have more distinct prime factors (or ideals actually?) than relations? But then why is it called overdetermined? That to me sounds like having...
Forum: NFS@Home 2022-08-08, 06:13
Replies: 107
Views: 9,240
Posted By bur
Ok, I was also wondering who could continue on...

Ok, I was also wondering who could continue on that sequence. Doing the post processing is just a small contribution after all and I didn't want to "steal" the sequence from anyone. But then I'll...
Forum: NFS@Home 2022-08-08, 05:58
Replies: 103
Views: 5,877
Posted By bur
I see, so a lower lpb results in fewer relations...

I see, so a lower lpb results in fewer relations to be found, but they are more "useful"?

The latter would be due to there being fewer unknowns in the LA problem?
Forum: NFS@Home 2022-08-07, 07:21
Replies: 103
Views: 5,877
Posted By bur
That seems so low to me. A GNFS 160 takes about...

That seems so low to me. A GNFS 160 takes about 160M raw relations, a GFNS 165 takes about 220 M when I do it with CADO using Curtis' optimized parameters. Is this a result of using very different...
Forum: NFS@Home 2022-08-04, 10:35
Replies: 3
Views: 133
Posted By bur
Thanks, I'll give it a try.

Thanks, I'll give it a try.
Forum: NFS@Home 2022-08-04, 08:55
Replies: 107
Views: 9,240
Posted By bur
Taking C175_3408_1723 What is the protocol...

Taking C175_3408_1723

What is the protocol once factors are obtained, should I just put them into factordb? I know some people don't do that in case it results in a downdriver.
Forum: NFS@Home 2022-08-04, 07:48
Replies: 103
Views: 6,499
Posted By bur
Default TD is 90. True, target density does...

Default TD is 90.

True, target density does have an effect, albeit not very much for smaller numbers. In case of this 19M matrix the difference between 90 and 120 was around 4% lower ETA which is...
Forum: NFS@Home 2022-08-04, 07:42
Replies: 103
Views: 6,499
Posted By bur
9p8_277 is done. p71 factor: ...

9p8_277 is done.

p71 factor:
15049216317836517294600907995288190450795051840238103964985359740395657
p169 factor:...
Forum: NFS@Home 2022-08-03, 13:00
Replies: 3
Views: 133
Posted By bur
Colab for linear algebra?

GPU72 has a very easy to use script to trial factor using Colab's free Tesla T4's (16 GB RAM). I was wondering if this couldn't be used for linear algebra. I usually get about 3 hours at least once...
Forum: Proth Prime Search 2022-08-02, 06:25
Replies: 16
Views: 2,979
Posted By bur
Cool, when I saw that prime on UTM I suspected it...

Cool, when I saw that prime on UTM I suspected it came from this search ;)


19061965*2^19061965+1 is divisible by 3, but maybe the Woodall counterpart works out...
Forum: mersenne.ca 2022-07-28, 09:53
Replies: 50
Views: 2,118
Posted By bur
Is it possible to lookup where the factorization...

Is it possible to lookup where the factorization is used, e.g. which k? I never saw an entry where k wasn't factored, I'm curious.

Also, what other use is there besides factoring k?
Forum: Factoring 2022-07-28, 06:58
Replies: 64
Views: 8,497
Posted By bur
Thanks a lot guys, I was always wondering how...

Thanks a lot guys, I was always wondering how exactly the rational and algebraic polynomials were combined to yield kN.
Forum: NFS@Home 2022-07-28, 06:55
Replies: 103
Views: 6,499
Posted By bur
Regarding TD and its influence on the matrix. I...

Regarding TD and its influence on the matrix. I accidentally omitted the TD option when doing 9p8_277 so I can compare the default, I think it's 90, and TD 120.

TD default: 21001871 x 21002097...
Forum: Msieve 2022-07-27, 05:56
Replies: 10
Views: 255
Posted By bur
It has mpi support, when I messed up the command...

It has mpi support, when I messed up the command line, there was an error message by MPI saying a process died or something. So that seems to be ok.

Is it expected that all status messages from...
Forum: Factoring 2022-07-26, 19:43
Replies: 64
Views: 8,497
Posted By bur
How are the polynomials for HCN constructed? For...

How are the polynomials for HCN constructed? For example 9^277 + 8^277, it has the polynomial:

c6: 9
c0: 8
Y1: -348449143727040986586495598010130648530944
Y0:...
Forum: CADO-NFS 2022-07-26, 16:59
Replies: 2
Views: 376
Posted By bur
I assume it's the same, -t is from the readme. ...

I assume it's the same, -t is from the readme.


Because I don't understand the option... I just took it from params.c90 to see if it would change anything. Then I'd have investigated further.
Forum: Msieve 2022-07-26, 15:00
Replies: 10
Views: 255
Posted By bur
Thanks, I'll use that!

Thanks, I'll use that!
Forum: Msieve 2022-07-26, 14:09
Replies: 10
Views: 255
Posted By bur
Ok, thanks. I read occasionally that MPI might be...

Ok, thanks. I read occasionally that MPI might be of advantage even for single machines, but maybe that referred exclusively to multi-socket ones.

So I won't do the -nc2 step with MPI, but I think...
Forum: CADO-NFS 2022-07-26, 13:54
Replies: 2
Views: 376
Posted By bur
Linear algebra using all available cores

I recently installed a fresh copy of CADO and it uses all available cores (including logical cores) for the LA step. Since it's a smaller number I simply ran ./cado-nfs.py $a -t 10.

I tried -t 10,...
Forum: Msieve 2022-07-26, 09:55
Replies: 10
Views: 255
Posted By bur
MPI and msieve

I wanted to give MPI a try for msieve.

First off, is it even worth the effort for a single-socket 12-core system?

If so, I saw that usually people run with a command line similar to mpirun -np...
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