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Search: Posts Made By: fivemack
Forum: Soap Box 2021-07-24, 22:32
Replies: 81
Views: 4,636
Posted By fivemack
I don't think the fires put particles high enough...

I don't think the fires put particles high enough up into the atmosphere - there's the tropopause between the troposphere and the stratosphere, which obstructs the movement of particles either...
Forum: Aliquot Sequences 2021-07-24, 17:07
Replies: 3,528
Views: 348,948
Posted By fivemack
Take 613872 791220

Take 613872 791220
Forum: Aliquot Sequences 2021-07-24, 16:58
Replies: 3,528
Views: 348,948
Posted By fivemack
Drop 1057932 (2^2 * 3 * 19 * C140 which has...

Drop 1057932 (2^2 * 3 * 19 * C140 which has survived 7000@3e6)
Forum: Software 2021-07-16, 09:29
Replies: 36
Views: 1,082
Posted By fivemack
Yes, the normal Linux enumeration is 0 to 2N-1 as...

Yes, the normal Linux enumeration is 0 to 2N-1 as physical cores, N in each socket, and 2N to 4N-1 as the logical cores - I determined this rather tediously by running two copies of ECM at a time and...
Forum: Software 2021-07-10, 18:50
Replies: 36
Views: 1,082
Posted By fivemack
I'd be surprised if you could get anything much...

I'd be surprised if you could get anything much higher performance ... the board won't support the bizarre Platinum 92xx dual-chip packages, and the absolutely highest performance Platinum 82xx is 28...
Forum: Aliquot Sequences 2021-07-10, 09:53
Replies: 3,528
Views: 348,948
Posted By fivemack
Drop 2385042. 2^2 * C141 which has survived my...

Drop 2385042. 2^2 * C141 which has survived my usual 7000@3e6.
Forum: Software 2021-07-09, 13:59
Replies: 36
Views: 1,082
Posted By fivemack
Are these the same CPUs as...

Are these the same CPUs as https://www.ebay.co.uk/itm/154497112899 ? I was expecting there to be a catch, if they work well I'll pick myself up a pair. I've got a Supermicro Skylake system which...
Forum: Aliquot Sequences 2021-07-05, 13:38
Replies: 3,528
Views: 348,948
Posted By fivemack
Drop 995280. Driver 2*3, C148 has survived about...

Drop 995280. Driver 2*3, C148 has survived about 7000 curves at B1=3e6
Forum: Msieve 2021-06-27, 13:05
Replies: 5
Views: 332
Posted By fivemack
Well, that's not actually the cause; the vpxor...

Well, that's not actually the cause; the vpxor xmm0,xmm0,xmm0 instruction is in fact defined as clearing the top half of the register (whilst the superficially similar pxor xmm0,xmm0 is defined as...
Forum: Aliquot Sequences 2021-06-27, 09:43
Replies: 3,528
Views: 348,948
Posted By fivemack
Take 2541810

Take 2541810
Forum: Msieve 2021-06-27, 09:35
Replies: 5
Views: 332
Posted By fivemack
I am just downloading gcc-11.1 in the hope that...

I am just downloading gcc-11.1 in the hope that it will be equipped with a sufficiently heavy-duty yak razor
Forum: Msieve 2021-06-26, 22:23
Replies: 5
Views: 332
Posted By fivemack
This is driving me slightly mad: I made the...

This is driving me slightly mad: I made the obvious tweaks to use a 2-bit rather than 8-bit table, it slowed down immensely, and this was because it wasn't using YMM operations at all, rather...
Forum: Msieve 2021-06-26, 19:46
Replies: 5
Views: 332
Posted By fivemack
Profile-driven optimisation for lanczos

Has anyone got thoughts about the NxB times BxB multiply once VBITS grows big?

My profile at the moment looks like

26.39% msieve-MP-V256- msieve-MP-V256-BDW [.] mul_BxN_NxB ...
Forum: Aliquot Sequences 2021-06-26, 10:39
Replies: 3,528
Views: 348,948
Posted By fivemack
Take 1057932 1142472 2385042 2993280

Take 1057932 1142472 2385042 2993280
Forum: Aliquot Sequences 2021-06-23, 11:26
Replies: 3,528
Views: 348,948
Posted By fivemack
Drop 2327016

Drop 2327016
Forum: Aliquot Sequences 2021-06-23, 09:43
Replies: 3,528
Views: 348,948
Posted By fivemack
Take 1061748 1193460 2627844 2657424 2671548...

Take 1061748 1193460 2627844 2657424 2671548 2691360 2716542 2852412 2918496
Forum: Factoring 2021-06-21, 21:41
Replies: 413
Views: 17,017
Posted By fivemack
(1,10) done

Mon Jun 21 18:59:28 2021 p64 factor: 1338390497207220199271164911882588356198888527524342903132072077
Mon Jun 21 18:59:28 2021 p95 factor:...
Forum: Factoring 2021-06-20, 10:19
Replies: 413
Views: 17,017
Posted By fivemack
Nice work!

Nice work!
Forum: Factoring 2021-06-20, 10:14
Replies: 413
Views: 17,017
Posted By fivemack
(5,-8) C209 complete by SNFS Unspun...

(5,-8) C209 complete by SNFS

Unspun polynomial

n:...
Forum: Factoring 2021-06-16, 09:58
Replies: 413
Views: 17,017
Posted By fivemack
ETA Friday night for the 5,-8 SNFS job - getting...

ETA Friday night for the 5,-8 SNFS job - getting quite a lot of duplications, probably even this S210 I should have run with 15e.

May I take the C158/S195, I'll use the shiniest spun polynomial.
...
Forum: Factoring 2021-06-13, 09:42
Replies: 413
Views: 17,017
Posted By fivemack
This is the polynomial I used, which I found in a...

This is the polynomial I used, which I found in a few hours with a version of msieve CPU that I found under a rock (I think an x86_64 executable running on my ARM Mac)


n:...
Forum: Factoring 2021-06-12, 15:55
Replies: 413
Views: 17,017
Posted By fivemack
Nice split

C156 from line 55 splits as


p78 factor: 208030089699658289822530838465866133665512884513204464375029444713302449264703
p78 factor:...
Forum: Factoring 2021-06-11, 22:37
Replies: 413
Views: 17,017
Posted By fivemack
x^4 - 96*x^3 + 2232*x^2 - 17280*x + 32400 x^4 -...

x^4 - 96*x^3 + 2232*x^2 - 17280*x + 32400
x^4 - 24*x^3 + 288*x^2 - 4320*x + 32400
x^4 + 192*x^3 - 5544*x^2 + 34560*x + 32400


I can't help noticing that those polynomials have increasing powers...
Forum: Factoring 2021-06-11, 07:25
Replies: 413
Views: 17,017
Posted By fivemack
May I take the C209 S210 from (5,-8) on line 88?

May I take the C209 S210 from (5,-8) on line 88?
Forum: Factoring 2021-06-11, 07:20
Replies: 413
Views: 17,017
Posted By fivemack
Started 28*36 gmp-ecm curves at B1=3e8, default...

Started 28*36 gmp-ecm curves at B1=3e8, default B2 on the C253 from [8,-8].

That's going to be an extremely difficult SNFS job, my hope for finishing that corner is that ECM breaks off a piece big...
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