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Forum: Math 2021-09-25, 22:40
Replies: 8
Views: 244
Posted By kriesel
PRP is fast in large part because we only need to...

PRP is fast in large part because we only need to do it once per exponent. The VDF based proof generation allows verification of correct completion for additional effort that's a fraction of a...
Forum: GpuOwl 2021-09-25, 20:38
Replies: 5
Views: 75
Posted By kriesel
Good. One thing in favor of V7.x P-1 is...

Good.
One thing in favor of V7.x P-1 is superior error detection.
1) It saves powers of 3 produced during PRP/GEC, for use in generating the P-1 stage 1 power of 3. Generation of those individual...
Forum: Lounge 2021-09-25, 18:46
Replies: 20
Views: 387
Posted By kriesel
Thx. That firm's in Texas. Regs vary by state. I...

Thx. That firm's in Texas. Regs vary by state. I have a little array on my deck, but it's an isolated 12Vdc system. Does an ok job of providing a bit of direct DC lighting, spare battery charging, or...
Forum: Math 2021-09-25, 18:32
Replies: 8
Views: 244
Posted By kriesel
(FTFY) PRP+proof ~1.01 test effort and high...

(FTFY)
PRP+proof ~1.01 test effort and high certainty of correctness.
LL & LL DC & ~4% LL TC ~2.04 test effort at wavefront. 2.04/1.01 >2. And PRP/GEC/proof gets more advantageous at higher...
Forum: GpuOwl 2021-09-25, 18:13
Replies: 5
Views: 75
Posted By kriesel
Right. In V7.x you'd have to give bounds with a...

Right. In V7.x you'd have to give bounds with a PRP worktodo line, then kill the run after P-1 stage 2 finishes. (Possibly you could use -iters if that worked. I vaguely recall trying that -iters...
Forum: Lounge 2021-09-25, 17:51
Replies: 20
Views: 387
Posted By kriesel
I recently looked at what would be involved in...

I recently looked at what would be involved in getting a rooftop solar array approved and installed. The regs (https://docs.legis.wisconsin.gov/code/admin_code/psc/119.pdf) here require approval of...
Forum: Lounge 2021-09-25, 17:06
Replies: 20
Views: 387
Posted By kriesel
Who's selling such hardware? I've never seen that.

Who's selling such hardware? I've never seen that.
Forum: GpuOwl 2021-09-25, 16:53
Replies: 5
Views: 75
Posted By kriesel
Yes. V6.11-380 or somewhat earlier. If you don't...

Yes. V6.11-380 or somewhat earlier. If you don't specify bounds somehow, it will default to B1=1M, B2=30M. Worktodo entry formats here...
Forum: Marin's Mersenne-aries 2021-09-25, 14:02
Replies: 70
Views: 4,963
Posted By kriesel
12

12 (11 DC 1 cert) remain; 57760333 completed; smallest remaining delta 582, average 12905.
Forum: Marin's Mersenne-aries 2021-09-25, 12:38
Replies: 70
Views: 4,963
Posted By kriesel
13

12 DC to finish, and a cert. Certs typically complete within a day. One DC is a bit overdue for expiration and reassignment. The other 11 DC are all recently reassigned to Cat0-qualified fast...
Forum: Marin's Mersenne-aries 2021-09-24, 22:54
Replies: 70
Views: 4,963
Posted By kriesel
14

57747401 done, lowest remaining unchanged. A fine example of how lowest remaining does not always reflect progress well, sometimes not at all. Smallest remaining delta just jumped from 32 to 340.
Forum: Science & Technology 2021-09-24, 22:42
Replies: 249
Views: 20,064
Posted By kriesel
Hoping for a good outcome, Chris. I recently...

Hoping for a good outcome, Chris.

I recently heard from someone who I've not seen in person for over a year, that despite his wife's expressed concerns, he and the rest of the band got together to...
Forum: Marin's Mersenne-aries 2021-09-24, 17:58
Replies: 70
Views: 4,963
Posted By kriesel
15 left

and M57747401 likely to complete within a day.
Get ready to celebrate.
Forum: Marin's Mersenne-aries 2021-09-24, 14:29
Replies: 70
Views: 4,963
Posted By kriesel
Correct. Jacobi symbol ...

Correct. Jacobi symbol (https://en.wikipedia.org/wiki/Jacobi_symbol)check is done infrequently, only ~twice a day because it is computationally costly. Its detection rate is only ~50% of errors. If...
Forum: Lounge 2021-09-24, 10:47
Replies: 20
Views: 387
Posted By kriesel
US by-state incremental US$/KWHR figures vary...

US by-state incremental US$/KWHR figures vary widely, from under $0.10 Idaho to over $0.327 Hawaii.
Change over a year from -5% Idaho to +20% Louisiana.
0.25GBP/kwhr x1.37 = US$0.3425/kwhr,...
Forum: Marin's Mersenne-aries 2021-09-24, 02:03
Replies: 70
Views: 4,963
Posted By kriesel
required reading...

required reading (https://www.mersenneforum.org/showpost.php?p=533167&postcount=5)
Forum: kriesel 2021-09-24, 00:03
Replies: 22
Views: 8,147
Posted By kriesel
Why don't we compute GCD for a P-1 stage in parallel with the next stage or assignment?

See discussion beginning at https://mersenneforum.org/showpost.php?p=588492&postcount=439

Most computations are being done multicore at this point, in prime95 / mprime and Mlucas. P-1 GCD is an...
Forum: Software 2021-09-23, 19:59
Replies: 446
Views: 46,830
Posted By kriesel
Assuming the ~p2.1 scaling also applies to GCD...

Assuming the ~p2.1 scaling also applies to GCD operations, and you're doing ~106M P-1, there's a factor of ~4.2 unexplained difference in GCD speed in your favor. Maybe faster cores giving faster...
Forum: Software 2021-09-23, 19:12
Replies: 446
Views: 46,830
Posted By kriesel
Let's ballpark these for ppm of system...

Let's ballpark these for ppm of system productivity.

P-1 GCD 1 hour at 880M on Xeon Phi 7210. I have another similar-exponent P-1 that's projecting a week left to go for about half of stage 2. So...
Forum: Software 2021-09-23, 18:20
Replies: 446
Views: 46,830
Posted By kriesel
Except when they're free. George does what he...

Except when they're free. George does what he does not for the money.

After watching George deliver very well for a quarter century, it seems clear to me he's up to the task. Multiple workers...
Forum: Software 2021-09-23, 17:55
Replies: 446
Views: 46,830
Posted By kriesel
prime95 idles lots of cores on a worker during P-1 GCD

See attachment. Same will apply to dual-manycore-Xeons and some other configurations.
P-1 during GCD idles all but 1 core of a worker. On a Xeon Phi this may be 64/n -1 or 68/n -1 cores, where n is...
Forum: Marin's Mersenne-aries 2021-09-23, 14:42
Replies: 70
Views: 4,963
Posted By kriesel
Prediction is hard, especially about the future....

Prediction is hard, especially about the future. (https://quoteinvestigator.com/2013/10/20/no-predict/)
Forum: Marin's Mersenne-aries 2021-09-23, 13:16
Replies: 70
Views: 4,963
Posted By kriesel
which states in part: If that "open" meant...

which states in part:
If that "open" meant found, your hypothesis would seem to be contradicted by the facts. The number of new Mersenne prime discoveries disclosed as occurring between 2018 Dec 8...
Forum: Marin's Mersenne-aries 2021-09-23, 12:45
Replies: 70
Views: 4,963
Posted By kriesel
quickly meaning here, at a rate consistent with...

quickly meaning here, at a rate consistent with his latest prediction that was based on more application of statistics than understanding. Assuming he both has at least one cat0 rated system and is...
Forum: Marin's Mersenne-aries 2021-09-23, 01:21
Replies: 70
Views: 4,963
Posted By kriesel
Oh, yesss. A little late to be learning the...

Oh, yesss.
A little late to be learning the rules (https://www.mersenne.org/thresholds/) of operation for the system you've made predictions about.
Don't know where you get October 10 from....
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