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Search: Posts Made By: ATH
Forum: Lounge 2021-09-24, 21:24
Replies: 11
Views: 198
Posted By ATH
I just got an email from the power company where...

I just got an email from the power company where they are warning me that prices are going up. The next 3 months could be 30% higher than the same period last year, and that is saying something, as I...
Forum: Prime Gap Searches 2021-09-24, 06:10
Replies: 60
Views: 5,325
Posted By ATH
If n=p (mod p*ord(p)) then p*ord(p) < n ...

If n=p (mod p*ord(p)) then p*ord(p) < n even when p > sqrt(n), which I find a bit strange.

For example from the 2-spsp list:
6589845341971 = 485131 * 13583641

ord(13583641) = 485130 ...
Forum: Information & Answers 2021-09-21, 08:20
Replies: 5
Views: 340
Posted By ATH
Testing for primality and factorizing are 2...

Testing for primality and factorizing are 2 different tasks. The primality test for Mersenne Numbers is called the Lucas-Lehmer test and it can test for primality without searching for any factors,...
Forum: Cloud Computing 2021-09-17, 05:28
Replies: 1,168
Views: 125,721
Posted By ATH
This week I'm getting only T4 and K80 on Pro+. ...

This week I'm getting only T4 and K80 on Pro+. I'm not sure I want to pay $50 for that. It might be because I'm running 2 instances, I will test soon if I get P100/V100 if I only run 1 instance.
Forum: Data 2021-09-09, 21:27
Replies: 3,463
Views: 301,015
Posted By ATH
All exponents below 104 286 673 have been tested...

All exponents below 104 286 673 have been tested at least once.

104,286,673 is the 5,994,166th prime number, so we are very close to 1st time checking + factoring the first 6 million prime...
Forum: Cloud Computing 2021-09-08, 16:20
Replies: 14
Views: 666
Posted By ATH
I think you need to restart sessions completely...

I think you need to restart sessions completely after upgrading, and maybe it takes a little bit of time as well.

I was starting to get mostly T4's with occasional P100 on Pro nonplus(sed), and...
Forum: Lounge 2021-09-06, 16:16
Replies: 278
Views: 48,141
Posted By ATH
Here is a "countup" timer: ...

Here is a "countup" timer:
https://www.timeanddate.com/countdown/to?iso=20181207T043210&p0=769&msg=M82589933&font=cursive

So far this is the 3rd longest GIMPS gap. On Nov 19th 2021 it will be the...
Forum: Prime Gap Searches 2021-09-03, 22:13
Replies: 60
Views: 5,325
Posted By ATH
I guess I do not understand why psp-sieve is...

I guess I do not understand why psp-sieve is faster. It looks like you want to psp-sieve to 232.5 (except the first ~10K primes).
Even if ord(p) are precomputed, why is sieving mod (p*ord(p)) faster...
Forum: Prime Gap Searches 2021-09-03, 16:01
Replies: 60
Views: 5,325
Posted By ATH
If you sieve to sqrt(N) you can use a normal...

If you sieve to sqrt(N) you can use a normal sieve, you do not need psp-sieve or Fermat test? Everything remaining will be prime.

I was thinking of another idea:
When you jump ahead, for example...
Forum: Prime Gap Searches 2021-08-24, 15:56
Replies: 60
Views: 5,325
Posted By ATH
It would be faster with 1 SPRP + 1 Lucas than 12...

It would be faster with 1 SPRP + 1 Lucas than 12 SPRP. At least the CPU code with the GMP library 1 Lucas test is about equal to 6.4-6.6 SPRP tests at 264 + 2*1016.
Why does 12 SPRP tests prove...
Forum: y-cruncher 2021-08-17, 12:16
Replies: 68
Views: 48,167
Posted By ATH
62.8 trillion digits, probably \pi * 20 trillion...

62.8 trillion digits, probably \pi * 20 trillion digits.
Forum: Hobbies 2021-07-28, 06:03
Replies: 14
Views: 670
Posted By ATH
Reminds me of Miguel Induráin who won Tour de...

Reminds me of Miguel Induráin who won Tour de France 5 times 1991-1995. I remember they said he was so trained, that if he stopped training completely from one day to the next, by being strapped to a...
Forum: Software 2021-07-19, 15:24
Replies: 446
Views: 46,741
Posted By ATH
At 200K AVX-512 FFT I had to use...

At 200K AVX-512 FFT I had to use "ExtraSafetymargin=0.03" for it to use the next higher 240K FFT, but I guess it depends on how far from the border you are, and maybe on the current FFT.

The next...
Forum: Prime Gap Searches 2021-07-15, 12:18
Replies: 33
Views: 2,147
Posted By ATH
I switched my program from BPSW test...

I switched my program from BPSW test (Miller-Rabin + Lucas) to 2 x Miller-Rabin instead, and it is now twice as fast. I'm pretty sure BPSW test is overkill here. I'm using base 2 and then base 9375,...
Forum: Prime Gap Searches 2021-07-15, 11:36
Replies: 60
Views: 5,325
Posted By ATH
Gratz again! Did you really test everything...

Gratz again!

Did you really test everything up to 264 + 1.249 * 1017 ?
This is 5.36 times further from 264 than your last gap.

What speed are you getting on the 1080 TI ? Either in time per...
Forum: Software 2021-07-09, 17:44
Replies: 36
Views: 1,793
Posted By ATH
I'm not sure you can call this 12-channel RAM. It...

I'm not sure you can call this 12-channel RAM. It is 2 CPU's with 6 channels each. You should definitely run different tests on each physical CPU and each test will get it's own 6-channel RAM.
But...
Forum: Software 2021-07-09, 10:22
Replies: 36
Views: 1,793
Posted By ATH
I have only heard about up to 8-channel memory so...

I have only heard about up to 8-channel memory so far on the newest servers.
Searching for Dell 7920:...
Forum: Lounge 2021-07-06, 18:17
Replies: 25
Views: 1,150
Posted By ATH
I regularly drive from Copenhagen to Stockholm...

I regularly drive from Copenhagen to Stockholm (2-3 times a year). That is only ~640 km ~400 miles (7.5-8h including 1-2 breaks), but I feel that is plenty for me in a single drive, I'm not sure how...
Forum: Software 2021-06-28, 17:37
Replies: 446
Views: 46,741
Posted By ATH
Yeah I switched it :( In case whoever tested it...

Yeah I switched it :( In case whoever tested it wanted to finish it, then it would not be wasted effort.




I'm working on these 2 and going upwards after them. I'm doing P+1, do I need to do...
Forum: Software 2021-06-28, 05:47
Replies: 446
Views: 46,741
Posted By ATH
@Prime95: Is this strange that there are no...

@Prime95: Is this strange that there are no roundoff errors in Prime95 on AVX-512 200K on these 2 exponents that I got roundoff errors on in mprime? or is it very dependent on the specific processor?
Forum: Marin's Mersenne-aries 2021-06-27, 16:01
Replies: 570
Views: 105,400
Posted By ATH
No, it does not mean stating the exponent here in...

No, it does not mean stating the exponent here in this thread!
It means registering the exponent with the primenet server, so that the server will not hand it out to someone else, and the rest of...
Forum: Software 2021-06-27, 15:50
Replies: 446
Views: 46,741
Posted By ATH
You need help testing AVX-512 or FMA3 candidates?...

You need help testing AVX-512 or FMA3 candidates?

It could be hard to find though, since not all exponents above a certain threshold gives the error.
I turned back to AVX-512 200K FFT for a while...
Forum: Prime Gap Searches 2021-06-27, 15:37
Replies: 33
Views: 2,147
Posted By ATH
Personally in my own CPU program if the first...

Personally in my own CPU program if the first SPRP test is positive I do a Lucas test, so effectively a BPSW test. It is a lot slower than just a Fermat test, but it is almost sure not to find any...
Forum: Forum Feedback 2021-06-26, 21:57
Replies: 33
Views: 2,500
Posted By ATH
I think it looks stretched and squeezed, like a...

I think it looks stretched and squeezed, like a 4:3 aspect movie stretched to a 16:9 screen, which is definitely not a compliment.
Forum: Software 2021-06-25, 19:41
Replies: 446
Views: 46,741
Posted By ATH
Happened again and only for 200K AVX-512, worked...

Happened again and only for 200K AVX-512, worked fine on 200K FMA3. I will leave ExtraSafetymargin=0.03 on for now and use 240K AVX-512.

[Work thread Jun 24 22:19:42] P+1 on M4040059, start=2/7,...
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