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2021-10-22, 08:43   #12
ATH
Einyen

Dec 2003
Denmark

3,253 Posts

Quote:
 Originally Posted by Prime95 Over 414.2M the proof power goes to 11.
.
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2021-10-22, 10:15   #13
kruoli

"Oliver"
Sep 2017
Porta Westfalica, DE

14778 Posts

Quote:
 Originally Posted by ATH .
XKCD 670.

Wouldn't it be nice if the comic was embedded? But I guess that's problematic from a copyright view?

2021-10-22, 13:06   #14
kriesel

"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest

10111110100112 Posts

Quote:
 Originally Posted by Prime95 414.2M+ = 11
Presumably that + is for up to 1G mersenne.org limit, or 1169M max of AVX512 prime95. Or would it apply all the way up to say OBD (3322M)? Is the optimal proof power an output of a straightforward function or does it require empirical testing to determine?

2021-10-22, 18:05   #15
Prime95
P90 years forever!

Aug 2002
Yeehaw, FL

23×971 Posts

Quote:
 Originally Posted by kriesel Presumably that + is for up to 1G mersenne.org limit, or 1169M max of AVX512 prime95. Or would it apply all the way up to say OBD (3322M)? Is the optimal proof power an output of a straightforward function or does it require empirical testing to determine?
It's a simple formula, I've already forgotten it. Shouldn't be hard to re-derive.

I didn't worry about OBD, it looks like the next transition will be near 1600M.

 2021-10-22, 18:46 #16 kriesel     "TF79LL86GIMPS96gpu17" Mar 2017 US midwest 3·19·107 Posts Looks like about every 2 bits on fft length is +1 on proof power. So (extrapolating in Mlucas fft lengths) that would imply power 12 would be sufficient to ~6.2G, ~1.87 Gdigit, not something of concern for decades or centuries. Last fiddled with by kriesel on 2021-10-22 at 18:47
2021-10-22, 19:54   #17
retina
Undefined

"The unspeakable one"
Jun 2006
My evil lair

18B616 Posts

Quote:
 Originally Posted by kruoli Wouldn't it be nice if the comic was embedded? But I guess that's problematic from a copyright view?
Quote:
 Originally Posted by XKCD This means you're free to copy and share these comics
I don't see any problem.

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