20171230, 23:14  #177 
If I May
"Chris Halsall"
Sep 2002
Barbados
9375_{10} Posts 

20171230, 23:31  #178 
"Rashid Naimi"
Oct 2015
Remote to Here/There
2×7×139 Posts 

20171230, 23:42  #179  
If I May
"Chris Halsall"
Sep 2002
Barbados
3×5^{5} Posts 
Quote:
As someone who has scripts watching the logs, they ignore robots.txt (and they've also said this publiclially). 

20171230, 23:45  #180 
∂^{2}ω=0
Sep 2002
República de California
11566_{10} Posts 
My slowpoke Mlucasavx2 run @4096K  started more or less as a backup to ATH's AWS run, in case he hit any instancerelated issues  is 72 hours in, ETA = 12h, but no reason to delay the announcement for that.

20171230, 23:54  #181 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2·4,591 Posts 
Hmm.
Then there is no need to calculate the residue with start value s_{0}=10, neither. Ever. See page 63 of the PDF. The theorem 9.1 from Jansen (a.k.a. Woltman conjecture) is often misquoted as that ε_{4} and ε_{10} are equal when p={5 or 7} mod 8, but it says instead ε_{4} ▪ ε_{10} = 1 ↔ p={5 or 7} mod 8 (except p==5), that is: ε_{10} = ε_{4} ▪ ((p%8>=5) ? 1 : 1) (except p==5) 
20171230, 23:59  #182  
"Patrik Johansson"
Aug 2002
Uppsala, Sweden
2^{3}·53 Posts 
Quote:
It was quite an educational exercise and it gave me some "hands on" experience of counting Mersenne numbers: I already realized that I must only take the prime exponents, then that I could save time by excluding the exponents that had had a test on Dec 23, and finally that I had missed that there are a lot of numbers with small factors, so that I could save even more time by downloading the factored numbers (to be able to skip them). Also, it gave me an opportunity to use the gmp library again. 

20171231, 00:13  #183  
Sep 2003
2·1,291 Posts 
Quote:


20171231, 00:39  #184 
∂^{2}ω=0
Sep 2002
República de California
11566_{10} Posts 
FYI, Andreas (ATH) kindly gave me access to the AWS c5.9xlarge instance on which he completed his Mlucas run @4608K  he started on a mix of C4 and C5.18xlarge (and started with the slower avx2 build due to compile problems with the Mlucas 17.1 release in avx512 mode), and only late in the verify found the c5.9xlarge gave him slightly better speeds than the c5.18xlarge at half the price. I wanted to test his avx512 build @4096K, as well  long story short, I got a best time of 2.4 msec/iter at that smaller FFT length on the c5.9xlarge, i.e. his verify would have needed just a little over 48 hours had it used that setup for the whole run. Looks like it's time for me to set up a user account for AWS. :)

20171231, 00:43  #185  
"David"
Jul 2015
Ohio
1000000101_{2} Posts 
Quote:
So are you telling me it is time to upgrade the kit? 

20171231, 00:50  #186 
∂^{2}ω=0
Sep 2002
República de California
2×5,783 Posts 
Not at all, though with all the bubblepriced *coins you've been mining using your GPU farm, you should be flush. :)
Your Xeon is doing just fine for my F30 run, where I want the speeds of my 2 runs (one on 32core Xeon, one on 64core KNL) to be reasonably close to each other. But for shorttime occasional work, like, say, the next Mprime verify, AWS rentabeast is a great way to go. 
20171231, 01:54  #187  
Serpentine Vermin Jar
Jul 2014
110011001101_{2} Posts 
Quote:
The NC6s_v3 is currently showing up at $1.53/hr and if it took something like 30 hours (am I even close? No idea...) then we're talking $46 USD for a rapid verification run. I sure thought that'd be a cool use of my $200 credit on my personal account but oh well. Maybe next time. 

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