mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > PrimeNet

Reply
 
Thread Tools
Old 2014-07-24, 02:33   #89
ewmayer
2ω=0
 
ewmayer's Avatar
 
Sep 2002
Rep├║blica de California

983410 Posts
Default

Quote:
Originally Posted by Prime95 View Post
GTX 570 concurs -- not prime. Well, at least it provided a few days of excitement here.
And you got a verified result in the end, so it's not like the runtime was wasted.

Quote:
For the curious, a link to the exponent in question:
http://www.mersenne.org/report_expon...5520823&full=1
p-1 = 2.3.17.642361, so based on the famous extended crank p-1 smoothness hypothesis (eCPM1SHTM) I would have judged the odds of that exponent yielding an M-prime as low - using the statistical measures of p-1 smoothness vs nearby primes I defined in post #32 of this related thread

B -smoothness: 65520823 is 821 of 1103, percentile = 25.66
SL[sup]2[/sup]-smoothness: 65520823 is 820 of 1103, percentile = 25.75

(Compare these %iles with the ones in the summary table in post #59 for known M-primes with p > 100000).
ewmayer is offline   Reply With Quote
Old 2014-07-24, 02:36   #90
cardogab7341
 
Mar 2013
Dallas, TX

2×3×5 Posts
Default

Quote:
Originally Posted by ewmayer View Post
It would be interesting to chart realized flops/watt for a mature program like cudalucas over time, to see if the ratio of touted/realized is at least narrowing from one GPU generation to the next, or if folks are simply throwing more silicon (i.e. watts) at the problem.
http://www.mersenne.ca/cudalucas.php

This is what you seek....
cardogab7341 is offline   Reply With Quote
Old 2014-07-24, 05:51   #91
ewmayer
2ω=0
 
ewmayer's Avatar
 
Sep 2002
Rep├║blica de California

2·3·11·149 Posts
Default

Quote:
Originally Posted by cardogab7341 View Post
http://www.mersenne.ca/cudalucas.php

This is what you seek....
Thanks - so the dflops/W trend is actually quite favorable.
ewmayer is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Modifying the Lucas Lehmer Primality Test into a fast test of nothing Trilo Miscellaneous Math 25 2018-03-11 23:20
Fun with a false positive Madpoo Data 12 2016-06-29 19:00
another false positive? ixfd64 Data 3 2016-03-14 22:11
Question about false positive process Madpoo Data 3 2014-11-07 23:19
False positive? Pi Rho Lounge 4 2003-04-23 14:11

All times are UTC. The time now is 22:18.

Sat Nov 28 22:18:58 UTC 2020 up 79 days, 19:29, 3 users, load averages: 1.49, 1.33, 1.28

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.