20110705, 16:55  #1 
5^{2}×149 Posts 
Double checking
Recently my assignments have switched from LL to double checking. Do I receive credit for the double checking hours? Why would I be switched after a couple of years doing LL tests?

20110705, 18:04  #2 
Dec 2010
Monticello
3403_{8} Posts 
DoubleChecking means LL doublechecking. Of course credit is given for LLD hours.
If you are using a recent version of Prime95 (I'm not certain of this, since the unit of credit on the current v5 server is GHzDays and you speak of hours), and you have "Let the server decide which worktype is best" checked/enabled in your options, then the change in worktype is probably a consequence of your machine becoming relatively slow (seeing as how it is several years old) compared to the most current hardware, and the server assigns LLD tests to those somewhat slower machines. There's also the possibility that you have accumulated enough "reliability" points with the server that you are being asked to help reach the next major GIMPS milestone, proving that M(24036583) is indeed the 41st Mersenne Prime, which is all of 80 LLD tests away from completion. See http://www.mersenne.org/report_milestones/ ; don't hold your breath as about 400 tests were needed back in January. If you are on the V4 server, someone else will need to respond, as I know nothing of it. 
20110705, 18:35  #3  
"Forget I exist"
Jul 2009
Dumbassville
2^{6}·131 Posts 
Quote:


20110705, 18:57  #4  
"Forget I exist"
Jul 2009
Dumbassville
2^{6}·131 Posts 
Quote:
Last fiddled with by science_man_88 on 20110705 at 18:57 

20110705, 19:10  #5  
"Forget I exist"
Jul 2009
Dumbassville
8384_{10} Posts 
Quote:


20110705, 20:20  #6  
"Lucan"
Dec 2006
England
2×3×13×83 Posts 
Quote:
Quote:
The DC "wave" is advancing by ~2M per year. (~5 tests per hour). We wouldn't expect the tail end to pass 24M until next year. OTOH We would expect it to pass 43M in ~10 years. David 

20110705, 21:41  #7  
"Forget I exist"
Jul 2009
Dumbassville
2^{6}·131 Posts 
Quote:
I'm just basing it on what was said 400 > 79 left in 156>186 days gives an average of 1.722.05 turned in a day. at this rate to finish the 79 left will take until the dates suggested , I've done the math. 

20110705, 22:00  #8 
"Forget I exist"
Jul 2009
Dumbassville
2^{6}·131 Posts 
okay 5 test per hour * 24 hour * 365 days = 43800 test a year so you need to knock out or 97.81% of numbers before any tests are done to achieve that.

20110705, 22:18  #9 
"Nathan"
Jul 2008
Maryland, USA
5·223 Posts 
Here's a spreadsheet
Should be fairly selfexplanatory. It looks at the linear and exponential paces for each of the major milestones over several different time intervals.

20110705, 22:28  #10 
"Forget I exist"
Jul 2009
Dumbassville
20300_{8} Posts 

20110706, 02:10  #11 
Dec 2010
Monticello
3403_{8} Posts 
SM88,
The issue is that while the final few hundred LLD checks take a lot of calendar time for a given mersenne prime (because there are relatively few of them left), the vast majority of them proceed much more quickly. 5 LLD per hour =120 per day, about 350K to prove M47, so thats ~3000 days = 10 years. Should happen in your lifetime. Note that a significant portion of prime exponents get shown composite by other means, such as TF and P1, so never need an LL at all, and you can expect that to increase in the next few years. 
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