20160110, 08:58  #100  
Just call me Henry
"David"
Sep 2007
Cambridge (GMT/BST)
13171_{8} Posts 
Quote:


20161224, 21:56  #101 
"Patrik Johansson"
Aug 2002
Uppsala, Sweden
2^{3}·53 Posts 
Updated error rate plot
The error rate plot is updated again.
I haven't looked into the increased error rate above 40M yet. (It's too late for me to think clearly.) I don't know if it is only a statistical scatter due to few tests being done, or if it is real. It increases even further, but I only plotted it to 46M, to be able to keep the vertical scale the same. The data files at my web site have also been updated. 
20161225, 15:45  #102 
"Patrik Johansson"
Aug 2002
Uppsala, Sweden
2^{3}×53 Posts 
I suppose that the increased error rate above 40M must be due to an effort to make an early verification of tests that has reported an error. Then it would be better to use only the green curve for the part where not all exponents have been doublechecked. I post a plot updated accordingly.
I also post a second plot which goes up to 80M. 
20161225, 21:58  #103  
Sep 2003
2×1,291 Posts 
Quote:
So it is undoubtedly an artifact that will go away when the wavefront advances and clears more of the routine doublechecks. 

20171223, 23:33  #104 
"Patrik Johansson"
Aug 2002
Uppsala, Sweden
2^{3}×53 Posts 
Updated error rate plot
Here are the updated error rate plots, with data from a few hours ago.

20181224, 21:18  #105 
"Patrik Johansson"
Aug 2002
Uppsala, Sweden
2^{3}×53 Posts 
Updated error rate plot
Here is another update of the error rate plots. Data was downloaded earlier today.

20190101, 17:39  #106 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
4,759 Posts 
Good work, Patrik, keep it up!

20191231, 22:21  #107 
"Patrik Johansson"
Aug 2002
Uppsala, Sweden
2^{3}·53 Posts 
Updated error rate plot
Here are the updated plots for this year.
I merged the data collected from primenet in files that I uploaded here: (The one text file in each zip archive has lines ending in LF, not CR LF.) I think there are still not enough PRP data to make a plot of that. Happy new year! 
20200101, 15:06  #108 
"Robert Gerbicz"
Oct 2005
Hungary
10110001011_{2} Posts 

20200101, 16:17  #109 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
4,759 Posts 
There is very little activity in running PRP DC. More is required to plot a meaningfully sized set of PRP error rate data. Orders of magnitude more. Yes we expect the residual PRP error rate after GEC to be a good approximation of zero, although there were errors found with the code outside the GEC previously. And therefore even fewer resources are being allocated to run PRP DC, than the modest amount running LL DC. LL DC wavefront (~50M) is much lower than the available PRP firsttests on which to run PRP DC (~76M), also, so available PRP DC take longer than available LL DC. PRP DC are perceived as less of a priority since there is less of a backlog, and also less expectation of error.
I think running PRP DC is useful, to empirically confirm the overall error rate is as low as expected, validate hardware and reporting reliability, and just possibly smoke out errors outside the GEC protected code, or some obscure implementation error in the GEC and PRP code. Remember the v17 prime95 shift bug, where the code was sound, except for the rare ~1ppm case where the shift value was within a word's number of bits of the modulo length, or something like that. Or the pentium FDIV bug of long ago. Each was an implementation issue, such that the code behavior did not follow the number theory in infrequent operand cases. See https://www.mersenneforum.org/showpo...9&postcount=14 for the big disparity in effort between LL DC and PRP DC. The changeover from LL to PRP first tests is taking a long time. Last fiddled with by kriesel on 20200101 at 16:34 
20200109, 18:43  #110 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
4,759 Posts 

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