mersenneforum.org > Data Error rate plot
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2009-04-22, 17:22   #23
lfm

Jul 2006
Calgary

52×17 Posts

Quote:
 Originally Posted by garo Yes you can with the new Primenet. You just need to customize your report. For example: http://v5www.mersenne.org/report_LL/...B1=Get+LL+data Replace xxxxx with your userid.
Ironicly, that report is only available from the current V5 server but the data seems to stop with the end of the old V4 server.

 2009-04-23, 09:23 #24 garo     Aug 2002 Termonfeckin, IE 51638 Posts Not at all. I get only v5 data. No v4 data.
 2009-10-24, 15:25 #25 patrik     "Patrik Johansson" Aug 2002 Uppsala, Sweden 1A816 Posts Updated error rate plot Here is the updated error rate plot for data until today, Oct 24, 2009 (although I downloaded the number of verified tests on Oct 21, but there should not be a big difference). The plot is explained in the first post in this thread. Attached Thumbnails   Last fiddled with by patrik on 2009-10-24 at 15:28 Reason: Added reference to first post.
 2009-10-24, 19:36 #26 garo     Aug 2002 Termonfeckin, IE A7316 Posts I think we can take 4% as a good approximation of the error rate then. And there does not seem to be significant variation from 5 million to 20 million. I think the spikes at 15 million and 17 million can be explained by the FFT boundaries. Note that George was using a less conservative FFT boundary in earlier versions of Prime95 that would have done the first check in these ranges. Last fiddled with by garo on 2009-10-24 at 19:38
 2009-10-26, 12:23 #27 nucleon     Mar 2003 Melbourne 20316 Posts Bring on ECC for consumer based machines. It's long overdue. -- Craig
 2011-12-24, 17:36 #29 patrik     "Patrik Johansson" Aug 2002 Uppsala, Sweden 23×53 Posts Another update I just made another update from files made from downloads earlier today. The data files I linked to in my previous post are now updated, and go up to 101M. The statistics I use is found in this file and is made from the data files using this C program (in which you would have to look to get an explanation of what the different columns means). Then I make the plot using gnuplot. Code: `#! /bin/tcsh set START_HRF=501 set END_VERIF=575 set INPUT="error_rates_50k_zero.txt" gnuplot << EOD set terminal png set output "error_rates_50k_50M_zero_20111224.png" set title "Error rates" plot "
 2012-05-09, 08:07 #30 Dubslow Basketry That Evening!     "Bunslow the Bold" Jun 2011 40
2012-05-11, 15:44   #31
henryzz
Just call me Henry

"David"
Sep 2007
Cambridge (GMT)

24·353 Posts

Quote:
 Originally Posted by Dubslow Not exactly new-thread worthy, but here's an expo that's into quadruple-check territory with no reported error code yet. My laptop's not yet turned in a bad DC, but then again linded is pretty reliable as well. Cosmic ray type error? I hope spradlin finishes the test quickly.
Assuming a 4% error rate 1 in 1/.04^3 = 1 in 15625 tests should fail 3 times. This expeonent has potentially only failed twice(the correct residue could have been found once). That makes it 1 in 1/0.04^2 = 1 in 625 which is very possible.
I am not at all sure about 4% being the error rate but even with 1% it is 1 in 10000 which would have probably happened a couple of times in GIMPS history.

 2012-05-14, 02:29 #32 PageFault     Aug 2002 Dawn of the Dead 3538 Posts More likely is that the original and / or the doublechecks were done on two error prone machines. Such machines corrupt results even when there are no error codes. Some years back garo, GP2 and myself did alot of work concerning error prone machines. We observed several instances of tests needing a quadruple check or higher.
2012-05-14, 02:35   #33
PageFault

Aug 2002

5×47 Posts

I have data if anyone is interested. I had an error prone machine and one could doublecheck my exponents (the ones with zero error codes). If one were to do that and the doublecheck doesn't match it will clearly be my result which is bad.

Quote:
 Originally Posted by patrik Estimating number of errors with zero error code from unverified tests is the tricky part. Since a good test can have a non-zero error code, and we don't know yet which one of the listed tests that is the good one, it is in principle impossible to know the zero error code error rate.

Last fiddled with by PageFault on 2012-05-14 at 02:35

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