mersenneforum.org  

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

Reply
 
Thread Tools
Old 2009-04-22, 17:22   #23
lfm
 
lfm's Avatar
 
Jul 2006
Calgary

52×17 Posts
Default

Quote:
Originally Posted by garo View Post
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.
lfm is offline   Reply With Quote
Old 2009-04-23, 09:23   #24
garo
 
garo's Avatar
 
Aug 2002
Termonfeckin, IE

51638 Posts
Default

Not at all. I get only v5 data. No v4 data.
garo is offline   Reply With Quote
Old 2009-10-24, 15:25   #25
patrik
 
patrik's Avatar
 
"Patrik Johansson"
Aug 2002
Uppsala, Sweden

1A816 Posts
Default 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
Click image for larger version

Name:	error_rates_50k_50M_20091024.png
Views:	190
Size:	6.9 KB
ID:	4232  

Last fiddled with by patrik on 2009-10-24 at 15:28 Reason: Added reference to first post.
patrik is offline   Reply With Quote
Old 2009-10-24, 19:36   #26
garo
 
garo's Avatar
 
Aug 2002
Termonfeckin, IE

A7316 Posts
Default

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
garo is offline   Reply With Quote
Old 2009-10-26, 12:23   #27
nucleon
 
nucleon's Avatar
 
Mar 2003
Melbourne

20316 Posts
Default

Bring on ECC for consumer based machines.

It's long overdue.

-- Craig
nucleon is offline   Reply With Quote
Old 2010-12-26, 15:05   #28
patrik
 
patrik's Avatar
 
"Patrik Johansson"
Aug 2002
Uppsala, Sweden

23×53 Posts
Default Error rate plot with zero error code

I just made an update to the error rate plot, and this time I also added information about errors with zero error code. Dividing the exponents into classes 50000 wide when summing the errors seems to give a reasonable trade-off between resolution and statistical noise.

The red curve shows the error rate (number of bad tests divided by number of tests). The green curve estimates the error rate by also including data from unverified tests. (If two non-matching tests have been done for an exponent, at least one of them must be bad, so I count this one.) The blue curve is the zero error code error rate (number of bad tests with zero error code divided by number of tests). Finally the violet curve estimates the zero error code error rate, by also using unverified tests.

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. I simply assume that the good test had zero error code. (E.g. one exponent has four unverified tests done, two with non-zero error code and two with zero error code. Then I assume three tests are bad and one good, and that one of the three bad tests had zero error code.)

If anyone is interested, I uploaded the data files I retrieved from primenet to my web site, Nlucas_v.zip, Nhrf3.zip and Nbad.zip. (I did not retrieve verified < 18M again, so any un-needed triple check is absent. Also, they were retrieved during a few hours, so a few exponents may have moved during that time.)
Attached Thumbnails
Click image for larger version

Name:	error_rates_50k_50M_zero_20101225.png
Views:	246
Size:	9.2 KB
ID:	6000  
patrik is offline   Reply With Quote
Old 2011-12-24, 17:36   #29
patrik
 
patrik's Avatar
 
"Patrik Johansson"
Aug 2002
Uppsala, Sweden

23×53 Posts
Default 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 "<head -$END_VERIF $INPUT" using 1:(\$2 / \$3) with line title "from bad and verified tests", \
"<tail +$START_HRF $INPUT" using 1:((\$2 + \$4)/(\$3 + \$5)) with line title "estimated also using unverified tests", \
"<head -$END_VERIF $INPUT" using 1:(\$6 / \$3) with line title "with zero error code, from bad and verified tests", \
"<tail +$START_HRF $INPUT" using 1:((\$6 + \$7)/(\$3 + \$5)) with line title "with zero error code, estimated also using unverified tests"
EOD
Attached Thumbnails
Click image for larger version

Name:	error_rates_50k_50M_zero_20111224.png
Views:	187
Size:	9.3 KB
ID:	7436  
patrik is offline   Reply With Quote
Old 2012-05-09, 08:07   #30
Dubslow
Basketry That Evening!
 
Dubslow's Avatar
 
"Bunslow the Bold"
Jun 2011
40<A<43 -89<O<-88

3·29·83 Posts
Default o_0

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.
Dubslow is offline   Reply With Quote
Old 2012-05-11, 15:44   #31
henryzz
Just call me Henry
 
henryzz's Avatar
 
"David"
Sep 2007
Cambridge (GMT)

24·353 Posts
Default

Quote:
Originally Posted by Dubslow View Post
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.
henryzz is offline   Reply With Quote
Old 2012-05-14, 02:29   #32
PageFault
 
PageFault's Avatar
 
Aug 2002
Dawn of the Dead

3538 Posts
Default

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.
PageFault is offline   Reply With Quote
Old 2012-05-14, 02:35   #33
PageFault
 
PageFault's Avatar
 
Aug 2002
Dawn of the Dead

5×47 Posts
Default

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 View Post
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
PageFault is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
error rate and mitigation ixfd64 Hardware 4 2011-04-12 02:14
EFF prize and error rate S485122 PrimeNet 15 2009-01-16 11:27
A plot of Log2 (P) vs N for the Mersenne primes GP2 Data 3 2003-12-01 20:24
What ( if tracked ) is the error rate for Trial Factoring dsouza123 Data 6 2003-10-23 22:26
Error rate for LL tests GP2 Data 5 2003-09-15 23:34

All times are UTC. The time now is 00:45.

Thu Apr 2 00:45:47 UTC 2020 up 7 days, 22:18, 3 users, load averages: 0.89, 1.09, 1.16

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.