mersenneforum.org Redoing factoring work done by unreliable machines
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 2016-11-01, 15:17 #1 tha     Dec 2002 14518 Posts Redoing factoring work done by unreliable machines I noticed user TJAOI did upload some some factoring work today in the range between 63 and 64 bits. They include factors that were missed earlier when the factoring assignments were handed out by the server or done manually mostly about ten years ago. A lot of factors were missed by user "1997rj7" who seems to have done a lot of factoring work back then on a unreliable machine. Can we ( I mean someone ) create a worktodo file that would retest the factoring work by this faulty machine, and maybe other proven faulty machines? There probably are enough volunteers here who would want to work on such a worktodo file. I do.
 2016-11-01, 15:33 #2 petrw1 1976 Toyota Corona years forever!     "Wayne" Nov 2006 Saskatchewan, Canada 10001111101102 Posts My 2 cents ... If TJAOI is already closing in on 64 bits is it not safe to assume he/she has found all missing factors by any and all unreliable machines up to that level? Or are you asking about assignments above 64 bits? Or as long as TJAOI is there do we just let him clean up?
 2016-11-01, 15:55 #3 LaurV Romulan Interpreter     Jun 2011 Thailand 17×19×29 Posts It is about higher bitlevels done by unreliable machines/users, TJAOI will not reach 65 and 66 soon (years). If we find missed factors, we can save some LL. I am with tha, but we better see the list first. It may not worth a re-check. Last fiddled with by LaurV on 2016-11-01 at 15:56
 2016-11-01, 16:03 #4 petrw1 1976 Toyota Corona years forever!     "Wayne" Nov 2006 Saskatchewan, Canada 11F616 Posts Fair enough. Would reviewing the list from TJAOI be the best way to seeing who missed the most and redo all of theirs above xx bits?Do we let TJAOI have 64 to 65 or 66? I assume 1999rj7 isn't the only one. Maybe Madpoo can use a similar magic query he used to get the required DC's.
 2016-11-01, 18:17 #5 Prime95 P90 years forever!     Aug 2002 Yeehaw, FL 163528 Posts There are 33075 results between 1999 and 2010 where the user tested to 2^64 or greater. Can you narrow down which computer or which dates resulted in missed factors?
2016-11-01, 19:05   #6
chalsall
If I May

"Chris Halsall"
Sep 2002

24·5·7·17 Posts

Quote:
 Originally Posted by Prime95 Can you narrow down which computer or which dates resulted in missed factors?
I would be surprised if any new factors, or cheaters, are found.

But whatever rocks your boat. It's your kit / time / energy / money.

Please prove us wrong. Or, alternatively, suggest we are correct.

 2016-11-01, 19:45 #7 airsquirrels     "David" Jul 2015 Ohio 11×47 Posts Unless we know with near certainty that a check from a given machine is wrong, the math to recheck all their results just doesn't add up. Better to do other TF work where you have a ~1/70 chance of saving an LL test vs. 1/700 if 10% of their checks are wrong.
2016-11-01, 20:16   #8
VBCurtis

"Curtis"
Feb 2005
Riverside, CA

3×19×83 Posts

Quote:
 Originally Posted by airsquirrels Unless we know with near certainty that a check from a given machine is wrong, the math to recheck all their results just doesn't add up. Better to do other TF work where you have a ~1/70 chance of saving an LL test vs. 1/700 if 10% of their checks are wrong.
Unless the checks take less than 1/10th the time... Given the choice of 74-75 bit TF work or double-checking 64-67 for someone with a 5% error rate, I'm going to find more factors with the retest per unit time.

2016-11-01, 20:24   #9
chalsall
If I May

"Chris Halsall"
Sep 2002

24×5×7×17 Posts

Quote:
 Originally Posted by VBCurtis Unless the checks take less than 1/10th the time... Given the choice of 74-75 bit TF work or double-checking 64-67 for someone with a 5% error rate, I'm going to find more factors with the retest per unit time.
That assumes the person you are retesting was cheating.

As I said before, I did that kind of retesting myself. And I never found a cheater.

Put PLEASE! Rerun that test. Spend that money.

We will all be *very* interested if you can find a cheater. I didn't.

2016-11-01, 20:34   #10
airsquirrels

"David"
Jul 2015
Ohio

11·47 Posts

Quote:
 Originally Posted by VBCurtis Unless the checks take less than 1/10th the time... Given the choice of 74-75 bit TF work or double-checking 64-67 for someone with a 5% error rate, I'm going to find more factors with the retest per unit time.
My math was based on the idea of doing 64-67 ahead of the wave, all the way up to the 999..M mark. Doing 64-67 for new exponents gets you more exponents cleared than rechecking 64-67 at a 5-10% error rate.

Rechecking where that range is queued by someone else for 74-75 TF or LL/LL-DC, maybe you save some CPU.

I've thought about doing this for some of my own work. I once discovered a card that had a 1/100 error rate on the mfakto self-test, but had been TFing that way for months. I fixed the issue with the card (driver), but at the end of the day I could not justify going back over months of work on another card.

Last fiddled with by airsquirrels on 2016-11-01 at 20:36

2016-11-01, 21:46   #11
GP2

Sep 2003

13·199 Posts

Quote:
 Originally Posted by tha I noticed user TJAOI did upload some some factoring work today in the range between 63 and 64 bits. They include factors that were missed earlier when the factoring assignments were handed out by the server or done manually mostly about ten years ago. A lot of factors were missed by user "1997rj7" who seems to have done a lot of factoring work back then on a unreliable machine.
You mention TF:63-64 factors uploaded by TJAOI today (Nov 1). Below is the list of all such exponents I see currently in the "cleared" listing, all uploaded by TJAOI on Oct 31 at 20:53.

However, this list doesn't match your description. Most of these exponents are > 100M and presumably done by GPU rather than mprime, more recently than ten years ago, and the "culprits" are all sorts of people, not "1997rj7". Can you clarify which exponents are involved? Perhaps they were uploaded a couple of days ago rather than today, and have now disappeared off the "cleared" listing.

Code:
13128419  9355676489974796977
16556363  14981465658515268727
17841221  14001530903059537847
33088541  15288705018849658519
33122153  15040775811986445743
33142423  16944060969483680321
66104189  14713328536491742193
66195611  17797707556291217479
66219407  18335189697371799671
132131101 12808666766487948431
132150919 16344484188919006721
132308147 17038091606573716753
132343297 17972353937967188791
132385271 15151310052639715127
132395539 16824273427475392943
132545783 18240167095628118409
132833819 15808866343324379257
188141959 15845114013007218697
188376091 12065395018065595007
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188398271 14516492533152659617
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532405849 15119079382147455191

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