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Old 2016-05-09, 16:36   #1
Siegmund
 
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Default World record sized double-check?

A machine of mine set to "world record sized numbers to test" recently completed M74557619. I was quite startled to see it say "C-Verified" on my results page. Oh well, I thought, I got a recycled exponent and the guy who expired finished it after all.

But then I looked at the exponent status page, and saw that in fact the first-time test had been completed 2005-11-25, long before I was assigned the exponent.

Apparently "world record sized numbers to test" does not mean "world record sized numbers for first-time testing": is assigning world-record-sized double checks an intended behavior, or a bug? I can't remember ever seeing a double-check assigned to one of my workers that was working on world-record-sized numbers before.

GRB
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Old 2016-05-09, 17:01   #2
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I believe with probably bad results the high exponents have been thrown back into the first time pool.

Last fiddled with by Mark Rose on 2016-05-09 at 17:42
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Old 2016-05-09, 17:01   #3
Uncwilly
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World Record means that the exponent is larger than the exponent of the largest known prime. If the original test had a non-zero error code, it might have been mark as available for another first time check. But, when you match and you don't have a "bad" error code, it is marked verified.
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Old 2016-05-09, 17:24   #4
henryzz
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In 2005 that test would have taken a long time to finish(My 2007 era Q6600 is 4x slower than a modern skylake at LLR and probably similar for LL tests). The longer it takes to run a test the more likely it is to have errors.
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Old 2016-05-09, 20:45   #5
Madpoo
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Quote:
Originally Posted by Uncwilly View Post
World Record means that the exponent is larger than the exponent of the largest known prime. If the original test had a non-zero error code, it might have been mark as available for another first time check. But, when you match and you don't have a "bad" error code, it is marked verified.
Uncwilly is correct... it was marked suspect during the first run and results like that are thrown back into the assignment pool as another "first time check". 50% of those do turn out to be bad, on average, so it's understandable.

www.mersenne.org/report_ll/?exp_lo=74557619

You can see the error code using that page.
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Old 2016-05-09, 22:04   #6
Siegmund
 
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That makes sense, and is a good reason to retest it right away.

I didn't see the error code on the regular exponent report (http://www.mersenne.org/report_expon...4557619&full=1) and never crossed my mind that report_ll and report_exponent gave different details.

Thanks all for explanation. (And 2005-11-25 vs. 2015-11-25 was my typo, sorry to sidetrack you, henryzz.)

GRB

Last fiddled with by Siegmund on 2016-05-09 at 22:06
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Old 2016-05-09, 22:39   #7
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Quote:
Originally Posted by Siegmund View Post
But then I looked at the exponent status page, and saw that in fact the first-time test had been completed 2005-11-25, long before I was assigned the exponent.
Quote:
Originally Posted by henryzz View Post
In 2005 that test would have taken a long time to finish
2005 was a typo, should be 2015.
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