[QUOTE=Mark Rose;416129]Excuse my ignorance, but what is special about 79.3M?[/QUOTE]

Back in the day (early 2000's) it was the largest exponent that P95 could work on, I spent several years (not a misprint) testing 79919219 starting on a Celeron-300...

[QUOTE=Mark Rose;416129]Excuse my ignorance, but what is special about 79.3M?[/QUOTE]
[QUOTE=Gordon;416135]Back in the day (early 2000's) it was the largest exponent that P95 could work on,[/QUOTE]
And almost since the start has been featured a table like the one here:
[url]http://www.mersenne.org/report_classic/[/url]

[QUOTE=Gordon;416135]Back in the day (early 2000's) it was the largest exponent that P95 could work on, I spent several years (not a misprint) testing 79919219 starting on a Celeron-300...[/QUOTE]

OK, I'll bite. If 79.3M was the largest exponent that could be tested, why and how were you testing 79919219? You say "not a misprint", which rules out a typo (or does it?).

[QUOTE=VBCurtis;416157]OK, I'll bite. If 79.3M was the largest exponent that could be tested, why and how were you testing 79919219? You say "not a misprint", which rules out a typo (or does it?).[/QUOTE]
And 79919219 has a small factor, even by the year 2000 standards: 245247148314673 (15 digits)

He probably meant: [URL="http://mersenne.org/M79299719"]http://mersenne.org/M79299719[/URL]

[QUOTE=ATH;416190]He probably meant: [URL="http://mersenne.org/M79299719"]http://mersenne.org/M79299719[/URL][/QUOTE]

If so, it's even sadder that so much time was spent on it only to get a bad result. Well... it happens...

[QUOTE=ATH;416190]He probably meant: [URL="http://mersenne.org/M79299719"]http://mersenne.org/M79299719[/URL][/QUOTE]

[QUOTE=Madpoo;416211]If so, it's even sadder that so much time was spent on it only to get a bad result. Well... it happens...[/QUOTE]

I'm more interested that our illustrious friend 'For Research' also turned in a bad result. (Presumably he has already noticed and fixed whatever the problem may have been)

[QUOTE=Dubslow;416212]I'm more interested that our illustrious friend 'For Research' also turned in a bad result. (Presumably he has already noticed and fixed whatever the problem may have been)[/QUOTE]

Good question... made me look it up.

Turns out that one result is his only bad one from that CPU, not just in 2015 but going back to 2013 (and 875 good results, with only 13 unknowns remaining).

[QUOTE=Madpoo;416215]Good question... made me look it up.

Turns out that one result is his only bad one from that CPU, not just in 2015 but going back to 2013 (and 875 good results, with only 13 unknowns remaining).[/QUOTE]

:huh:

[QUOTE=Madpoo;416215]Turns out that one result is his only bad one from that CPU, not just in 2015 but going back to 2013 (and 875 good results, with only 13 unknowns remaining).[/QUOTE]

Hmmm... Interesting...

And that was on one of my "Highly Reliable" machines (ECC memory, RAID6, no over-clocking, etc). This is now the second time (that I know of) that this has happened (on two different but identical boxes).

I don't know how this happened. I normally never do LLs; possibly I moved an assignment I got by mistake from a slower machine to a faster one. But that's just a guess.

[QUOTE=chalsall;416258]Hmmm... Interesting...

And that was on one of my "Highly Reliable" machines (ECC memory, RAID6, no over-clocking, etc). This is now the second time (that I know of) that this has happened (on two different but identical boxes).

I don't know how this happened. I normally never do LLs; possibly I moved an assignment I got by mistake from a slower machine to a faster one. But that's just a guess.[/QUOTE]

Just blame solar radiation. :smile:

Seriously though, I wonder if it has anything to do with the size of the exponent and the FFT it uses, or something weird like that. Your result didn't have an error code but the other bad result did (a repeatable one though, so it wasn't marked suspect).

You're right though that ECC and a stable, non-OC'd system should be expected to run flawlessly, so I guess I'm back to solar radiation, or gremlins, or whatever. :)