Prime? Nice try, but no cigar!!

2019-05-05, 23:12

M( 91403479 )P, offset = 473212, n = 5600K, CUDALucas v2.05.1

what do i do?

GP2 · 2019-05-05, 23:14

Quote:

Originally Posted by leumas

what do i do?

Upgrade to a version of CUDALucas more recent than 2.05.1

2019-05-06, 00:32

the most uptodate version is 2.05.01

2019-05-06, 00:34

nvm found it

Code:

Starting M91403479 fft length = 5600K


|   Date     Time    |   Test Num     Iter        Residue        |    FFT   Error     ms/It     Time  |       ETA      Done   |
|  May 05  17:33:56  |  M91403479     10000  0x14b7fdfb6e844ec8  |  5600K  0.01563   46.838   234.1s  |   49:10:41:33   0.01%  |

why is it taking significantly longer now?

Batalov · 2019-05-06, 00:38

Quote:

Originally Posted by leumas

why is it taking significantly longer now?

Because this version works (as opposed to pretending to work).

2019-05-06, 00:43

oh nvm it goes back to 30 days now probbly i was running the card on sth else

does that mean i wasted a month of idle computing time for nothin?

GP2 · 2019-05-06, 00:51

Quote:

Code:

Starting M91403479 fft length = 5600K

|   Date     Time    |   Test Num     Iter        Residue        |    FFT   Error     ms/It     Time  |       ETA      Done   |
|  May 05  17:33:56  |  M91403479     10000  0x14b7fdfb6e844ec8  |  5600K  0.01563   46.838   234.1s  |   49:10:41:33   0.01%  |

Did you retain the output from the first run? If so, can you post it here as an attachment?

If the Residue column says 0x0000000000000000 for anything but the final result, it's almost certainly bad.

GP2 · 2019-05-09, 07:07

A double check indicates that M91403479 is not prime.

ATH · 2019-05-09, 07:52

CUDALucas 2.06 is finally listed as the main version and not a beta version:

https://sourceforge.net/projects/cudalucas/files/

henryzz · 2019-05-09, 09:11

I have renamed the thread so we don't get a ton of people thinking there is actually a prime.

kriesel · 2019-05-11, 21:15

Quote:

Originally Posted by leumas

M( 91403479 )P, offset = 473212, n = 5600K, CUDALucas v2.05.1

what do i do?

If it had been: http://www.mersenneforum.org/showpos...5&postcount=14
Some recommended CUDALucas background reading (particularly posts 3, 4 and 6 and attachments) https://www.mersenneforum.org/showthread.php?t=23387

2019-05-05, 23:12	#1
leumas 2²×3³×7 Posts	Prime? Nice try, but no cigar!! M( 91403479 )P, offset = 473212, n = 5600K, CUDALucas v2.05.1 what do i do?

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2019-05-06, 00:32	#3
leumas 17² Posts	the most uptodate version is 2.05.01

2019-05-06, 00:43	#6
leumas 11101011000₂ Posts	oh nvm it goes back to 30 days now probbly i was running the card on sth else does that mean i wasted a month of idle computing time for nothin?

2019-05-09, 07:07	#8
GP2 Sep 2003 5×11×47 Posts	A double check indicates that M91403479 is not prime.

2019-05-09, 07:52	#9
ATH Einyen Dec 2003 Denmark 3159₁₀ Posts	CUDALucas 2.06 is finally listed as the main version and not a beta version: https://sourceforge.net/projects/cudalucas/files/

2019-05-09, 09:11	#10
henryzz Just call me Henry "David" Sep 2007 Cambridge (GMT/BST) 2³×3×5×7² Posts	I have renamed the thread so we don't get a ton of people thinking there is actually a prime.