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Cruelty 2008-06-12 18:19

strange LLR behaviour
 
1 Attachment(s)
I have encountered the following issue with several versions of LLR including latest, running under windows XP.
When looking for Gaussian Mersenne Norms using prefactored till 48bits input file, the exponent 1306069 causes an error: [code]ERROR: Incorrect factor found.
2^1306069+2^653035+1 has a factor : 5224277 and (2^1306069-2^653035+1)/5 has a factor : 1[/code]
It is strange because this error only occurs when the input file contains [code]1306069 48[/code] and does not happen when [code]1306069 5224277 1[/code]
This is not a stability issue, as I have tested it on several configurations including overclocked and non-overclocked ones however only on Core2 systems since I don't have any access to other platforms right now.
Attached is a file you may use for testing purposes.

Mini-Geek 2008-06-12 19:53

I grabbed the file and tried it, but I'm not getting the problem. I'm using an Athlon X2 2.5 GHz.
I get:
[CODE]2^1306069+2^653035+1 has a factor: 5224277
Starting factoring GM1306069 to 2^59
2^1306069+2^653035+1 has a factor: 5224277[/CODE]

em99010pepe 2008-06-12 20:08

I grabbed the file and tried it, but I'm not getting the problem. I'm using Q6600 overclocked to 2.96GHz under Win XP SP2.
I get:
[code]2^1306069+2^653035+1 has a factor: 5224277
Starting factoring GM1306069 to 2^59
2^1306069+2^653035+1 has a factor: 5224277[/code]

Cruelty 2008-06-12 21:09

Did you delete the first line [I]1306069 5224277 1[/I]? If yes then try setting [code]TestGM=1
TestGQ=1[/code]
in [I]llr.ini[/I]

Mini-Geek 2008-06-12 21:17

No, I hadn't done that. With that line out and the settings you mentioned out, I get:
[code]2^1306069+2^653035+1 has a factor : 5224277[/code]With line out, settings in:
[code]ERROR: Incorrect factor found.
2^1306069+2^653035+1 has a factor : 5224277 and (2^1306069-2^653035+1)/5 has a factor : 1[/code]Line in, settings out is how it was at first:
[code]2^1306069+2^653035+1 has a factor: 5224277
Starting factoring GM1306069 to 2^59
2^1306069+2^653035+1 has a factor: 5224277[/code]Line in, settings in it doesn't find a factor quickly and I stopped it during 2^52.

Cruelty 2008-06-12 21:23

Looks like it can be reproduced :smile:


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