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Old 2008-06-12, 18:19   #1
Cruelty
 
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May 2005

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Default strange LLR behaviour

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
It is strange because this error only occurs when the input file contains
Code:
1306069 48
and does not happen when
Code:
1306069 5224277 1
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.
Attached Files
File Type: txt GMN_error.txt (43 Bytes, 99 views)
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Old 2008-06-12, 19:53   #2
Mini-Geek
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"Tim Sorbera"
Aug 2006
San Antonio, TX USA

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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
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Old 2008-06-12, 20:08   #3
em99010pepe
 
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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

Last fiddled with by em99010pepe on 2008-06-12 at 20:09
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Old 2008-06-12, 21:09   #4
Cruelty
 
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Did you delete the first line 1306069 5224277 1? If yes then try setting
Code:
TestGM=1
TestGQ=1
in llr.ini
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Old 2008-06-12, 21:17   #5
Mini-Geek
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"Tim Sorbera"
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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
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
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
Line in, settings in it doesn't find a factor quickly and I stopped it during 2^52.
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Old 2008-06-12, 21:23   #6
Cruelty
 
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Looks like it can be reproduced
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