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Old 2005-04-07, 15:43   #1
Washuu
 
Mar 2005
Poland

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Default PRP3 segfault with big numbers.

PRP3 v 3.1.0 crashes, when I try to process very big number, exceeding 10M in size (ie 20*8087^3453301+1).

What are current limits of PRP3?

Last fiddled with by Washuu on 2005-04-07 at 15:56
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Old 2005-04-07, 15:54   #2
Prime95
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Is this a P4? IIRC prp3 only works on SSE2 machines. I need to build a new executable. In the meantime, you could use LLR 3.5.
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Old 2005-04-07, 15:55   #3
Washuu
 
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Quote:
Originally Posted by Prime95
Is this a P4? IIRC prp3 only works on SSE2 machines. I need to build a new executable. In the meantime, you could use LLR 3.5.
Celeron 4, 1800 Mhz. It has SSE2 for sure.
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Old 2005-04-07, 15:58   #4
Washuu
 
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And the same for PRP.EXE and OpenPGFW. Hmmm, is PRIME95 only 10M-digit enabled program? ;-)

EDIT: checked also on "true" P4 2,8 Ghz. The same problem. :

Last fiddled with by Washuu on 2005-04-07 at 16:04
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Old 2005-04-07, 16:22   #5
Prime95
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I missed the 8087 base. I'll build a new prp3 and test it. You should be aware that these PRP test will be very slow. About 3 times slower than a Mersenne Test.

The limit of prp3 on numbers of this type should be about 39 million bits.
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Old 2005-04-07, 16:30   #6
Washuu
 
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Quote:
Originally Posted by Prime95
I missed the 8087 base. I'll build a new prp3 and test it. You should be aware that these PRP test will be very slow. About 3 times slower than a Mersenne Test.

The limit of prp3 on numbers of this type should be about 39 million bits.
I know. I was just learning PRP3 and OpenPGFW and testing on different numbers. I just haven't expected segfault if I put the wrong numbers.

But my question is still current: what are current expected limits (apart from computer resources)?
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Old 2005-04-07, 17:08   #7
Prime95
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Quote:
Originally Posted by Washuu
But my question is still current: what are current expected limits (apart from computer resources)?
39 million bits when base not equal 2. Your numbers are 44.8 million bits.

Testing k*2^n+/-1 your limit for n will depend on k. For small k, n up to 70+ million. For large k, n up to 39 million.
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