Hi, > >This difficult could also dissappear making the second test over the same > >exponent. We then get the L-L and double check at once. Remember the > > scheme Prime95 uses to make double check is to shift initally a random > > number of bits. > > Testing a number in parallel with itself is obviously a bad idea if there > occurs an undetected error. :-) >
I also think it would no be as solid as two L-L running on two machines, once said that, I can't imagine an error giving the same residue in both streams with two different random starting point bits. This independence is the base of all Double-check made with Prime95 for the exponents tested with the same program. The risk of matching residues by casualty is negligible (almost 2^(-64) ~ 0). This way the v.19 bug would be discovered inmediately, because any residue wouldn't match.. Regards. Guillermo. _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
