2009-03-21, 10:46 | #1 |
(loop (#_fork))
Feb 2006
Cambridge, England
1100011101011_{2} Posts |
warning: zero character
I've never seen this message before, but when building the matrix for a relatively large factorisation (32-bit large primes on both sides) I got
Code:
using 20 quadratic characters above 1624473360 warning: zero character warning: zero character |
2009-03-21, 14:26 | #2 |
Tribal Bullet
Oct 2004
2·3·19·31 Posts |
I figured this was inevitable when jobs started using 32-bit large primes. The code choses quadratic characters from the primes larger than the largest factor of the algebraic sieve values. When you allow 32-bit large primes, there is a danger that some of the quadratic characters will overflow the 32-bit size and wrap around to the smallest primes.
This isn't a fatal error, it just means that any quadratic characters that wrap around will be useless during the linear algebra. As long as you get 5-7 characters that don't do that, it should be enough for the square root phase to work correctly. If you see that warning a large number of times, you may have to modify the code and rerun the matrix building step. |
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