Probable Bug in Prime95 sob p-1 code
While p-1 factoring a probable Bug in Prime 95 appeared: After a few seconds, the factorisation stops and the error "SUMOUT error occurred." is raised.
The program uses 1024k FFT, and can use 300M of memory (220 M on a diffetrent computer).
This problem is reproducible and appears with exponents starting from 9104171 up to 11400000. at that limit, there are roundoff errors every iteration. At 11450000 everything is fine again with the next larger FFT (1280k).
I used the base 67607, but I think that is not that important.
I agree that this is not that important at the moment because the factoring limit is at 7.2M but later it could be a problem.
:lawn:
regards,
Reto
Running multiple copies of George's new factorer?
I'm having some trouble making multiple copies of George's new fatorer run on a dual P4 Xeon. To make it easier to run a number og prp/sieve/factoring jobs on a bunch of machines, I've created some scripts to start the programs on a given machine.
My scripts for starting the new factorer looks like this:
Code:
#! /bin/sh
cd ~/17orbust/p-1_1
./mprime -A1 &
and
Code:
#! /bin/sh
cd ~/17orbust/p-1_2
./mprime -A2 &
(I left out the parts that just makes it easier for me to keep track of which jobs run on which machines and vice versa)
When I try to run these two scripts on the same machine (called shannon), the following happens:
Code:
grove@galois > ./on shannon p-1_1
grove@galois > ./on shannon p-1_2
grove@galois > Another mprime is already running!
What am I doing wrong? Or is it just totally impossible to run multiple copies?