mersenneforum.org  

Go Back   mersenneforum.org > Other Stuff > Archived Projects > NFSNET Discussion

 
 
Thread Tools
Old 2005-12-06, 12:42   #1
R.D. Silverman
 
R.D. Silverman's Avatar
 
Nov 2003

22·5·373 Posts
Default Stopping on a dime?

I am nearly done sieving 2,1402L.

Last night I did my first filtering pass on the data. The results
show (theoretically) that I could proceed with the LA if I wanted to....

I had a bare excess of 78 equations over ideals and a matrix of about
6.8 million rows.... I have never before seen such a small excess on the
first filter pass. Usually, I still have a defficiency after the first pass.

I will sieve for another two days. This will yield enough relations to
cut the matrix in half and thereby save about 3 weeks of Linear Algebra
time.....

I ran into a bug in my lattice siever when I did some initial experiments
on 2,781-. I was using a reciprocal quintic. This number is only 9 bits
bigger than 2,1402L, but I was only getting a tiny fraction of the
expected yield. I then tried 2,820+, (with a quartic), but this dumped
core. I am guessing that with the size of the factor bases I am using,
that polynomials lower than degree 6 are smooth so often that I am
running out of space to store some data. I need to investigate.
Unfortunately, I am swamped with real work, and don't have the time
right now. I have therefore switched to 2,1011+. I will do 2,781- at
a later time if someone else doesn't do it first.
R.D. Silverman is offline  
Old 2006-03-20, 23:46   #2
Wacky
 
Wacky's Avatar
 
Jun 2003
The Texas Hill Country

44116 Posts
Default

Bob,
thank you for keeping us informed.
Wacky is offline  
 

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Automatically stopping P-1 to benchmark? Why? Uncwilly Software 2 2018-02-23 05:24
Prime95, V28.10 Build1 x64, Lockup Stopping workers dkemppai Software 14 2017-05-17 00:26
Stopping New Work dmaine Information & Answers 1 2011-07-05 22:30
PrimeGrid PSP (Sieve) is stopping soon! Joe O Prime Sierpinski Project 1 2010-11-04 23:05
Stopping Prime95 from Attempting to Transmit Frivolous Result jinydu Lounge 15 2007-01-05 14:12

All times are UTC. The time now is 02:43.


Mon Oct 25 02:43:36 UTC 2021 up 93 days, 21:12, 0 users, load averages: 0.71, 0.79, 1.03

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.