mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Software

Reply
 
Thread Tools
Old 2019-11-20, 02:48   #1
cappy95833
 
Mar 2014

3 Posts
Default Best type of work for lowest exponent work?

What is the best selection for "Type of work to get" to work on sub-million exponents?

I have "Whatever makes the most sense" currently selected, but i keep getting 90,000,000+ exponents.

If there isn't a good choice, is there a way to make my own filter of what type of work to select?
Attached Thumbnails
Click image for larger version

Name:	2019-11-19 18:07:15.png
Views:	50
Size:	269.1 KB
ID:	21333  

Last fiddled with by cappy95833 on 2019-11-20 at 02:55 Reason: adding question details
cappy95833 is offline   Reply With Quote
Old 2019-11-20, 03:03   #2
LaurV
Romulan Interpreter
 
LaurV's Avatar
 
Jun 2011
Thailand

2·3·1,471 Posts
Default

For "sub million" you can only do cofactor primality test or ECM. As the table you posted says, the only available work type is the ECM work, so we suggest you do that if you like finding record factors. Not that you will find a lot, but you may get lucky.

Other work types below 1M make no sense, all the LL were done long ago (multiple-multiple times), TF has zero* chances to find a new factor (due to ECM and P-1 amount done in the range) and extending P-1 limits, albeit has some minuscule chances of getting you a new factor, like around 0.1% or so, involves repeating a lot of work already done by others in the past (because P-1 checkpoints are not saved in the server, it would be too much a haste, so if you extend P-1 bounds, first of all, that is manual work, you can not get assignments from the server, you have to make the worktodo file by yourself, and second, 99.9% of the work you do, like raising to the former boundaries, was already done by other people, you only contribute the additional step, but for that, you have to do all the work from scratch).

If you have a good computer, we suggest you forget about "under million" part, and do normal "what makes sense" LL/PRP assignments in the 90M, or DC in the 50-60M. If you have a good GPU which you like to assign to GIMPS work, than you may either do TF on GPU72, or LL/PRP using cudalucas or gpuowl (read around about).

Last fiddled with by LaurV on 2019-11-20 at 03:25
LaurV is offline   Reply With Quote
Old 2019-11-20, 06:22   #3
ATH
Einyen
 
ATH's Avatar
 
Dec 2003
Denmark

5·593 Posts
Default

Cofactor primality test is done since a long time under 1M except a few once in a while when a new factor is found.

The CF wavefront is at 9.9M and the CF DC at 7.9M.
ATH is online now   Reply With Quote
Old 2019-11-20, 13:45   #4
lycorn
 
lycorn's Avatar
 
Sep 2002
Oeiras, Portugal

2·701 Posts
Default

In fact, as LaurV and ATH pointed out, the only work type suitable to exponents in the 0 - 1M range is ECM. I am currently doing it, and have found a fair amount of new factors (64 since mid march, to be more precise). If you want to give it a try, use the Primenet manual assignments form, choose ECM Factoring as the type of work and specify a range < 1 M.
lycorn is offline   Reply With Quote
Old 2019-11-20, 17:36   #5
storm5510
Random Account
 
storm5510's Avatar
 
Aug 2009
U.S.A.

110010000112 Posts
Default

Quote:
Originally Posted by LaurV View Post
For "sub million" you can only do cofactor primality test or ECM. As the table you posted says, the only available work type is the ECM work, so we suggest you do that if you like finding record factors. Not that you will find a lot, but you may get lucky.,,,
Just for reference, I have found 23 factors in 16,644 ECM runs. So, yes, the possibility is quite low. I found a factor using this method which was 39 digits in length. I thought that was pretty good.

The area needing the most attention is double-check, referred to here as "DC." These can take time to finish, depending on your hardware.
storm5510 is offline   Reply With Quote
Old 2019-11-21, 04:24   #6
kriesel
 
kriesel's Avatar
 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest

456710 Posts
Default Welcome

Perhaps you'd find something at https://www.mersenneforum.org/showth...922#post521922 useful background.
kriesel is online now   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Type of work to get? Bispen Information & Answers 3 2016-01-27 16:46
Type of work I'm doing Unregistered Information & Answers 17 2013-06-22 04:49
Best type of work for my cpu Unregistered Information & Answers 11 2013-05-17 05:22
Type of work to get? ZFR Information & Answers 7 2011-09-17 08:43
What type of work should I request? Malta Soron PrimeNet 5 2006-10-07 22:03

All times are UTC. The time now is 12:13.

Tue Oct 20 12:13:08 UTC 2020 up 40 days, 9:24, 0 users, load averages: 3.29, 3.27, 2.96

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, 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.