Illustrated guide to Primality testing, also known as PRP.

 

Even though we use the PRP method of Primality testing we use the LLR software because of its easy to use features.

 

Make sure you have read the Getting Started Thread before reading this page.

 

Automated Network Client

 

If you have a computer with an Internet connection this section is for you.

 

Depending on you computer Operating system get one of these: -

 

Windows

Linux

Free BSD

Then unzip these files using an unzipping utility. For windows use WinZip

 

Then register a username on www.mersenneforum.org

Open up llr-clientconfig.txt and replace nobody with your username.

 

Then double click the LLRnet file and run the application. Sit back and relax and the application will do all the work for you.

 

If you want to stop in between, just exit and when you start again the test will resume.

 

Also if you are behind a firewall or have other problems running the network client, please inquire on the forum and some one should be able to help you. You can also get a copy of the server and run your own version of LLRnet. (If you have a LAN). Please inquire.

 

 

Manual PRP client.

 

If you have a computer without an Internet connection this section is for you.

 

1) Downloading all the required software.

 

Depending on you computer Operating system get one of these: (typical software: prp*.* or llr*.*)-

 

Client download

 

Then unzip these files using an unzipping utility. For windows use WinZip

 

2) Reserving a range.

 

Reserve a range on the Pick a range thread by posting a message like,

 

1028000.txt 26 candidates reserved by Your_username

 

This reserved the candidates with n between 1027000 and 1028000 for you.

 

Click on the 1028000.txt link and save the file in the LLR directory.

 

Tips for picking a range: -

 

You can pick several ranges at a time but for now pick only one range to estimate how long it will take you to PRP all the numbers reserved in the range. All reserved ranges should be finished in about 10-15 days. So donít pick more than you can handle.

 

Note if you have a p4, which is on for less than a few hours a day and it is not connected to the Internet, it is better to sieve in such situations.

 

Running the Software.

 

Double click the llr application file.

 

The screen under windows looks like this

 

 

 

 

Note that the icon is red right now.

 

Then click on Test menu and then Input data. (Test ŗ Input data)í

The screen looks likes this

 

 

 

Enter the name of the file reserved, 1028000.txt in the input box and in the output file put primes.log

All primes found are reported in primes.log

Then hit ok

The icon changes to green and the computer starts going work.

 

When the icon changes back to red you are out of work and you need to submit results and get more work.

 

 

 

3) Submitting results

 

When your entire range is done (indicated by the turning of the icon to red color), email /PM all the text from the lresults.txt to ltd. Remember to use your mersenneforum username and not your real name.

 

 

Then post a message here saying something like this

 

1028000.txt 26 candidates completed by Your_Username.

 

In the same message post a message saying what range you would like to reserve next. Now since you know how long it took you to do your current range you can reserve a range that you can finish in a week to 2 weeks. If you need to pick up multiple files, reserve all the files and save them. Then create a file by joining all the files and use that as the input file for LLR.

 

Here is an example.

 

File 1

1000000000:P:0:2:257

149183 1000237

149183 1000517

149183 1000789

 

 

File 2

 

1000000000:P:0:2:257

168451 1000908

258317 1000199

258317 1000271

258317 1000431

 

The combined file will look like

 

File 3

1000000000:P:0:2:257

149183 1000237

149183 1000517

149183 1000789

168451 1000908

258317 1000199

258317 1000271

258317 1000431

 


You can see your progress in the next stats update located here: -

 

www.ldausch.de/stats.html

 

If you have any questions on the process of sieving please ask on PSPís forum, located here.