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: -
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*.*)-
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 don’t 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 à Input data)’
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: -
If you have any questions on the process
of sieving please ask on PSP’s forum, located here.