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#1 Amicable Numbers

Posted: Sun Jan 29, 2017 12:46 am
by Alez
I've started a project to extend the exhaustive search limit from 1018 to 264 (~1.845*1019), and also to verify all amicable pairs below 1018. There are ~500,000 amicable pairs still to be found in the range 1018 - 264.

Since the amount of computations is so vast (over 500 CPU core-years; 1000 CPU core-years actually because the project uses replication), I'll need volunteers to help with the search. Everyone is welcome!

I've set up a BOINC server: https://sech.me/boinc/Amicable/

Those who want to participate will need to do the following steps:

Sign up here: https://sech.me/boinc/Amicable/create_account_form.php
Use invitation code "mersenneforum" (without quotes) when you sign up.
Download and install BOINC client if you haven't done it yet: https://boinc.berkeley.edu/download.php
Those who are new to BOINC should first browse https://boinc.berkeley.edu/ and read some manuals/FAQs there.
When BOINC client asks you to add/join a project, provide the following URL:

https://sech.me/boinc/Amicable/

Don't try to find this project in the list in BOINC client, it's not there yet. You'll have to copy-paste the URL.
When BOINC client asks you for credentials, enter email/password of the account you created in step 1.
BOINC client should then connect to the server and start running tasks for the project.


Please report all bugs/issues you encounter either here or on message boards on the project's server: https://sech.me/boinc/Amicable/forum_index.php

The program that will run on your PCs is open-source and can be found here: https://github.com/SChernykh/Amicabl.../boinc-version
Only Windows 64-bit and Linux 64-bit are supported now. I'm also waiting for bug reports/other suggestions at Github.

#2 Re: Amicable Numbers

Posted: Sun Jan 29, 2017 12:47 am
by Alez
Project is MT and available for 64 bit systems both doze and linux.

#3 Re: Amicable Numbers

Posted: Wed Feb 22, 2017 3:16 pm
by scole of TSBT
The project now has Nvidia and ATI GPU test apps. Be sure to select Run test apps in the project prefs.

#4 Re: Amicable Numbers

Posted: Wed Mar 29, 2017 3:36 pm
by scole of TSBT
FYI...

The project has preferences to control how many cores/threads to use for CPU WUs. The default is 1, but you can set it use as many as you want. I don't think there's any benefit for earning more credit but using more cores/threads takes less time to complete WUs. Just depends if want to run a more slow running WUs or fewer fast running WUs.

The project also has preferences to control the number of kernels on GPU WUs. The default is 20 which will have a high utilization rate on your GPU. If your PC UI/screen seems unresponsive or jerky while running the GPU WUs or you have trouble keeping the GPU temps down at a safe level (I keep mine below 70C), then reduce the number of kernels. I dropped mine from 20 to 16 and my GTX 1070 temps dropped from 70C with the fan running at 80% to 65C with fan running at a quieter 70%. If you decrease the number of kernels the WUs will take longer.