Message boards : News : Part 3 of the 10^21 search has started
Author | Message |
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Sergei Chernykh Project administrator Project developer Send message Joined: 5 Jan 17 Posts: 522 Credit: 72,451,573 RAC: 0 |
Part 2 of the 1021 search will be finished, for the most part, today. There are still ~2000 unfinished WUs which can take up to a couple of weeks to complete, depending on individual participants processing them. Part 3 of the search will look for amicable pairs where the smaller member of the pair has its largest prime factor between 1011 and 1014: m=m1*p, 1011 < p < 1014 There are too many primes larger than 1014 (all primes up to 5*1019 need to be checked), so they will require a different approach and a new application when the time comes. Most of the participants have already started getting part 3 WUs. The new work units will require ~2.5-2.7 GB RAM on CPU, and the same amount of RAM on GPU (for GPU applications), so the minimum requirement for GPUs will be 3 GB RAM. Update April 9th, 2024: I found a bug in OpenCL applications, which resulted in many false negatives (around 12.5%). The bug was in the new code that I added for the part 3, so the previous search is unaffected. Version 3.09 has this bug fixed, but I had to restart the part 3. Luckily, we were only a couple of weeks in. |
[AF>Amis des Lapins] Bipleouf Send message Joined: 24 Jan 17 Posts: 10 Credit: 11,968,152 RAC: 0 |
Très bonne nouvelle. On est prêt pour manger toute cette nouvelle aventure. Merci pour ton travail :) |
Vitaly Send message Joined: 19 Jul 22 Posts: 1 Credit: 33,080,341 RAC: 0 |
It is interesting how many other searches do you expect? |
Tigers_Dave Send message Joined: 26 Oct 22 Posts: 46 Credit: 6,915,623,336 RAC: 25,955,980 |
Thanks for the update, Sergei. I greatly appreciate the timely updates and explanations! I am delighted to be crunching on behalf of such a well-managed enterprise. |
Sergei Chernykh Project administrator Project developer Send message Joined: 5 Jan 17 Posts: 522 Credit: 72,451,573 RAC: 0 |
I found a bug in OpenCL applications, which resulted in many false negatives (around 12.5%). The bug was in the new code that I added for the part 3, so the previous search is unaffected. Version 3.09 has this bug fixed, but I had to restart the part 3. Luckily, we were only a couple of weeks in. |
Gnarwhals Send message Joined: 18 Jul 23 Posts: 1 Credit: 239,205,250 RAC: 13,473 |
Good catch! Will all Part 3 WU's run on 3.08 need to be re-run? And if so, will the false-negative tasks and/or their earned credit be removed? |
Sergei Chernykh Project administrator Project developer Send message Joined: 5 Jan 17 Posts: 522 Credit: 72,451,573 RAC: 0 |
All old v3.08 WUs need to be re-run (each WU missed ~12.5% of amicable pairs), but earned credit will remain. |
Message boards : News : Part 3 of the 10^21 search has started
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