PrimeGrid
Please visit donation page to help the project cover running costs for this month

Toggle Menu

Join PrimeGrid

Returning Participants

Community

Leader Boards

Results

Other

drummers-lowrise
1) Message boards : Generalized Fermat Prime Search : GFN-1x Small Primes search starts 2021-01-21 (Message 152394)
Posted 6 days ago by stream
90% done, and we found new special sequence!

1785803204^8192+3 - Twin (p; p+2). This is a PRP so it cannot be reported to T5K.

(First post updated)
2) Message boards : Prime Sierpinski Problem : Optimizing PSP processing with LLR2 .... (Message 152352)
Posted 9 days ago by stream
how do I know what my cache is?
I don't know an app nor a command for Linux.

In Linux, everything is in /proc/cpuinfo - just read this file or filter necessary lines:

cat /proc/cpuinfo | grep cache

3) Message boards : Generalized Fermat Prime Search : GFN-14/13/... MEGA Prime Search on GFN Server (Message 152227)
Posted 19 days ago by stream
GFN-12 MEGA is finished!

Last task returned today.

Honestly, I expected that fifth prime will eventually pop up (a gap between last prime and leading edge is too high) but no luck. So we finished with 4 primes, two of them were successfully confirmed (base factorized) and reported.

GFN-11 MEGA is theoretically possible, but it'll require new LLR program which will be released soon and server software update. So no exact dates yet, stay tuned for updates in this thread!
4) Message boards : Problems and Help : Not first in PPS-MEGA? (Message 152215)
Posted 20 days ago by stream
I just noticed a similar thing with the following workunit in PPS (LLR) on my side: https://www.primegrid.com/workunit.php?wuid=752085641

This is another rare problem. You returned a task with correct residue, but invalid certificate. It can be a glitch of your PC on the last step of calculations (when certificate is being created), or bug in LLR. The problem is quite rare, we have only 1-2 such tasks per week. In most cases they're resolved automatically - second task was sent and successfully validated without questions. Since your task had correct residue, it also was accepted as valid, regardless of invalid certificate part.
5) Message boards : Generalized Fermat Prime Search : GFN-1x Small Primes search starts 2021-01-21 (Message 152195)
Posted 21 days ago by stream
85% done!

Recent great boost in production shifted estimated completion date back to 2021, but there are two GPU challenges ahead. Can we still finish this project in 2021?
6) Message boards : General discussion : Suggestions for 2022 challenges (Message 152189)
Posted 22 days ago by stream
As far as I remember (correct me if I wrong), biggest problem is PFGW do not have checkpoints for primorial/factorial, this makes it useless for real Boinc projects.
7) Message boards : Generalized Fermat Prime Search : GFN-14/13/... MEGA Prime Search on GFN Server (Message 152019)
Posted 34 days ago by stream
GFN-12 Mega is coming to the end.

2021-10-26: No new work will be loaded after this date

And today is October 28. Only about 500 tasks are currently unsent, and it'll be over in a day or two.

Also, second unreported prime is now open (no luck with ECM).
8) Message boards : Generalized Fermat Prime Search : GFN-14/13/... MEGA Prime Search on GFN Server (Message 151945)
Posted 38 days ago by stream
I got a GFN11Mega running at the command line with LLR2
Maybe the 300 limit was extended but not documented?

It will not refuse such test, it has no error checking at all and just silently overrides adjacent memory regions.

To be exact, each component of the test (k, b, n, c) should not exceed 299 characters. So whole test expression can be longer but it'll not help us because we have very long b.
9) Message boards : Generalized Fermat Prime Search : GFN-14/13/... MEGA Prime Search on GFN Server (Message 151877)
Posted 42 days ago by stream
It'll be much worse with GFN-11 bases which will be 353 digits.

Shouldn't that be 489?

Yes. I've edited the post.
10) Message boards : Generalized Fermat Prime Search : GFN-14/13/... MEGA Prime Search on GFN Server (Message 151874)
Posted 42 days ago by stream
Has any decision been made regarding GFN-11 MEGA?

I think yes. Mostly because peoples like to crunch new applications for WuProp badges. Also we'll have some results as examples for this kind of primes. But cons are also great:

- Results are expected to be non-reportable PRP. We failed to factorize half of GFN-12 MEGA bases (245 digits). It'll be much worse with GFN-11 bases which will be 489 digits. ECM can find only 55-digits factors in reasonable time (1 month on standard 4-core PC). We must be extremely lucky to find a base which either consist of small factors only either have one extremely large prime factor (so each remaining part will not exceed 55 digits).

- I have to rewrite few things on my server. Earlier, everything was controlled from LLR command line and my work to setup new project was just to copy/paste some lines changing necessary constants. GFN-11 MEGA candidates will exceed LLR(2) command line limit of 300 characters in the tested expression, so I have to write new file-based work generation and task distribution system for this project (and check that nothing will overflow inside LLR even in this case).


Next 10 posts
[Return to PrimeGrid main page]
DNS Powered by DNSEXIT.COM
Copyright © 2005 - 2021 Rytis Slatkevičius (contact) and PrimeGrid community. Server load 2.99, 2.44, 2.15
Generated 2 Dec 2021 | 13:55:39 UTC