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Search: Posts Made By: Gary
Forum: FermatSearch 2020-10-12, 07:23
Replies: 318
Views: 40,877
Posted By Gary
Here is a preliminary full list of the xGF(*,a,b)...

Here is a preliminary full list of the xGF(*,a,b) divisibilities where a,b <= 12.


7 * 2^18233956 + 1 divides GF(18233952,7)
7 * 2^18233956 + 1 divides xGF(18233953,7,4)
7 * 2^18233956 + 1...
Forum: FermatSearch 2020-10-11, 03:56
Replies: 318
Views: 40,877
Posted By Gary
Wilfrid Keller is aware of the new factor and...

Wilfrid Keller is aware of the new factor and just updated his Fermat factors page. I expect he will update the GFN pages once the pfgw run completes. I am running it through pgfw also, as a double...
Forum: FermatSearch 2020-10-05, 03:17
Replies: 318
Views: 40,877
Posted By Gary
Congrats Ryan!!!!!!!!!! That is one HUGE...

Congrats Ryan!!!!!!!!!! That is one HUGE factor. :w00t:
Forum: Lounge 2020-08-19, 02:28
Replies: 70
Poll: GIMPS shirts
Views: 7,838
Posted By Gary
I received my two T-shirts today. The package...

I received my two T-shirts today. The package looks like it has traveled half way around the world (which it has!), but the shirts came through in good condition. And they look awesome! I really like...
Forum: Software 2020-02-06, 04:06
Replies: 5
Views: 1,617
Posted By Gary
Also, from looking at mprime source, I think...

Also, from looking at mprime source, I think NoMoreWork=1 has to be in the "global section" of the prime.txt file, before any section headers like [PrimeNet]. When I stuck it at the end of the...
Forum: Software 2020-02-06, 02:17
Replies: 46
Views: 6,569
Posted By Gary
Hi Simon. I agree with Curtis that your flat...

Hi Simon. I agree with Curtis that your flat performance vs # cores is likely a symptom of being memory bandwidth limited at that size of FFT. If you can afford it, I would recommend installing 8...
Forum: Software 2020-02-01, 02:59
Replies: 5
Views: 1,617
Posted By Gary
The whatsnew.txt file for 25.5 says " Several...

The whatsnew.txt file for 25.5 says " Several files have been renamed so that they are not changed by Windows save/restore. Prime.ini is now prime.txt. ..."

So should the NoMoreWork=1 line be...
Forum: PrimeNet 2020-01-11, 22:27
Replies: 8
Views: 2,748
Posted By Gary
Just wondering what the status is on creating a...

Just wondering what the status is on creating a benchmark page for all-cores results. It would be helpful to know what the best reported all-cores performance achieved by others is when setting up a...
Forum: Operazione Doppi Mersennes 2019-12-09, 03:47
Replies: 373
Views: 36,557
Posted By Gary
Looks like you are right! When running small...

Looks like you are right! When running small ranges, each time before an error occurs the number of factors surviving the sieve is zero (total_bit_count = 0 in the tf_*.h kernel). This causes the...
Forum: Operazione Doppi Mersennes 2019-11-30, 16:41
Replies: 373
Views: 36,557
Posted By Gary
I found it curious that Andreas got errors when...

I found it curious that Andreas got errors when trying to verify the factors of F205 and F215, since Serge said he verified these factors when he released version 0.28...
Forum: FermatSearch 2019-11-04, 07:32
Replies: 189
Sticky: Reservations
Views: 24,239
Posted By Gary
Finished searching n = 1600-1699, k = 60e9-70e9....

Finished searching n = 1600-1699, k = 60e9-70e9. No factors found.
Forum: FermatSearch 2019-11-01, 12:44
Replies: 189
Sticky: Reservations
Views: 24,239
Posted By Gary
I can finish this as part of my search. Thanks...

I can finish this as part of my search. Thanks for the heads up on releasing the range.
Forum: Software 2019-08-12, 02:16
Replies: 447
Views: 33,368
Posted By Gary
Yes, agreed. The point I was trying to make...

Yes, agreed. The point I was trying to make (maybe poorly) was that even when I use the pmax that maximizes throughput of gfndsieve at n=40, it is still only half the throughput of GMP-Fermat. Once I...
Forum: Software 2019-08-11, 14:48
Replies: 447
Views: 33,368
Posted By Gary
Here are the optimal pmax values I found for...

Here are the optimal pmax values I found for various values of n:


n pmax
40 3e06
60 1e08
80 1e09
100 1e09
150 1e09
...
Forum: Software 2019-08-07, 04:23
Replies: 447
Views: 33,368
Posted By Gary
It's not urgent. I can wait for the next release....

It's not urgent. I can wait for the next release. I have determined the optimal pmax for n from 40 to 10k, and have a run going now for up to 100k. I should be able to send you a table in a day or...
Forum: Software 2019-08-05, 06:33
Replies: 447
Views: 33,368
Posted By Gary
I can test several of the Ns in the FermatSearch...

I can test several of the Ns in the FermatSearch Productivity table and determine a ball-park optimal value of pmax. Will take a few days.
Forum: Software 2019-08-04, 22:19
Replies: 447
Views: 33,368
Posted By Gary
Mark, I am doing some benchmarking of gfndsieve...

Mark, I am doing some benchmarking of gfndsieve (mtsieve 1.9.3) with various values of N. When I run a range of K that is greater than the default -X size, the program seems to go into an infinite...
Forum: FermatSearch 2019-04-28, 16:50
Replies: 44
Sticky: Fermat code
Views: 5,998
Posted By Gary
I recommend changing the M/T column to mean CPU...

I recommend changing the M/T column to mean CPU M/T. Any program that is CUDA or OpenCL is clearly multi-threaded since it uses many GPU cores / threads in addition to at least one CPU core. The...
Forum: FermatSearch 2019-04-27, 14:40
Replies: 44
Sticky: Fermat code
Views: 5,998
Posted By Gary
In the table at...

In the table at http://www.fermatsearch.org/download.php (http://www.fermatsearch.org/download.php) Feromant has a "y" in the M/T column, which I interpreted to mean Feromant is multi-threaded....
Forum: FermatSearch 2019-04-19, 20:23
Replies: 44
Sticky: Fermat code
Views: 5,998
Posted By Gary
Thanks Roman. I would like to try out Feromant on...

Thanks Roman. I would like to try out Feromant on one of my servers at work, since (according to Fermatsearch) Feromant is the fastest CPU only program for many ranges of N and is multi-threaded....
Forum: FermatSearch 2019-04-06, 18:00
Replies: 44
Sticky: Fermat code
Views: 5,998
Posted By Gary
Is there a version of feromant (CPU only) for...

Is there a version of feromant (CPU only) for Linux? Thanks!
Forum: FermatSearch 2019-04-02, 03:11
Replies: 318
Views: 40,877
Posted By Gary
Thanks for the suggestion Robert, and for walking...

Thanks for the suggestion Robert, and for walking me through the math. I am not a mathematician, so the explanation was very helpful. I will add this to the program the next time I am making changes....
Forum: FermatSearch 2019-03-31, 15:59
Replies: 318
Views: 40,877
Posted By Gary
Thanks mathwiz! That depends on what you...

Thanks mathwiz!

That depends on what you mean by "fully". For every range assigned to me in the fermatsearch.org Merge Tables, I have tested each Proth number (k * 2^n + 1) that survives the sieve...
Forum: FermatSearch 2019-03-26, 04:15
Replies: 318
Views: 40,877
Posted By Gary
A new factor from FermatSearch

I would like to report the following new Fermat factor:

332,436,749 * 2^9865 + 1 divides F9863

This was discovered March 23 using pmfs on a HPE Superdome X system.

In each year from 2013 to...
Forum: FermatSearch 2018-12-21, 07:30
Replies: 318
Views: 40,877
Posted By Gary
Congratulations Peter!!!

Congratulations Peter!!!
Showing results 1 to 25 of 52

 
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