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Forum: Factoring 2022-05-11, 08:05
Replies: 429
Views: 84,462
Posted By SethTro
Circa 2020 HP 1455 terminated at step 87:...

Circa 2020 HP 1455 terminated at step 87: http://factordb.com/sequences.php?se=10&aq=1455&action=last20&fr=0&to=100

Circa 2021 HP 3721 terminated at step 205:...
Forum: Prime Gap Searches 2022-04-28, 07:13
Replies: 110
Views: 31,606
Posted By SethTro
primecert v2

Michiel had some excellent suggestions about updating the "primecert" column to more than

"C" - certified
"P" - probabilistic
"?" - unverified

In short they suggest adding, P (proven), D...
Forum: Prime Gap Searches 2022-04-13, 06:30
Replies: 110
Views: 31,606
Posted By SethTro
I committed some old code I had worked on verify...

I committed some old code I had worked on verify (using ecpp-dj and sage's ecpp) the endpoints of small gaps.
This is a dual verification that it's easy to run on the small gaps.

I don't have a...
Forum: Prime Gap Searches 2022-04-11, 16:51
Replies: 110
Views: 31,606
Posted By SethTro
I believe this happens when the server (AKA: my...

I believe this happens when the server (AKA: my computer) doesn't fully verify the gap.

There's some discussion in Prime Gap News (see #126...
Forum: Lone Mersenne Hunters 2022-04-11, 05:05
Replies: 2,133
Views: 313,530
Posted By SethTro
Found two factors for a TWOK candidate. one...

Found two factors for a TWOK candidate. one factor in stage one, one factor in stage two.
Both were missed by a 2003 P-1; both could be found with small B1, B2 so the large B2 from 30.8 was a little...
Forum: Data 2022-04-07, 20:18
Replies: 1,401
Views: 175,688
Posted By SethTro
Big plus one from me. I'm on 19.4M with ETA...

Big plus one from me.

I'm on 19.4M with ETA 5 days, so I think 15.2M will probably probably be the last range
Forum: Factoring 2022-04-03, 06:22
Replies: 143
Views: 14,566
Posted By SethTro
This is expected. I'm balancing binary size and...

This is expected. I'm balancing binary size and compile time vs range of numbers that can be tested.

If you want to run ECM on numbers > 1020 bits look around line 670 in cgbn_stage1.cu
Forum: Lone Mersenne Hunters 2022-03-26, 05:11
Replies: 2,133
Views: 313,530
Posted By SethTro
M19414627 has a factor:...

M19414627 has a factor: 259213687242140687678761255384193 (107.676 bits)

My largest factor in the last few months and it was found in stage 1 with B1=800,000!
Forum: mersenne.ca 2022-03-25, 19:33
Replies: 915
Sticky: mersenne.ca
Views: 120,057
Posted By SethTro
11 minutes from post to fix. James provides...

11 minutes from post to fix. James provides better support than any services I've ever used :)
Forum: mersenne.ca 2022-03-25, 19:20
Replies: 915
Sticky: mersenne.ca
Views: 120,057
Posted By SethTro
For just this one exponents the "Estimated...

For just this one exponents the "Estimated T-Level:" is missing. https://www.mersenne.ca/exponent/1000619
Forum: Software 2022-03-22, 03:03
Replies: 583
Views: 42,517
Posted By SethTro
Ryzen 3 3900X, 48GB ram, 1 worker 8 cores, Ubuntu...

Ryzen 3 3900X, 48GB ram, 1 worker 8 cores, Ubuntu 20.04 mprime 30.8b11
Ryzen 3 3900X, 48GB ram, 1 worker 4 cores, Ubuntu 20.04 mprime 30.8b11


[Work thread Mar 21 15:46] P-1 on M19409329 with...
Forum: Data 2022-03-21, 21:21
Replies: 1,401
Views: 175,688
Posted By SethTro
I'm working on 19.4 But I'm a little worried. ...

I'm working on 19.4 But I'm a little worried.

I've completed 175 P-1 at B1=800K B2=780M which is roughly a 7.2% chance of factor (https://www.mersenne.ca/exponent/19400573). Accounting for the...
Forum: Factoring 2022-03-17, 08:55
Replies: 143
Views: 14,566
Posted By SethTro
Fun fact if you follow the advice about custom...

Fun fact if you follow the advice about custom kernel size you can potentially make this an additional 40% faster


$ echo...
Forum: GMP-ECM 2022-03-17, 08:42
Replies: 517
Views: 146,202
Posted By SethTro
I'm happy to look at this as a bug. I vaguely...

I'm happy to look at this as a bug. I vaguely remember that I wasn't sure if I should always stop or only if the cofactor is composite.
Forum: Factoring 2022-03-08, 20:46
Replies: 143
Views: 14,566
Posted By SethTro
TL;DR If you are still running B2 you should...

TL;DR If you are still running B2 you should probably set B1 for each t-level based on this chart (https://members.loria.fr/PZimmermann/records/ecm/params.html) then round number of curves to the...
Forum: Factoring 2022-03-08, 06:53
Replies: 143
Views: 14,566
Posted By SethTro
This isn't documented anywhere, but if we talk...

This isn't documented anywhere, but if we talk through some good notes here I'll happily write them up and include them after the program runs. This is doing the same thing you are with runecmCGBN,...
Forum: Factoring 2022-03-07, 22:43
Replies: 143
Views: 14,566
Posted By SethTro
You can run `./gpu_throughput_test.sh` from the...

You can run `./gpu_throughput_test.sh` from the gmp-ecm folder and it should test with many different multiples of the default (1/4x, 1/2x, 1x, 2x, 4x, 8x). If the default 1x curves is bad It takes...
Forum: GMP-ECM 2022-03-07, 18:01
Replies: 517
Views: 146,202
Posted By SethTro
There's also some code under multiecm.c...

There's also some code under multiecm.c (https://gitlab.inria.fr/zimmerma/ecm/-/blob/master/multiecm.c) in gmp-ecm. I've never used it (I prefer Wraith's ecm.py), the header is


/* multiecm.c -...
Forum: Factoring 2022-03-06, 23:51
Replies: 143
Views: 14,566
Posted By SethTro
IFAIK you don't need to compile CGBN (or setup...

IFAIK you don't need to compile CGBN (or setup the googletest), you just need the folder downloaded ("cloned") from Github.
Forum: Factoring 2022-03-06, 19:26
Replies: 143
Views: 14,566
Posted By SethTro
"Getting" CGBN should be `git clone...

"Getting" CGBN should be `git clone https://github.com/NVlabs/CGBN.git` which will create a new directory "CGBN" then the commands chris2be8 wrote (thanks) should work.

I got access to contribute...
Forum: Prime Gap Searches 2022-02-23, 06:30
Replies: 110
Views: 31,606
Posted By SethTro
Congrats Michiel! You have always lead the search...

Congrats Michiel! You have always lead the search for megagaps!
Forum: Data 2022-01-29, 10:00
Replies: 108
Views: 6,144
Posted By SethTro
Ethan I would suggest not working below 8K, those...

Ethan I would suggest not working below 8K, those numbers have had substantial ECM by Ryan and I would be amazed if you found any factor below 200 bits.
Forum: Software 2022-01-19, 21:01
Replies: 583
Views: 42,517
Posted By SethTro
After benchmark other threads didn't restart ...

After benchmark other threads didn't restart


I was running 1 worker with 8 threads and htop was showing 800% cpu usage this morning it's showing 1 thread at 100% cpu usage



[Work thread...
Forum: mersenne.ca 2022-01-13, 20:22
Replies: 915
Sticky: mersenne.ca
Views: 120,057
Posted By SethTro
Exactly this; One reason mfaktc doesn't produce a...

Exactly this; One reason mfaktc doesn't produce a NF result if it finds a composite factor (and the server rejects the composite factor result) so I manually produced many NF results for ranges I had...
Forum: Data 2022-01-13, 01:36
Replies: 1,401
Views: 175,688
Posted By SethTro
This is a non-issue, PRP is when the remaining...

This is a non-issue, PRP is when the remaining factor is probably prime implies there is already at least one factor known.
It's harder to avoid Mersenne primes where no factor exists (and no amount...
Showing results 1 to 25 of 432

 
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