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Search: Posts Made By: nordi
Forum: PrimeNet 2021-11-21, 17:39
Replies: 4
Views: 258
Posted By nordi
But it is also not disproven by it, so the...

But it is also not disproven by it, so the example is quite pointless. Please take masser's advise and search the forum, there has been in depth analysis of TJAOI's work.

This is incorrect, as...
Forum: Software 2021-11-19, 21:36
Replies: 22
Views: 603
Posted By nordi
Thanks a LOT! Since I'm lazy, I automated steps...

Thanks a LOT! Since I'm lazy, I automated steps II and III with some Python (version 3.6 or higher) code:

# fill in these 3 values:
b1 = 1000000
exponent = 5273
known_factors = [38134337,...
Forum: Software 2021-11-19, 18:14
Replies: 22
Views: 603
Posted By nordi
I know there's instructions for doing this with...

I know there's instructions for doing this with ECM, but didn't know it would be possible for P-1. It sounds really interesting, but all I could find from Kriesel was this...
Forum: Math 2021-11-17, 23:18
Replies: 9
Views: 2,131
Posted By nordi
I originally found this factor using mprime, not...

I originally found this factor using mprime, not gmp-ecm. I'm not sure if the Sigma values are "compatible", i.e. if the same Sigma yields the same result in both programs. I have no idea about Bur's...
Forum: Software 2021-11-09, 19:35
Replies: 138
Sticky: Prime95 30.7
Views: 11,192
Posted By nordi
RESOLVED Turns out I mis-edited my worktodo.txt...

RESOLVED
Turns out I mis-edited my worktodo.txt to read "Pminus1=N/A,2,11996279,-1" instead of "Pminus1=N/A,1,2,11996279,-1". That makes mprime crash. I guess that shouldn't happen either, but at...
Forum: Information & Answers 2021-11-07, 23:53
Replies: 69
Views: 9,916
Posted By nordi
I did run benchmarks...

I did run benchmarks (https://www.mersenneforum.org/showthread.php?p=592678#post592678) for that now: Running step 2 on all CPU threads leads to a 13.2% increase in throughput. Of course, this also...
Forum: GMP-ECM 2021-11-07, 23:14
Replies: 4
Views: 2,671
Posted By nordi
I also benchmarked Step 2 on my AMD Ryzen 9...

I also benchmarked Step 2 on my AMD Ryzen 9 3950X, using M1217 and B2=1e13 for Step 2 to answer two questions:


does it make sense to run Step 2 on every CPU thread?
does it make sense to run...
Forum: Information & Answers 2021-11-05, 17:43
Replies: 69
Views: 9,916
Posted By nordi
I took a look at the "CPU timing" section of the...

I took a look at the "CPU timing" section of the README, and I think you are underestimating the CPU speed for stage 1 by a factor of 2 because you do not take hyperthreading into consideration. I...
Forum: Hardware 2021-11-05, 12:50
Replies: 42
Views: 3,212
Posted By nordi
What do you mean? The y-cruncher results show...

What do you mean? The y-cruncher results show Alder Lake in the lead (https://cdn.mos.cms.futurecdn.net/PkwrfgFWwdtSm3LvSWn2kg-970-80.png.webp), especially with DDR-5 RAM.
Forum: Lone Mersenne Hunters 2021-10-31, 13:58
Replies: 1,985
Views: 270,462
Posted By nordi
M260543 has a 102.431-bit (31-digit) factor:...

M260543 has a 102.431-bit (31-digit) factor: 6833981637847127989838565387041 (https://www.mersenne.ca/M260543) (ECM,B1=1000000,B2=162000000,Sigma=3342767857012760)
That's the 9th known factor,...
Forum: Software 2021-10-03, 13:53
Replies: 138
Sticky: Prime95 30.7
Views: 11,192
Posted By nordi
I noticed that for ECM on small exponents, stage...

I noticed that for ECM on small exponents, stage 2 init now takes a lot longer than before


version 30.6b4

[Worker #4 Oct 3 11:59] ECM on M20393: curve #264 with s=652720576976964, B1=3000000,...
Forum: Linux 2021-09-21, 15:39
Replies: 7
Views: 809
Posted By nordi
You can get that with from collections...

You can get that with

from collections import Counter
with open("FILE_NAME") as f:
counter = Counter(line.rstrip() for line in f)

for composite, count in counter.most_common(10000):
...
Forum: Linux 2021-09-20, 18:09
Replies: 7
Views: 809
Posted By nordi
In that case you can use the following Python...

In that case you can use the following Python script:

from collections import Counter
with open("YOUR_FILE_NAME") as f:
print(Counter(line.rstrip() for line in f).most_common(10000))
Forum: Lone Mersenne Hunters 2021-08-20, 11:39
Replies: 1,985
Views: 270,462
Posted By nordi
M1897121 has a 77.294-bit (24-digit) factor:...

M1897121 has a 77.294-bit (24-digit) factor: 185310913945752397948441 (https://www.mersenne.ca/M1897121) (ECM,B1=50000,B2=6750000) <-- the 9th known factor
M194653 has a 119.349-bit (36-digit)...
Forum: Hardware 2021-06-02, 18:51
Replies: 15
Views: 1,413
Posted By nordi
This graphic...

This graphic (https://images.anandtech.com/doci/16214/Zen3_arch_20.jpg) from Anandtech's Zen3 deep dive shows "32B / cycle" as L3 bandwith per core. At 4Ghz, that's 128GB/s, which is in line with...
Forum: mersenne.ca 2021-05-18, 18:29
Replies: 719
Sticky: mersenne.ca
Views: 96,460
Posted By nordi
It is possible. The new factors for M1,924,751...

It is possible. The new factors for M1,924,751 (https://www.mersenne.ca/exponent/1924751) and M92,419 (https://www.mersenne.ca/exponent/92419) are P+1 smooth and also reasonably P-1 smooth.
Forum: Data 2021-05-05, 22:17
Replies: 119
Views: 10,109
Posted By nordi
That would explain ...

That would explain
https://www.mersenne.ca/exponent/399953

I also seems that some P-1 has been done up to 500k:
https://www.mersenne.ca/exponent/499679
https://www.mersenne.ca/exponent/499649
...
Forum: Data 2021-05-01, 16:20
Replies: 119
Views: 10,109
Posted By nordi
I did a test run on exponents with known factors...

I did a test run on exponents with known factors in the 90-100k and 295-305k ranges. I made 2 runs on the 1393 exponents in these ranges: First with start=2/7, then with start=6/5. The run just...
Forum: Software 2021-05-01, 15:46
Replies: 480
Views: 55,629
Posted By nordi
One number is actually missing from the P+1...

One number is actually missing from the P+1 report (https://www.mersenne.org/report_pplus1/): a factor was found for M92459 (https://www.mersenne.org/report_exponent/?exp_lo=92459&full=1) . It was...
Forum: Software 2021-04-30, 17:00
Replies: 480
Views: 55,629
Posted By nordi
Maybe you should try "UnreserveExponents=999",...

Maybe you should try "UnreserveExponents=999", which does the opposite of what the name implies: It protects 999 exponents per worker from bein unreserved. I set it on my system because mprime kept...
Forum: Data 2021-04-29, 22:45
Replies: 119
Views: 10,109
Posted By nordi
This factor is actually so P+1 smooth that it was...

This factor is actually so P+1 smooth that it was found in stage 1:

543259182333011804411673092327891767 + 1 = 2 x 2 x 2 x 11 x 6133 x 78173 x 411667 x 758189 x 1997101 x 20657183

That's why...
Forum: Data 2021-04-28, 21:48
Replies: 119
Views: 10,109
Posted By nordi
Out of those numbers, I already did all exponents...

Out of those numbers, I already did all exponents in the 90k-100k and 295k-305k range as an experiment. The second run on those is already in progress. So please remove them from the list / don't...
Forum: mersenne.ca 2021-04-23, 13:17
Replies: 719
Sticky: mersenne.ca
Views: 96,460
Posted By nordi
@James: Maybe you are just doing some testing...

@James: Maybe you are just doing some testing right now, but https://www.mersenne.ca/exponent/287873 shows some debug info that probably should not be there.
Forum: Software 2021-04-23, 11:15
Replies: 480
Views: 55,629
Posted By nordi
Another two factors found with P+1. One is P-1...

Another two factors found with P+1. One is P-1 smooth:

M1601783 (https://www.mersenne.org/report_exponent/?exp_lo=1601783&full=1): 5920048152491971978196689064497 - 1 = 2^4 x 3 x 191 x 6637 x...
Forum: mersenne.ca 2021-04-22, 22:20
Replies: 719
Sticky: mersenne.ca
Views: 96,460
Posted By nordi
Regarding the B1/B2 choice, available RAM is...

Regarding the B1/B2 choice, available RAM is currently the limit for me. I chose B1 as 40 times the B1 of the current ECM work and B2 = 50 * B1. In stage 2, that uses 2GB for already factored...
Showing results 1 to 25 of 87

 
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