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Forum: And now for something completely different 2021-05-09, 06:59
Replies: 51
Views: 2,249
Posted By axn
Based on the clues, I have narrowed it down to: ...

Based on the clues, I have narrowed it down to:
8172707
8177207
8267747
8272787
8367707
8373377
8373767
8549777
8674727
Forum: Software 2021-05-07, 11:56
Replies: 5
Views: 106
Posted By axn
That's the best we can do; we will never get the...

That's the best we can do; we will never get the efficiency of running entirely from L3 cache.

Just so there is no confusion, there is difference between dual rank and dual channel. If you run...
Forum: Software 2021-05-07, 11:32
Replies: 5
Views: 106
Posted By axn
I am assuming that you were doing a single WU...

I am assuming that you were doing a single WU using all 8 cores.

5800X has a 32MB L3 cache. a 3200K FFT takes 3200*1024*8 bytes or 25MB. That will fit within the 32MB L3.

Clearly the 6M FFT,...
Forum: Software 2021-05-07, 09:03
Replies: 13
Views: 358
Posted By axn
Apples and oranges. More RAM wasn't the only...

Apples and oranges. More RAM wasn't the only variable in your test. The P-1 alogrithm also changed drastically between versions. Do comparisons with the same version only.



It is possible. Only...
Forum: Data 2021-05-06, 11:24
Replies: 442
Views: 65,780
Posted By axn
Thumbs up Stick a fork in it, 'cause ...

... 3.4 is done.

Got some help from ECM as the range is now being worked in GIMPS.

Once I'm done with the current batch of P-1 (another 6 days), I'll be moving on to 3.7
Forum: PrimeNet 2021-05-06, 02:16
Replies: 15
Views: 402
Posted By axn
30.3 >= 30.4 ?

30.3 >= 30.4 ?
Forum: PrimeNet 2021-05-05, 17:45
Replies: 15
Views: 402
Posted By axn
You should upgrade your client to version >= 30.4...

You should upgrade your client to version >= 30.4 (latest is 30.6), as those have improved (i.e. much faster) stage 2 and which will use all the memory you can throw at it.
Forum: Data 2021-05-02, 09:56
Replies: 442
Views: 65,780
Posted By axn
There has been no activity (factors found and/or...

There has been no activity (factors found and/or exponents TF'ed) in the last 60 days in that region: https://www.mersenne.ca/status/tf/0/60/5/2690
Forum: Cloud Computing 2021-04-30, 11:25
Replies: 14
Views: 433
Posted By axn
Crunching on on-demand/reserved instances is cost...

Crunching on on-demand/reserved instances is cost prohibitive. But spot instances are much more affordable.
Forum: PrimeNet 2021-04-29, 09:13
Replies: 2,148
Views: 211,047
Posted By axn
Do you mean 2021-02-25 Seth_Tr F-PM1 Factor:...

Do you mean
2021-02-25 Seth_Tr F-PM1 Factor: 6932292235325039464332944259181777 / (P-1, B1=10000000000)?

6932292235325039464332944259181777 is a composite factor made up of previously known small...
Forum: Software 2021-04-28, 02:19
Replies: 290
Views: 22,260
Posted By axn
Noone is asking about using P+1 runs instead of...

Noone is asking about using P+1 runs instead of P-1 runs to find P-1 factors. But, sometimes machines makes mistakes and P-1 runs could miss factors. If we're running P+1 anyways, and if it is...
Forum: Software 2021-04-27, 14:34
Replies: 290
Views: 22,260
Posted By axn
Not sure what you mean, but... AVX512 has worse...

Not sure what you mean, but... AVX512 has worse FFT limits compared to FMA3. The error message looks like the same one in that thread, implying that it exceeds largest available FFT size. IIUC, the...
Forum: Software 2021-04-27, 14:26
Replies: 290
Views: 22,260
Posted By axn
I second this request. There is virtually no cost...

I second this request. There is virtually no cost in throwing in a 'p' in the B1 product. If it helps in finding an odd P-1 factor here or there, that is always a win.
Forum: Information & Answers 2021-04-27, 14:20
Replies: 3
Views: 172
Posted By axn
Possibly this thread...

Possibly this thread (https://www.mersenneforum.org/showthread.php?t=26693) can help?
Forum: GMP-ECM 2021-04-25, 18:20
Replies: 6
Views: 515
Posted By axn
That's just the way the math works out. A...

That's just the way the math works out.
A simple intro: https://en.wikipedia.org/wiki/Williams%27s_p_%2B_1_algorithm

The thing that needs to be smooth is p-(D|p). If (D|p) is -1, then p+1. If...
Forum: GMP-ECM 2021-04-25, 17:05
Replies: 6
Views: 515
Posted By axn
Yes. Yes. Suppose a number N...

Yes.



Yes.

Suppose a number N has two smooth prime factors f and g (and other not smooth prime factors, which we don't care about). f is + side smooth, g is - side smooth (i.e. f+1 and g-1...
Forum: Miscellaneous Math 2021-04-25, 03:57
Replies: 24
Views: 622
Posted By axn
Thread closed, per request.

Thread closed, per request.
Forum: Data 2021-04-25, 02:20
Replies: 22
Views: 977
Posted By axn
Yes, but George needs to confirm whether he...

Yes, but George needs to confirm whether he implemented it or not.
Forum: Software 2021-04-24, 14:36
Replies: 290
Views: 22,260
Posted By axn
Could be a bug. However, I am confused about the...

Could be a bug. However, I am confused about the bolded parameter: Pplus1=N/A,1,2,1000033,-1,10000000,250000000,2,1000000000,"6000199"

It is supposed to be the depth of TF in bits. The value...
Forum: Factoring 2021-04-24, 14:05
Replies: 1,829
Views: 166,180
Posted By axn
Thank you!

Thank you!
Forum: Factoring 2021-04-24, 11:10
Replies: 1,829
Views: 166,180
Posted By axn
I believe you're referring to numbers having...

I believe you're referring to numbers having Aurifeuillean factorization. There are special combination of a,b,n which have these formula-based factorizations. They will have (typically) two...
Forum: Software 2021-04-22, 17:23
Replies: 290
Views: 22,260
Posted By axn
Well, someone's confused :wink: c=-1 defines...

Well, someone's confused :wink:

c=-1 defines the number being factored (i.e. Mersenne) and not related to the method of factorization.
Forum: Data 2021-04-22, 17:14
Replies: 442
Views: 65,780
Posted By axn
Understood.

Understood.
Forum: Data 2021-04-22, 11:46
Replies: 442
Views: 65,780
Posted By axn
So after further crunching, I noticed that the...

So after further crunching, I noticed that the GCE machines were producing inconsistent timings. After correcting for it, there was a much more pronounced loss of efficiency (prob/hr) as you go...
Forum: Data 2021-04-22, 10:08
Replies: 442
Views: 65,780
Posted By axn
Cunching the numbers on chalsall's GCE runs: ...

Cunching the numbers on chalsall's GCE runs:
6532 0.321 0.176913655848132
7685 0.364 0.170513988288874
8956 0.401 0.161188030370701
9502 0.437 0.165565144180173

That is Runtime(s), Prob(%),...
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