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Search: Posts Made By: axn
Forum: Software 2022-05-28, 14:33
Replies: 5
Views: 168
Posted By axn
We store about 18 bits per IEEE fp64, so it is...

We store about 18 bits per IEEE fp64, so it is more lime 6-7M. But I guess that just strengthens your case.


Modern processors can do 8-16 floating point ops/cycles (including muls & adds). Data...
Forum: Software 2022-05-27, 05:03
Replies: 639
Views: 103,021
Posted By axn
No. Only (p, 2p+1) is SG When...

No. Only (p, 2p+1) is SG



When p=k*2^n-1, 2p+1 = k*2^(n+1)-1. Both are easily provable by LLR.
When p=k*2^n+1, 2p+1 = k*2^(n+1)+3, but is still provable, since, by definition, we have 100%...
Forum: Lone Mersenne Hunters 2022-05-23, 17:17
Replies: 2,145
Views: 315,810
Posted By axn
Nice!

Nice!
Forum: Soap Box 2022-05-23, 01:54
Replies: 34
Views: 709
Posted By axn
(-3.88, -4.92)

(-3.88, -4.92)
Forum: Software 2022-05-23, 01:35
Replies: 591
Views: 44,170
Posted By axn
Precisely.

Precisely.
Forum: Software 2022-05-22, 16:48
Replies: 591
Views: 44,170
Posted By axn
It is. But the essential nature of stage 2...

It is. But the essential nature of stage 2 remains, i.e. k must have one factor between B1 & B2. That doesn't change just because you checked for the factor (i.e. did a gcd) multiple times during...
Forum: Software 2022-05-22, 15:58
Replies: 591
Views: 44,170
Posted By axn
2*k*p+1 Yes, but not specific to 30.8 ...

2*k*p+1


Yes, but not specific to 30.8

It is not so much a problem as it is a limitation of the P-1 algorithm.


For smaller exponents, this shouldn't cost much. But how would this help...
Forum: Software 2022-05-22, 04:41
Replies: 591
Views: 44,170
Posted By axn
3885489 = 3^4* 47969 is not a prime, so gimps...

3885489 = 3^4* 47969 is not a prime, so gimps doesn't track this number. Clearly something went wrong in the assignment itself.

The closest matching prime exponent with no factors is 3885487
Forum: Miscellaneous Math 2022-05-14, 09:20
Replies: 565
Views: 66,052
Posted By axn
What is wrong with you! You have some weird...

What is wrong with you! You have some weird ideas about other people. And math. And probabilities.
Forum: Information & Answers 2022-05-12, 15:14
Replies: 12
Views: 299
Posted By axn
Cool, that's sorted, then. :tu:

Cool, that's sorted, then. :tu:
Forum: GPU Computing 2022-05-12, 12:25
Replies: 7
Views: 481
Posted By axn
K80 produces 110 GHz D/d on PRP tests. It...

K80 produces 110 GHz D/d on PRP tests. It produces 800 GHz D/d on TF.

If factoring is what you want to do, GTX 16xx, RTX 20xx and RTX 30xx are the things to get. For example, 1650 produces 800...
Forum: Information & Answers 2022-05-12, 02:31
Replies: 12
Views: 299
Posted By axn
I suppose that is a sensible interpretation...

I suppose that is a sensible interpretation too... Just not sure that is what OP meant... Anyway, maybe there is some value to this tangent for OP
Forum: Information & Answers 2022-05-12, 02:25
Replies: 12
Views: 299
Posted By axn
Isn't it the former? i.e. How many hours the...

Isn't it the former? i.e. How many hours the program will run as opposed to how many hours the human is sitting in front of the computer? I am not sure I understood the OP's question correctly, but...
Forum: Software 2022-05-11, 15:14
Replies: 591
Views: 44,170
Posted By axn
Doesn't make sense. WIth PFactor, the bounds are...

Doesn't make sense. WIth PFactor, the bounds are determined by the number of tests saved. If it already has a factor, then why bother? Pminus1 has exactly what you need.
Forum: mersenne.ca 2022-05-11, 09:58
Replies: 917
Sticky: mersenne.ca
Views: 120,798
Posted By axn
Not that I'm aware of. I am aware of one...

Not that I'm aware of. I am aware of one condition under which it outputs composite factor, which is when the composite factor is of the correct size. Eg:- Suppose a number has a 35-bit and 40-bit...
Forum: mersenne.ca 2022-05-11, 02:15
Replies: 917
Sticky: mersenne.ca
Views: 120,798
Posted By axn
Considering the fact that a) TF doesn't find...

Considering the fact that a) TF doesn't find composite factors (outside the bit depth), b) the factors are P-1 smooth, and c) missed another factor in the range, this is almost certainly a P-1 find.
Forum: PrimeNet 2022-04-29, 17:33
Replies: 8
Views: 466
Posted By axn
mersenne.org doesn't give this information....

mersenne.org doesn't give this information. mersenne.ca does: https://www.mersenne.ca/exponent/900011207

But those are the limits, not the actual TF already done.

The fact that you were given...
Forum: Software 2022-04-24, 10:14
Replies: 591
Views: 44,170
Posted By axn
30.8 uses a bigger FFT for stage 2. This...

30.8 uses a bigger FFT for stage 2. This information is included in the submitted result, so the server grants bigger credit. Obviously the difference in credit is dependent on the difference in FFT...
Forum: Software 2022-04-24, 07:55
Replies: 591
Views: 44,170
Posted By axn
I am not sure what the relevance of this...

I am not sure what the relevance of this observation is to the quoted part (about credit calculation being done server-side).
Forum: PrimeNet 2022-04-22, 03:36
Replies: 11
Views: 589
Posted By axn
True, but 30.8 still yields much larger ratios...

True, but 30.8 still yields much larger ratios compared to 30.7 even at wavefront, especially if you throw something like 50GB at it. Maybe 200x-300x instead of 30x-40x?
Forum: PrimeNet 2022-04-21, 14:49
Replies: 11
Views: 589
Posted By axn
You have not allocated sufficient RAM for P-1...

You have not allocated sufficient RAM for P-1 stage 2. Change the setting from the default 300 MB to as much RAM as you can spare. That will cause it to do proper stage 2.
Forum: Information & Answers 2022-04-21, 03:37
Replies: 17
Views: 1,456
Posted By axn
I have move this thread to the correct forum. ...

I have move this thread to the correct forum.



On the contrary... While going thru reference info is an excellent advise, people have lives. When they need to find information quickly, asking a...
Forum: Software 2022-04-20, 02:08
Replies: 591
Views: 44,170
Posted By axn
Credit calculation is done server-side. Nothing...

Credit calculation is done server-side. Nothing can be done on the client side. You're perhaps confusing it with improved "cost estimation" which is needed to select optimal P-1 bounds.
Server logic...
Forum: Data 2022-04-18, 17:01
Replies: 1,401
Views: 177,177
Posted By axn
Is there any reason to think that SRBase's work...

Is there any reason to think that SRBase's work won't be sufficient?
Forum: Data 2022-04-18, 02:44
Replies: 134
Views: 8,807
Posted By axn
I believe, if you specify TF depth, it will...

I believe, if you specify TF depth, it will ignore the given B2 and compute the optimal


We're trying to account for the ECM done on the exponent to more accurately do the probability/bounds...
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