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Old 2021-03-15, 17:07   #1816
axn
 
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Quote:
Originally Posted by storm5510 View Post
My son has a Ryzen 5 3600. 6 cores / 12 threads. Why only one core?
1 core per worker, 6 workers, all running P-1.

EDIT:- What Viliam said.

Last fiddled with by axn on 2021-03-15 at 17:11
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Old 2021-03-17, 18:22   #1817
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Quote:
Originally Posted by axn View Post
1 core per worker, 6 workers, all running P-1.

EDIT:- What Viliam said.
Ah, I get it now. I have done something similar with Prime95 in the past, but not to this extent. 2 workers using 2 cores each on an i7. IIRC, each worker will use the memory setting in local.txt. In my case, it was 4,096. 8,192 for both.
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Old 2021-03-18, 04:50   #1818
petrw1
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Default Not a big factor but just barely at a new TF bit level

28385759
Factor: 4728836973118701446897 / TF: 72-73*
72.002 Bits!!!
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Old 2021-03-18, 05:37   #1819
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Quote:
Originally Posted by petrw1 View Post
28385759
Factor: 4728836973118701446897 / TF: 72-73*
72.002 Bits!!!
I'm guessing that was worth about 0.001 GHz-days
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Old 2021-03-18, 11:11   #1820
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M27142097 has a 174.143-bit (53-digit) composite (P27+P27) factor: 26436212642162007070517822654531755460254859231089553 (P-1,B1=1350000,B2=109350000)
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Old 2021-03-18, 14:16   #1821
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Quote:
Originally Posted by slandrum View Post
I'm guessing that was worth about 0.001 GHz-days
Mfaktc (and most factoring programs) don't look for factors in order of bitsize but by class spread throughout the target range. In this case the factor is found in class 3412 (of 4620) so it took ~74% of the full-range effort to find even though it happened to be right at the bottom of the range.
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Old 2021-03-18, 15:10   #1822
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Quote:
Originally Posted by slandrum View Post
I'm guessing that was worth about 0.001 GHz-days
0.0666 (Diabolical)

Quote:
Originally Posted by James Heinrich View Post
Mfaktc (and most factoring programs) don't look for factors in order of bitsize but by class spread throughout the target range. In this case the factor is found in class 3412 (of 4620) so it took ~74% of the full-range effort to find even though it happened to be right at the bottom of the range.
74% of the work for 0.2% of the credit.
That's ok sometimes it's the other way around.
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Old 2021-03-18, 15:14   #1823
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Quote:
Originally Posted by petrw1 View Post
74% of the work for 0.2% of the credit.
That's ok sometimes it's the other way around.
I couldn't remember (and didn't bother to look up) if mersenne.org gives proper class-based credit or just takes the lazy approach, apparently it's the latter. For an individual assignment it's unfair, but on average as you say it all balances out.
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Old 2021-03-18, 17:38   #1824
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IIRC, I asked this in the past, as I got some minuscule credit, close to zero, for a factor and I couldn't figure out why, as it was not on one of the first classes, mfaktc still had to do some work to get the factor. I think George replied something along the lines that PrimeNet gives TF credit class-based, except that the classes are P95-like, and not mfaktc-like. P95 splits the classes differently, whatever that means, maybe he can clarify. On average, this doesn't matter. As Wayne said, sometimes that is the other way around.

Last fiddled with by LaurV on 2021-03-18 at 17:42
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Old 2021-03-18, 17:55   #1825
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Quote:
Originally Posted by LaurV View Post
P95 splits the classes differently, whatever that means, maybe he can clarify.
I believe Prime95 uses 420 classes whereas mfaktx uses 4620 classes (except for the less-classes version/setting when it also uses 420).
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Old 2021-03-18, 18:05   #1826
LaurV
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Well, it could be easily checked in which class the factors were, in both cases.
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