[XPM] [ANN] Primecoin High Performance | HP14 released!

[mikaelh]

I updated the FAQ in my first post a bit. Most importantly I added the revised blocks/day formula there.

The revised formula is:
blocks/day = chains/day * (1 - fracDiff + 0.035)

Note that the old formula is still used in many places like the bot on Freenode and Anty's website.

[Trillium]

I hope you're all enjoying your new chainsperday values 

[mikaelh]

Yup, the Primecoin network has finally reached difficulty 10. Chains/day values should be about 27 times lower now. This is to be expected because chains/day is now trying to predict how many 10-chains will be found.

[Trillium]

Yup, the Primecoin network has finally reached difficulty 10. Chains/day values should be about 27 times lower now. This is to be expected because chains/day is now trying to predict how many 10-chains will be found.

Because the fractional component in diff 10 is still so large (>99%) as expected the daily mining reward is essentially the same. We'll see how its going when it 'stabilizes'. I see on your charts its more or less a vertical trace at the moment (probably will be for the first day).

[mhps]

That vertical-turns-into-horizontal shape is a confusing artifact of the 1/x function as real difficulty x changes at a constant rate. The fractional difficulty should have been defined as x -- how difficult it is to find a valide N-chain.

[maco]

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[6strings]

So with the diff change to 10+ now do we still use the default parameters when solo mining?
Or should there be some changes to optimize the process?

[ivanlabrie]

So with the diff change to 10+ now do we still use the default parameters when solo mining?
Or should there be some changes to optimize the process?

Good question, and how do you apply the new formula mikaelh posted?

Say I have 0.433335 cpd...I get something like this (which makes no sense): 0,43335 * (1 - 10.1326 + 0.035)

huh O.o 

[glongsword]

So with the diff change to 10+ now do we still use the default parameters when solo mining?
Or should there be some changes to optimize the process?

Good question, and how do you apply the new formula mikaelh posted?

Say I have 0.433335 cpd...I get something like this (which makes no sense): 0,43335 * (1 - 10.1326 + 0.035)

huh O.o 

Fractional diff is the diff minus the integer part, so your formula should read 0.43335 * (1-.1326+0.035) = 0.39105504

[Trillium]

Yeah you leave the "10" (integer) part off:  10.1326 becomes 0.1326

As for if parameters should be changed, well someone smarter than me will need to weigh in for that. 

[ivanlabrie]

So with the diff change to 10+ now do we still use the default parameters when solo mining?
Or should there be some changes to optimize the process?

Good question, and how do you apply the new formula mikaelh posted?

Say I have 0.433335 cpd...I get something like this (which makes no sense): 0,43335 * (1 - 10.1326 + 0.035)

huh O.o 

Fractional diff is the diff minus the integer part, so your formula should read 0.43335 * (1-.1326+0.035) = 0.39105504

Thanks guys! Silly me, fractional...duh, was there all along xD

So, my theoretical dual xeon rig should get 0.4 blocks/day roughly. Interesting :p

[mhps]

I think neither the input nor formula are applicable any more --  the formula is for diff < 10 only, and the current chain/d numbers are calculated for target=9chains, hence not valid any more.

[mikaelh]

Yes, the previous blocks/day formula was written with difficulty 9.99 in mind. This is the slightly more complicated version which is accurate for lower fractional difficulty:

blocks/day = chains/day * (0.965 * (1 - fracDiff) + 0.035)

I haven't checked yet whether the constants (0.965 and 0.035) still apply for difficulty 10. Of course, this formula only applies for the new chains/day values.

Right now at difficulty 10.15, mining should be about 22% harder than it was at 9.996. Difficulty 10.0 is about 5% harder than 9.996 in theory. The block reward has also dropped by 3%. And about 15% of 10-chains are discarded due to fractional difficulty.

I haven't checked what the new optimal mining parameters are. The old ones should still be pretty good. It might be beneficial to increase -sieveextensions.

[Amph]

I hope you're all enjoying your new chainsperday values  

now it is faster to make block or what?

[Trillium]

I hope you're all enjoying your new chainsperday values  

now it is faster to make block or what?

No, it's harder. Difficulty has been continously rising since passing 10 diff too.

[Amph]

why primecoin calculator say otherwise then?it say 33 days with my cycle, before that change, the time was 100+days to found a block...

[mikaelh]

why primecoin calculator say otherwise then?it say 33 days with my cycle, before that change, the time was 100+days to found a block...

Many of the calculators are still using outdated formulas. They give bad estimates when fractional difficulty is high. So the 100+ days estimate you got earlier was way too high. It should have been less than 30 days in reality.

[PabloW]

I have a i5 2500k is this chansperday too low?



{
"blocks" : 317954,
"chainspermin" : 4,
"chainsperday" : 0.04937416,
"currentblocksize" : 4996,
"currentblocktx" : 8,
"difficulty" : 10.15431237,
"errors" : "",
"generate" : true,
"genproclimit" : -1,
"primespersec" : 1515,
"pooledtx" : 8,
"sieveextensions" : 9,
"sievepercentage" : 10,
"sievesize" : 1000000,
"testnet" : false
}

[cryptrol]

I have a i5 2500k is this chansperday too low?

{
"blocks" : 317954,
"chainspermin" : 4,
"chainsperday" : 0.04937416,
"currentblocksize" : 4996,
"currentblocktx" : 8,
"difficulty" : 10.15431237,
"errors" : "",
"generate" : true,
"genproclimit" : -1,
"primespersec" : 1515,
"pooledtx" : 8,
"sieveextensions" : 9,
"sievepercentage" : 10,
"sievesize" : 1000000,
"testnet" : false
}

Seems ok now with the new difficulty.

[crytpon]

if I have a chains/day value of 2.7 with N-chain value of 9 what should I expect with N-chain=10?