Topic: [1500 TH] p2pool: Decentralized, DoS-resistant, Hop-Proof pool - page 712. (Read 2591919 times)

I threw my little farm at it for an hour or so to test something, may be back soon.

It seems to be bouncing around today.  Saw a high of 380 earlier then it fell down to 330 ish then popped back up to 400.  I guess some new users are trying it out.

I don't know what you guys are doing but p2pool is at 401Gh/s right now, and today was like always at 380-390



Keep up the good work!

Well I edited my reply - but you posted too fast
My example was just about stop mining.
I guess I ignored the start mining again bit - which (yes I agree) means it's simply just the amount of time he mines.

Hmm - well - then I guess my example is wrong/bad coz we aren't referring to a case of stop mining permanently.
OK ignore me then

I get that it was your point but it is still wrong.

Nothing is lost.  Saying the amount of time mined and you gain nothing is a fallacy.  Also stopping right after you find a share or block to minimize "lost work" is also a fallacy.  The very next hash could just as likely be another share or block.

Still the issue you were "helping" with had nothing to do with granularity.  The user wasn't mining for HOURS.  In any PPLNS or DGM pool his compensation likely would have been ZERO.  p2pool due to the fact that it has n = ~4.5 kept shares earned in the last 24 hours and resulted in some compensation.

Nope, that was the point of my example.
It's to do with when you stop mining and the average expected amount of time you will mine and gain nothing for it.
(which will be - on average half the average expected time it takes to find a share)

Edit: yes of course if you resume mining the total expected shares is still based on the time you mine - I'm just referring to if you stop mining.

That would be true if you worked TOWARDS a share.  However you don't each hash is independent.  Randomly turning your computer on and off wouldn't affect your payout on 1 diff shares vs 1000 diff shares as long as the "on time" is the same.  If you were on 50% you would in the long run earn 50% regardless of the share size.

I can name no pool where he would be compensated for not mining.
Though DGM will compensate you after you stop - but that's for mining you have already done.
Edit: hmm though that's similar to p2pool in the respect of being paid for your work after you stop anyway.

As for compensation - well that's an easy one to explain.
It's called granularity (and rounding) when things change.

Say there's 10,000 items - in groups of 10 and each group takes 10s to find.
If I get 1 for every group I find I will of course get 1,000 if I find all of them and it will take 10,000s.

Say there's 10,000 items - in groups of 1,000 and each group takes 1,000s to find.
If I get 100 for every group I find I will of course still get 1,000 if I find all of them and it will take 10,000s again.

However, if I stop collecting 500s before I find them all what will I get?
In the first case I will get 950
In the second case I will get 900

Meaning of all this?
When you stop mining, the amount of time you spent on getting nothing (wasted) will on average be half the time for you to find a share unless you plan waiting and stopping WHEN you find a share.
For P2Pool the amount of wasted time will of course average out to be the P2Pool difficulty times more than a 1 difficulty pool for your hash rate.

All that above is of course what I was referring to

Kano: Central limits theorem.

:-)

Ente

That is just weak. Name me a pool where he would have been compensated for NOT mining?

He wasn't mining, it isn't like he had a 10 minute reboot window and lost 100% of the block value for 3 blocks.  He still got credit on each block for the portion of time he was mining in the last 24 hours.  The n used by p2pool is ~4.  Most pools PPLNS pools use an n of ~1.  There is no pool under a similar scenario where he would have been compensated more.

um...

average out to 3.5 ... not 3

otherwise, correct

although, with dice, you're always there for each roll you make, so all of the luck is your own, good or bad... since the numbers in BTC continue to keep rolling whether you're playing or not, you could conceivably, consistently miss out on the good luck periods, and stay in on the bad luck periods. You'd never know when those periods come up tho, so that is another level of luck.


-- Smoov

There is no memory in bitcoin hashing.

Exactly!
That is exactly why it evens out after some time.
If you roll dice, and have a particulary unlucky streak with four "1" in a row, that is bad luck. And happens quite rarely too. But as you go on, after some time, you will eventually hit four "6" in a row. Then it will have evened out. Sure, you will have dozens of "three 1" and "three 6" in between, maybe even another "four 1" too. But if you roll long enough, and the dice *really* dont remember anything (i.e. not broken or manipulated), you will eventually have an average of exactly 3. It may take a few hundreds or many thousands of rolls, depending on how many decimals you want to converge to "3".

Anyway, I think we are talking about the same here ;-)

(And to me it is not entirely sure yet that the *whole* p2pool setup is working entirely as expected and calculated. There seem to be an additional, constant small-% loss in the way.. observing the "luck.png" graphs..)

Ente

Actually ... no it doesn't.
If you lose out in a good luck spree there is no guarantee whatsoever that you will get it back later.
There is no memory in bitcoin hashing.

..let me know a few hours before your rig goes down, next time, ok? I would like a "warning, blockfinding-spree ahead!" warning system! ;-)

It all evens out after some time.

Ente

The reason why pools exist in the first place - to reduce variance.
P2Pool just happens to reduce it way less than the other pools.

Just my fucking luck...  My dedicated miner runs for 10 days straight without issue, and on the day that p2pool finds a billion blocks, I come back to a rig that won't give video. Restart and everything is fine and dandy again. WTF is that?!?! It's like every 10-12 days this shit happens and on the day p2pool has good luck, my share count is 1/6 what it typically is. 

5 blocks in 8 hours

3 blocks in less than 30 minutes ? Is it Christmas already ?

we just got 4 blocks in a small amount of time