Re: [POOL][Scrypt][Scrypt-N] Profit switching pool - wafflepool.com
If WafflePool took this same idea, but instead waited for authentication, checked the user's pre-defined algo weights, and rejected/accepted auth based on the best algo, we would have a pretty excellent multi-algo-profit-switching pool =].
I'm very glad that other pools are interested in multi-algo as well. I'm definetly interested in common brainstorming and development in improvments in either stratum protocol or mining software, or both - whatever that could lead into efficient algo switching at miners side. Let's share ideas in the new sgminer thread https://bitcointalk.org/index.php?topic=632503.0 (or somewhere else).
BTW: regarding pre-defined algo weights - well, besides the hashrate ratio which is more or less equal for all miners, the only interesting weight is electrical power consumption. Unfortunatelly, electricity power consumption is not linear to BTC/GH/Day ratio calculation (exponential function with measured staring point should be used, and since miner doesn't know the current price ratio, he can't set power consumption weights). See also this example https://nicehash.com/multialgo/power-factor-calculation_x11.xlsx ... you can play with the numbers and you'll see that it is not trivial... but if you can come out with this logarithmic formula, please, do share it with me
... If we find this formula then we can introduce epp (electricity power price) parameter and evaluate it in the profitability formula.I think you are overcomplicating the power problem. The miner knows (well - needs to know) two facts about each algorithm: hashrate of the rig, and cost to run that rig. Cost to run should be normalized to a certain period - per day would be probably most convenient since we are used to calculating earnings as BTC per MH/s per day. It doesn't have to be just power cost, it could be rental cost or whatever the miner's expense is. So for example a fairly common GPU rig of 4x 280X would be:
X11: 12 MH/s, 0.002 BTC/day
X13: 9 MH/s, 0.002 BTC/day
Scrypt: 3 MH/s, 0.003 BTC/day
Scrypt-N: 1.4 MH/s, 0.003 BTC/day
This is enough information for the pool to determine which algo is best for that specific rig. I don't think there are any exponential functions involved here. Just find a way for the miner to supply that information to the pool - two numbers for each algo - whether via stratum protocol enhancements, or via password field (hate that but whatever gets it going).
If you want to make it easier for the miner you can provide a calculator on the website where the user could enter power consumption in Watts and power cost per kWh and get the BTC per day value, and even provide a list of typical rig configs to choose from, downloadable config files etc. BTC/fiat exchange rate is not that significant, because relative cost for each algo will remain roughly the same if BTC goes up or down, only the miner's absolute profit will change.