Whitepaper - Ethereum Classic With Cover

Ethereum Classic Documentation, Release 0.1
Using ethminer with geth
geth account new // Set-up ethereum account if you do not have one
geth --rpc --rpccorsdomain localhost 2>> geth.log &
ethminer -G // -G for GPU, -M for benchmark
tail -f geth.log
ethminer communicates with geth on port 8545 (the default RPC port in geth). You can change this by
giving the --rpcport option to geth. Ethminer will find geth on any port. Note that you need to set
the CORS header with --rpccorsdomain localhost. You can also set port on ethminer with -F
http://127.0.0.1:3301. Setting the ports is necessary if you want several instances mining on the same
computer, although this is somewhat pointless. If you are testing on a private chain, we recommend you use CPU
mining instead.
Note: You do not need to give geth the --mine option or start the miner in the console unless you want to do
CPU mining on TOP of GPU mining.
If the default for ethminer does not work try to specify the OpenCL device with: --opencl-device X
where X is {0, 1, 2,...}. When running ethminer with -M (benchmark), you should see something like:
Benchmarking on platform: { "platform": "NVIDIA CUDA", "device": "GeForce GTX 750 Ti", "version":
Benchmarking on platform: { "platform": "Apple", "device": "Intel(R) Xeon(R) CPU E5-1620 v2 @ 3.70
To debug geth:
geth
--rpccorsdomain "localhost" --verbosity 6 2>> geth.log
To debug the miner:
make -DCMAKE_BUILD_TYPE=Debug -DETHASHCL=1 -DGUI=0
gdb --args ethminer -G -M
Note: hashrate info is not available in geth when GPU mining.
Check your hashrate with ethminer, miner.hashrate will always report 0.
Using ethminer with eth
Mining on a single GPU
In order to mine on a single GPU all that needs to be done is to run eth with the following arguments:
eth -v 1 -a 0xcadb3223d4eebcaa7b40ec5722967ced01cfc8f2 --client-name "OPTIONALNAMEHERE" -x 50 -m o
• -v 1 Set verbosity to 1. Let’s not get spammed by messages.
• -a YOURWALLETADDRESS Set the coinbase, where the mining rewards will go to. The above address is
just an example. This argument is really important, make sure to not make a mistake in your wallet address
or you will receive no ether payout.
• --client-name "OPTIONAL" Set an optional client name to identify you on the network
• -x 50 Request a high amount of peers. Helps with finding peers in the beginning.
• -m on Actually launch with mining on.
• -G set GPU mining on.
70 Chapter 1. Contents