Unnecessary mining [duplicate]

Question

Short Question:

Why is my node mining?

Long Question:

I just deployed Ethereum using the following information:

Genesis code

{
"config": {  
    "chainId": 7654321, 
    "homesteadBlock": 0,
    "eip155Block": 0,
    "eip158Block": 0
               },
"difficulty": "0x4000",
"gasLimit": "0x8000000",  
"alloc": {}
}
}

Set up code geth --datadir c:\blockchain init c:\genesis.json

Node startup

  geth –-identity "blockdb" –-rpc -–rpcport "8258" --rpccorsdomain "*" –-rpcapi "db,eth,net,web3" –-datadir "c:\\blockchain" –-port "30303" –-nodiscover –-networkid 7654321 console

When I create an account and do Miner.start(), it goes into a long mining cycle

This goes on and on. Why? The question arises because I was following this video, and his blockchain is not doing anything. Why so?

Is it possible to stop the blockchain from adding unnecessary Blocks? This should save CPU Power right?

Answer 1

Because that's how blockchains work: they store transactions into blocks and these blocks have to be mined.

Your node is basically generating blocks in your private blockchain. These are empty blocks (unless you issue transactions).

In conclusion, your node is doing what it's supposed to do and you can start playing with it.