190 lines
7.7 KiB
Markdown
190 lines
7.7 KiB
Markdown
---
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title: Mining
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sort_key: B
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---
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This document explains how to set up geth for mining. The Ethereum wiki also has a [page
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about mining](https://eth.wiki/en/fundamentals/mining), be sure to check that one as well.
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Mining is the process through which new blocks are created. Geth actually creates new
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blocks all the time, but these blocks need to be secured through proof-of-work so they
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will be accepted by other nodes. Mining is all about creating these proof-of-work values.
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The proof-of-work computation can be performed in multiple ways. Geth includes a CPU
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miner, which does mining within the geth process. We discourage using the CPU miner with
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the Ethereum mainnet. If you want to mine real ether, use GPU mining. Your best option for
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doing that is the [ethminer](https://github.com/ethereum-mining/ethminer) software.
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Always ensure your blockchain is fully synchronised with the chain before starting to
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mine, otherwise you will not be mining on the correct chain and your block rewards will
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not be valueable.
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## GPU mining
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The ethash algorithm is memory hard and in order to fit the DAG into memory, it needs
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1-2GB of RAM on each GPU. If you get `Error GPU mining. GPU memory fragmentation?` you
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don't have enough memory.
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### Installing ethminer
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To get ethminer, you need to install the ethminer binary package or build it from source.
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See <https://github.com/ethereum-mining/ethminer/#build> for the official ethminer
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build/install instructions. At the time of writing, ethminer only provides a binary for
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Microsoft Windows.
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### Using ethminer with geth
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First create an account to hold your block rewards.
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geth account new
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Follow the prompts and enter a good password. **DO NOT FORGET YOUR PASSWORD**. Also take
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note of the public Ethereum address which is printed at the end of the account creation
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process. In the following examples, we will use 0xC95767AC46EA2A9162F0734651d6cF17e5BfcF10
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as the example address.
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Now start geth and wait for it to sync the blockchain. This will take quite a while.
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geth --http --miner.etherbase 0xC95767AC46EA2A9162F0734651d6cF17e5BfcF10
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To monitor the syncing, in another terminal you can `attach` the geth JavaScript console to the running node like so:
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geth attach https://127.0.0.1:8545
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and then at the > prompt type
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eth.syncing
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You'll see something like the example output below -- it's a two stage process as described in much more detail in our [FAQ](../FAQ).
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In the first stage, the difference between the "currentBlock" and the "highestBlock" will decrease until they are almost equal. It will then look stuck and appear as never becoming equal. But you should see "pulledStates" rising to equal "knownStates." When both are equal, you are synced.
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Example output of first stage of block downloading:
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{
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currentBlock: 10707814,
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highestBlock: 13252182,
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knownStates: 0,
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pulledStates: 0,
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startingBlock: 3809258
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}
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A response from `eth.syncing` of `false` means you are synced up.
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Now we're ready to start mining. In a new terminal session, run ethminer and connect it to geth:
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OpenCL
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ethminer -G -P http://127.0.0.1:8545
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CUDA
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ethminer -U -P http://127.0.0.1:8545
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`ethminer` communicates with geth on port 8545 (the default RPC port in geth). You can
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change this by giving the [`--http.port` option](../rpc/server) to `geth`. Ethminer will find
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geth on any port. You also need to set the port on `ethminer` with `-P
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http://127.0.0.1:3301`. Setting up custom ports is necessary if you want several instances
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mining on the same computer. If you are testing on a private cluster, we recommend you use
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CPU mining instead.
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If the default for `ethminer` does not work try to specify the OpenCL device with:
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`--opencl-device X` where X is 0, 1, 2, etc. When running `ethminer` with `-M`
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(benchmark), you should see something like:
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Benchmarking on platform: { "platform": "NVIDIA CUDA", "device": "GeForce GTX 750 Ti", "version": "OpenCL 1.1 CUDA" }
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Benchmarking on platform: { "platform": "Apple", "device": "Intel(R) Xeon(R) CPU E5-1620 v2 @ 3.70GHz", "version": "OpenCL 1.2 " }
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**Note** hashrate info is not available in `geth` when GPU mining. Check your hashrate
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with `ethminer`, `miner.hashrate` will always report 0.
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## CPU Mining with Geth
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When you start up your ethereum node with `geth` it is not mining by default. To start it
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in mining mode, you use the `--mine` command-line flag. The `--miner.threads` parameter can
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be used to set the number parallel mining threads (defaulting to the total number of
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processor cores).
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geth --mine --miner.threads=4
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You can also start and stop CPU mining at runtime using the
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[console](../interface/javascript-console). `miner.start` takes an optional parameter for
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the number of miner threads.
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> miner.start(8)
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true
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> miner.stop()
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true
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Note that mining for real ether only makes sense if you are in sync with the network
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(since you mine on top of the consensus block). Therefore the eth blockchain
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downloader/synchroniser will delay mining until syncing is complete, and after that mining
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automatically starts unless you cancel your intention with `miner.stop()`.
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In order to earn ether you must have your **etherbase** (or **coinbase**) address set.
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This etherbase defaults to your [primary account](../interface/managing-your-accounts). If
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you don't have an etherbase address, then `geth --mine` will not start up.
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You can set your etherbase on the command line:
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geth --miner.etherbase '0xC95767AC46EA2A9162F0734651d6cF17e5BfcF10' --mine 2>> geth.log
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You can reset your etherbase on the console too:
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> miner.setEtherbase(eth.accounts[2])
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Note that your etherbase does not need to be an address of a local account, just an
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existing one.
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There is an option [to add extra data](../interface/javascript-console) (32 bytes only) to
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your mined blocks. By convention this is interpreted as a unicode string, so you can set
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your short vanity tag.
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> miner.setExtra("ΞTHΞЯSPHΞЯΞ")
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You can check your hashrate with [miner.hashrate](../interface/javascript-console), the
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result is in H/s (Hash operations per second).
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> eth.hashrate
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712000
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After you successfully mined some blocks, you can check the ether balance of your
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etherbase account. Now assuming your etherbase is a local account:
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> eth.getBalance(eth.coinbase).toNumber();
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'34698870000000'
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You can check which blocks are mined by a particular miner (address) with the following
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code snippet on the console:
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> function minedBlocks(lastn, addr) {
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addrs = [];
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if (!addr) {
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addr = eth.coinbase
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}
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limit = eth.blockNumber - lastn
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for (i = eth.blockNumber; i >= limit; i--) {
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if (eth.getBlock(i).miner == addr) {
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addrs.push(i)
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}
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}
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return addrs
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}
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// scans the last 1000 blocks and returns the blocknumbers of blocks mined by your coinbase
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// (more precisely blocks the mining reward for which is sent to your coinbase).
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> minedBlocks(1000, eth.coinbase)
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[352708, 352655, 352559]
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Note that it will happen often that you find a block yet it never makes it to the
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canonical chain. This means when you locally include your mined block, the current state
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will show the mining reward credited to your account, however, after a while, the better
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chain is discovered and we switch to a chain in which your block is not included and
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therefore no mining reward is credited. Therefore it is quite possible that as a miner
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monitoring their coinbase balance will find that it may fluctuate quite a bit.
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The logs show locally mined blocks confirmed after 5 blocks. At the moment you may find it
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easier and faster to generate the list of your mined blocks from these logs.
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[eth-wiki-mining]: https://github.com/ethereum/wiki/wiki/Mining
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[ethminer]: https://github.com/ethereum-mining/ethminer
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