How come my testnet chaindata folder is so big? I'm running Ethereum Wallet 0.8.7. Deploying little test smart contracts. Actual chaindata size is 9.4 GBs.


Chances are you're looking at the public testnet, Morden. It's a full blockchain, so gigabytes of data isn't surprising--it's not just you, it's everyone else's little smart contracts!

If you need a private testnet, you'll have to manually set one up--but it is relatively simple to do so. Browser Solidity will create one for you in your browser. testrpc also creates one instantly, but I don't know how well it meshes with Ethereum Wallet. If all else fails, you can set up a real, honest-to-goodness private blockchain on geth with the instructions here, then Ethereum Wallet will definitely connect.

  • Yes, I've used testrpc, but want to use it with my wallet, so I will check out setting up my own testnet. Thanks! Am I understanding your explanation correctly in extrapolating that the Morden Testnet has more contracts written to it than the public chain? – mleafer Nov 17 '16 at 14:19
  • I doubt it. While everyone who uses Morden contributes to its size, there's even more users of the mainnet. My (mainnet) chaindata is 16 gigabytes, for example. – Matthew Schmidt Nov 17 '16 at 16:16
  • My Morden testnet chaindata (/Libary/Ethereum/testnet/chaindata) is 32GB on Nov 23 2016. Is something going wrong? – emunsing Nov 23 '16 at 18:01
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    I don't know, but Morden itself recently broke (accidental geth/parity consensus failure). Instructions for using Ropsten (the new testnet) can be found here. – Matthew Schmidt Nov 23 '16 at 19:48

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