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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.

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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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