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tags: 1559
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# 1559 Large State Testing (preliminary)

As part of the testing process of 1559, we wanted to determine whether having "200% full" blocks on a network with a state size comparable to mainnet would cause any issues.

To test this, we've created a [tool which can generate a new network with an arbitrary number of accounts and contract storage slots](https://github.com/ConsenSys/tommygun-eth) and [a tool to then spam ethereum network with a large number of transactions](https://github.com/ConsenSys/eip1559-tx-sender). We set up a testnet with 100 million accounts and 100 million storage slots and synced 4 Besu + 4 Geth nodes on it, along with a Besu mining node.

As a first dry-run, we spammed the network for 1h45 with transactions, using 1 second blocks, and between 20-80 million gas per block. The nodes did not crash 🎉

The blocks themselves can be seen on the network's block explorer: [first block of test](http://3.21.227.120:3000/block/92948), [last block of test](http://3.21.227.120:3000/block/99264). The raw data is available [here](https://docs.google.com/spreadsheets/d/1aK3Qj0Ds-iFmfzeWQVGN78XbxLZ9B2Xrf3QwJ1nF7Ag/edit#gid=0).

For the next test, we plan to have metrics turned on the nodes, and also include the Nethermind implementation. It is scheduled for next week.

**Question for AllCoreDevs: what metrics would you like to see gathered on the nodes for the next test?**