Noob question: how do I submit a Base txn with >100M gas? Wanna test something.

Write a contract with al giant for loop that deploys contracts or write to storage. Writing to storage is probably a little healthier for the chain

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I noticed that if I use 30M gas doing ecrecover in foundry, the time needed to process it is about 0.8s on a relatively fast CPU.

Thus, I wonder what will happen if I could submit a txn that burns 100M gas with ecrecover on Base, which has a block time of 2 seconds.

There are probably worst opcodes and operations out there to DDOS a chain, Geth team has some good benchmarks on mispriced opcodes IIRC. If you havent yet, you should read on Shanghai's attacks, which was basically what you are trying to do but on Ethereum mainnet ;

There are probably worst opcodes and operations out there to DDOS a chain, Geth team has some good benchmarks on mispriced opcodes IIRC. If you havent yet, you should read on Shanghai's attacks, which was basically what you are trying to do but on Ethereum mainnet ; https://ethos.dev/shanghai-attacks

You should try and do it, but note that it will cost you a decent amount to sustain this DDOS over multiple seconds / minutes. But even 5-10 blocks should be enough to see whether it had an impact or not on block production speed