RareSkills Solidity Interview Question #21 Answered: As of the Shanghai upgrade, what is the gas limit per block?

This series will provide answers to the list of Solidity interview questions that were published by RareSkills..

Question #21 (Easy): As of the Shanghai upgrade, what is the gas limit per block?

Answer: As of the Shanghai upgrade, the gas limit per block is 30 million. This means that the total amount of gas spent on all transactions in a block must be less than 30 million. This is how the number of transactions per block is limited.

Demonstration:

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

contract GasLimitExample {
    uint256 public counter = 0;

    /**
     * This function's gas usage could hit the block limit of 30 million gas,
     * if it is called with a high enough "_count" and enough gas is provided
     * for execution.
     */
    function loopIncrement(uint256 _count) public {
        for (uint256 i = 0; i < _count; i++) {
            counter += 1;
        }
    }
}

Further Discussion:

Although the gas limit per block is 30 million, the gas target per block is 15 million.

Connect with me:

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Previous articles:

• Question 11 (Easy): Why shouldn’t tx.origin be used for authentication?
• Question #12 (Easy): What hash function does Ethereum primarily use?
• Question #13 (Easy): How much is 1 gwei of Ether?
• Question #14 (Easy): How much is 1 wei of Ether?
• Question #15 (Easy): What is the difference between assert and require?
• Question #16 (Easy): What is a flash loan?
• Question #17 (Easy): What is the check-effects pattern?
• Question #18 (Easy): What is the minimum amount of Ether required to run a solo staking node?
• Question #19 (Easy): What is the difference between fallback and receive?
• Question #20 (Easy): What is reentrancy?

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