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Gas measurements comparison

Comparing the way Forge, Tevm, Hardhat and forge-gas-metering will report gas usage against Sepolia testnet transactions.

There are two subsequent mint transactions on a newly deployed mock ERC20 contract, for each of the two scenarios. There are 50 0 bytes from the transaction's data in the first scenario that are turned into 1 bytes in the second one, which explains the expected 600 gas overhead (600 = 50 * (16 - 4)).

The idea is to figure out which of these tools will report different gas usage based on the amount of zero and non-zero bytes that need to be read/written.

Results

The process is the following:

  1. deploy the contract;
  2. mint the same amount of tokens to the same address twice.

recipient = 0x0000000000000000000000000000000000000001 | 0x1111111111111111111111111111111111111111

amount = 0x0000000000000000000000000000000000000000000000000000000000000001 | 0x1111111111111111111111111111111111111111111111111111111111111111

Medium Zero bytes (1st) Non-zero bytes (1st) Zero bytes (2nd) Non-zero bytes (2nd) Bytes cost diff included Exact match
Reference (Sepolia tx) 67,839 68,439 33,639 34,239 ✅ ✅
Forge (isolated) 67,839 68,439 33,639 34,239 ✅ ✅
Hardhat 67,839 68,439 33,639 34,239 ✅ ✅
forge-gas-metering 63,879 64,479 21,579 22,179 ✅ ❌
Forge 46,495 46,495 2,695 2,695 ❌ ❌
Tevm 46,495 46,495 2,695 2,695 ❌ ❌

How to reproduce

Clone and install

git clone [email protected]:0xpolarzero/gas-metering-comparison.git
cd gas-metering-comparison

# From the root:
# Foundry
cd foundry
forge install

# Hardhat
cd hardhat
pnpm install

# Tevm
cd tevm
pnpm install

Sepolia

This will deploy the contract and mint the tokens twice. Which will provide both the reference Sepolia txs and the measurements from the script.

In /foundry:

  1. Create .env and fill it with the content in .env.example;

  2. run source .env;

  3. deploy the contract and mint the tokens:

  forge script script/DeployAndCall.s.sol:DeployAndCall --rpc-url $RPC_URL_SEPOLIA --broadcast -vvvv --sig "run(address, uint256)" 0x0000000000000000000000000000000000000001 0x0000000000000000000000000000000000000000000000000000000000000001
  # or
  forge script script/DeployAndCall.s.sol:DeployAndCall --rpc-url $RPC_URL_SEPOLIA --broadcast -vvvv --sig "run(address, uint256)" 0x1111111111111111111111111111111111111111 0x1111111111111111111111111111111111111111111111111111111111111111

Foundry (Forge)

In /foundry: run forge test --mc MockERC20Foundry -vvvv --isolate.

Hardhat

In /hardhat: run pnpm hardhat test.

forge-gas-metering

In /foundry: run forge test --mc MockERC20ForgeGasMetering -vv.

Tevm

In /tevm: run pnpm ts-node index.ts.