Gas Tracking

🚨 Important

Gas tracking may not be entirely accurate in the ZKsync context. This is mostly due to the additional overhead to executing each CREATE or CALL in its own zkEVM which has additional bootloader gas costs.

Forge can help you estimate how much gas your contract will consume.

Currently, Forge ships with two different tools for this job, but they may be merged in the future:

  • Gas reports: Gas reports give you an overview of how much Forge thinks the individual functions in your contracts will consume in gas.
  • Gas snapshots: Gas snapshots give you an overview of how much each test consumes in gas.

Gas reports and gas snapshots differ in some ways:

  • Gas reports use tracing to figure out gas costs for individual contract calls.
    This gives more granular insight, at the cost of speed.
  • Gas snapshots have more built-in tools, such as diffs and exporting the results to a file.
    Snapshots are not as granular as gas reports, but they are faster to generate.