About

Execute contracts/calculations as Near contract and interpret it inside another Near contract by running the following command. Gas usage will be printed to standard output and the calculations are repeated loop-limit times.

Usage

cargo run -- --help

Results

$ cargo run -- --loop-limit 1,100,1000,10000,20000

+-------------------+----------------+------------------+-------------------+--------------------+--------------------+
| exec_mode         | loop_limit = 1 | loop_limit = 100 | loop_limit = 1000 | loop_limit = 10000 | loop_limit = 20000 |
+=====================================================================================================================+
| native            | 2.6680 TGas    | 2.6729 TGas      | 2.7117 TGas       | 3.0971 TGas        | 3.5250 TGas        |
|-------------------+----------------+------------------+-------------------+--------------------+--------------------|
| wasmi interpreter | 73.6618 TGas   | 74.7821 TGas     | 84.8506 TGas      | 185.4982 TGas      | 297.3189 TGas      |
+-------------------+----------------+------------------+-------------------+--------------------+--------------------+

Observations:

• Interpreter setup for wasmi roughly costs 70 TGas (compare gas usage for loop_limit = 1).
  • This can be a deal breaker if an Ethereum XCC is to be executed in a separate interpreter instance.
• Increasing the loop_limit from 1 to 20_000 only slightly increases native gas usage. For wasmi interpreter, however, it drives gas usage up to the limit per transaction of 300 TGas.

Log noise

The following noise in logs is due to this issue:

Updated the logging layer according to `log_config.json`