SIP-20: Gas Optimisations
| Author | |
|---|---|
| Discussions-To | https://discord.gg/CDTvjHY |
| Status | Implemented |
| Created | 2019-10-15 |
Simple Summary
Optimize the gas on critical, high use functions that are used almost weekly by users that currently cost a lot in gas usage.
Abstract
To make transactions cost less gas usage for Synthetix users, a gitcoin bounty was created to R&D gas optimisations on the upgradable contracts across these high use functions;
- Synthetix.issueSynths (& issueMaxSynths)
- Synthetix.burnSynths
- Synthetix.exchange
- Synthetix.transfer (& transferFrom)
- FeePool.claimFees
- ExchangeRates.updateRates (onlyOracle function)
Excludes
- using solidity compilers optimize runs
- ownerOnly functions
The bounty resulted in several PRs for the team to validate and integrate into the system with some high value gas savings achieved.
Motivation
Public functions
For SNX holders/mintr users, reducing the cost of maintaining SNX collateralisation ratio via mint & burn, claiming fees and rewards and token transfers and Synthetix.exchange trades.
onlyOracle functions
Reduce the cost of the ExchangeRates.updateRates function in storing pricing data onching will save the foundation in ETH running costs for the oracle.
Specification
(@k06a) Gas Opt results
alpha (2eaef0dddf95d6c0e3a1acd4a96482aab8143d30):
·--------------------------------------------------------|---------------------------|-------------|----------------------------·
| Solc version: 0.4.25+commit.59dbf8f1 · Optimizer enabled: true · Runs: 200 · Block limit: 8000000 gas │
·························································|···························|·············|·····························
| Methods · 4 gwei/gas · 180.56 usd/eth │
························|································|·············|·············|·············|··············|··············
| Contract · Method · Min · Max · Avg · # calls · usd (avg) │
························|································|·············|·············|·············|··············|··············
| Synthetix · issueSynths · 306850 · 582310 · 423915 · 284 · 0.31 │
························|································|·············|·············|·············|··············|··············
| Synthetix · burnSynths · 476976 · 664025 · 561884 · 99 · 0.41 │
························|································|·············|·············|·············|··············|··············
| ExchangeRates · updateRates · 56015 · 6535679 · 117042 · 486 · 0.08 │
························|································|·············|·············|·············|··············|··············
| FeePool · claimFees · 390436 · 514240 · 441358 · 41 · 0.32 │
························|································|·············|·············|·············|··············|··············
| Synthetix · exchange · 59871 · 249564 · 224765 · 45 · 0.16 │
························|································|·············|·············|·············|··············|··············
optimize/rates-storage (1e2196d59bbd921bce144195e00d198548c64c28):
·--------------------------------------------------------|---------------------------|-------------|----------------------------·
| Solc version: 0.4.25+commit.59dbf8f1 · Optimizer enabled: true · Runs: 200 · Block limit: 8000000 gas │
·························································|···························|·············|·····························
| Methods · 4 gwei/gas · 180.56 usd/eth │
························|································|·············|·············|·············|··············|··············
| Contract · Method · Min · Max · Avg · # calls · usd (avg) │
························|································|·············|·············|·············|··············|··············
| Synthetix · issueSynths · 307688 · 584059 · 426344 · 284 · 0.31 │
························|································|·············|·············|·············|··············|··············
| Synthetix · burnSynths · 479100 · 666231 · 564608 · 99 · 0.41 │
························|································|·············|·············|·············|··············|··············
| ExchangeRates · updateRates · 46830 · 3566459 · 84580 · 486 · 0.06 │
························|································|·············|·············|·············|··············|··············
| FeePool · claimFees · 391534 · 515471 · 442495 · 41 · 0.32 │
························|································|·············|·············|·············|··············|··············
| Synthetix · exchange · 59871 · 249871 · 225068 · 45 · 0.16 │
························|································|·············|·············|·············|··············|··············
Test Cases
Implementation
https://github.com/Synthetixio/synthetix/commit/05c42daefb282a49f791e7e626e10cf1f8352f36
Copyright
Copyright and related rights waived via CC0.