mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Clara van Staden
2ab3f03f0b
Removes the `bridges/snowbridge/parachain` directory and moves everything up to under `snowbridge` directly. We are cleaning up our local dev env after merging our crates into the polkadot-sdk. --------- Co-authored-by: claravanstaden <Cats 4 life!>
89 lines
4.6 KiB
Markdown
89 lines
4.6 KiB
Markdown
# Motivation
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Demonstrate that
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[FastAggregateVerify](https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-bls-signature-04#section-3.3.4) is the most
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expensive call in ethereum beacon light client, though in [#13031](https://github.com/paritytech/substrate/pull/13031)
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Parity team has wrapped some low level host functions for `bls-12381` but adding a high level host function specific
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for it is super helpful.
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# Benchmark
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We add several benchmarks
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[here](https://github.com/Snowfork/snowbridge/blob/8891ca3cdcf2e04d8118c206588c956541ae4710/parachain/pallets/ethereum-client/src/benchmarking/mod.rs#L98-L124)
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as following to demonstrate
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[bls_fast_aggregate_verify](https://github.com/Snowfork/snowbridge/blob/8891ca3cdcf2e04d8118c206588c956541ae4710/parachain/pallets/ethereum-client/src/lib.rs#L764)
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is the main bottleneck. Test data
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[here](https://github.com/Snowfork/snowbridge/blob/8891ca3cdcf2e04d8118c206588c956541ae4710/parachain/pallets/ethereum-client/src/benchmarking/data_mainnet.rs#L553-L1120)
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is real from goerli network which contains 512 public keys from sync committee.
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## sync_committee_period_update
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Base line benchmark for extrinsic [sync_committee_period_update](https://github.com/Snowfork/snowbridge/blob/8891ca3cdcf2e04d8118c206588c956541ae4710/parachain/pallets/ethereum-client/src/lib.rs#L233)
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## bls_fast_aggregate_verify
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Subfunction of extrinsic `sync_committee_period_update` which does what
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[FastAggregateVerify](https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-bls-signature-04#section-3.3.4) requires.
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## bls_aggregate_pubkey
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Subfunction of `bls_fast_aggregate_verify` which decompress and instantiate G1 pubkeys only.
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## bls_verify_message
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Subfunction of `bls_fast_aggregate_verify` which verify the prepared signature only.
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# Result
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## hardware spec
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Run benchmark in a EC2 instance
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```
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cargo run --release --bin polkadot-parachain --features runtime-benchmarks -- benchmark machine --base-path /mnt/scratch/benchmark
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+----------+----------------+-------------+-------------+-------------------+
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| Category | Function | Score | Minimum | Result |
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+===========================================================================+
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| CPU | BLAKE2-256 | 1.08 GiBs | 1.00 GiBs | ✅ Pass (107.5 %) |
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|----------+----------------+-------------+-------------+-------------------|
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| CPU | SR25519-Verify | 568.87 KiBs | 666.00 KiBs | ❌ Fail ( 85.4 %) |
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|----------+----------------+-------------+-------------+-------------------|
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| Memory | Copy | 13.67 GiBs | 14.32 GiBs | ✅ Pass ( 95.4 %) |
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|----------+----------------+-------------+-------------+-------------------|
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| Disk | Seq Write | 334.35 MiBs | 450.00 MiBs | ❌ Fail ( 74.3 %) |
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|----------+----------------+-------------+-------------+-------------------|
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| Disk | Rnd Write | 143.59 MiBs | 200.00 MiBs | ❌ Fail ( 71.8 %) |
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+----------+----------------+-------------+-------------+-------------------+
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```
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## benchmark
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```
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cargo run --release --bin polkadot-parachain \
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--features runtime-benchmarks \
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-- \
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benchmark pallet \
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--base-path /mnt/scratch/benchmark \
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--chain=bridge-hub-rococo-dev \
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--pallet=snowbridge_pallet_ethereum_client \
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--extrinsic="*" \
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--execution=wasm --wasm-execution=compiled \
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--steps 50 --repeat 20 \
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--output ./parachains/runtimes/bridge-hubs/bridge-hub-rococo/src/weights/snowbridge_pallet_ethereum_client.rs
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```
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### [Weights](https://github.com/Snowfork/cumulus/blob/ron/benchmark-beacon-bridge/parachains/runtimes/bridge-hubs/bridge-hub-rococo/src/weights/snowbridge_pallet_ethereum_client.rs)
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|extrinsic | minimum execution time benchmarked(us) |
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| --------------------------------------- |----------------------------------------|
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|sync_committee_period_update | 123_126 |
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|bls_fast_aggregate_verify| 121_083 |
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|bls_aggregate_pubkey | 90_306 |
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|bls_verify_message | 28_000 |
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- [bls_fast_aggregate_verify](#bls_fast_aggregate_verify) consumes 98% execution time of [sync_committee_period_update](#sync_committee_period_update)
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- [bls_aggregate_pubkey](#bls_aggregate_pubkey) consumes 75% execution time of [bls_fast_aggregate_verify](#bls_fast_aggregate_verify)
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- [bls_verify_message](#bls_verify_message) consumes 23% execution time of [bls_fast_aggregate_verify](#bls_fast_aggregate_verify)
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# Conclusion
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A high level host function specific for
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[bls_fast_aggregate_verify](https://github.com/Snowfork/snowbridge/blob/8891ca3cdcf2e04d8118c206588c956541ae4710/parachain/pallets/ethereum-client/src/lib.rs#L764)
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is super helpful.
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