ink! contract extrinsics only take 10-11% block weights when stress test

Question

I have an ink! contract project and I'm doing stress test to benchmark the performance of this ink! contract project in a production chain.

My stress test includes these steps:

1. Deploy ink! projects
2. Execute the contract from multiple accounts and manually tracking the account nonce to obtain parallel execution for each account.
3. Observe result

I ran stress test on 2 chains: Substrate node (2s block weight, 3s slot duration) and My standalone node (1s block weight, 3s slot duration). Both chains use maximum block length of 5 Mib.

Observation:

1. For each block, extrinsics only takes 10-11% block weight.
2. There are still many pending extrinsics in the transaction pool and are gradually included in later blocks.
3. Block length reaches only 2.5 KiB for these cases, implying the cause is not from the block length.

I don't know if in general, this is also the problem for other pallets or is it just because of pallet-contracts or something related to pallet-contracts.

Answer 1

The comment by Andrew above links this tool which we use for benchmarking ink! contracts: https://github.com/paritytech/smart-bench.

The readme contains some info on how to use it, in case of uncertainties/missing docs feel free to open an issue.