Use this documentation on benchmarking. It is very good and will give all info you need.

To start existing benchmark tests I propose following steps:

• rename pallets/rmrk-core/src/weights.rs to old_weights.rs. Just to keep it for referrence
• examine the tests in benchmarks.rs files. They will produce measurements for the new weights.rs file
• compile node with --features runtime-benchmarks
• since rmrk node is missing production profile, use --profile=release in cargo build. Therefore instead of:

cd bin/node/cli
cargo build --profile=production --features runtime-benchmarks

use this:

cd bin/node/cli
cargo build --profile=release --features runtime-benchmarks

• after building, run the node with:

./target/release/rmrk-substrate benchmark pallet \
    --chain dev \
    --execution=wasm \
    --wasm-execution=compiled \
    --pallet pallet_rmrk_core \
    --extrinsic "*" \
    --steps 50 \
    --repeat 20 \
    --output pallets/rmrk-core/src/weight.rs

• this will generate new pallets/rmrk-core/src/weight.rs

• compare old_weights.rs and newly genetated weights.rs. You will see missing trait and some renaming. This could be fixed with template file like this
  • I never found time to explore that and I mannualy changed that trait
• check also runtime/src/lib file. in the pallet_rmrk_core there is now WeightInfo which points to this newly generated weights.rs file

type WeightInfo = pallet_rmrk_core::weights::SubstrateWeight<Runtime>;

• you can also run all benchmark tests before building node:

cargo test --package pallet-rmrk-core --features runtime-benchmarks