Support bencher and codspeed

Signed-off-by: Moritz Hoffmann <[email protected]>

.github/workflows/codspeed.yml

@@ -0,0 +1,28 @@
+name: codspeed-benchmarks
+
+on:
+  # Run on pushes to the main branch
+  push:
+    branches:
+      - "main"
+  # Run on pull requests
+  pull_request:
+  # `workflow_dispatch` allows CodSpeed to trigger backtest
+  # performance analysis in order to generate initial data.
+  workflow_dispatch:
+
+jobs:
+  benchmarks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+
+      - name: Build the benchmark target(s)
+        run: cargo codspeed build
+
+      - name: Run the benchmarks
+        uses: CodSpeedHQ/action@v2
+        with:
+          run: cargo codspeed run
+          token: ${{ secrets.CODSPEED_TOKEN }}

Cargo.toml

@@ -20,3 +20,11 @@ default = ["serde"]
 debug = 2
 codegen-units = 1
 lto = true
+
+[dev-dependencies]
+bencher = "0.1.5"
+codspeed-bencher-compat = "2.6.0"
+
+[[bench]]
+name = "bench"
+harness = false