feat: add benchmarks

.github/workflows/master.yaml

@@ -0,0 +1,46 @@
+name: Master
+on:
+  push:
+    branches:
+      - master
+
+permissions:
+  contents: read
+
+jobs:
+  bench:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-go@v4
+        with:
+          go-version-file: './go.mod'
+
+      - name: Run benchmark and store the output to a file
+        run: |
+          set -o pipefail
+          make bench | tee bench_output.txt
+
+      - name: Get benchmark as JSON
+        uses: benchmark-action/github-action-benchmark@v1
+        with:
+          # What benchmark tool the output.txt came from
+          tool: 'go'
+          # Where the output from the benchmark tool is stored
+          output-file-path: bench_output.txt
+          # Write benchmarks to this file
+          external-data-json-path: ./cache/benchmark-data.json
+          # Workflow will fail when an alert happens
+          fail-on-alert: true
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          comment-on-alert: true
+
+      - name: Save benchmark JSON to cache
+        uses: actions/cache/save@v3
+        with:
+          path: ./cache/benchmark-data.json
+          # Save with commit hash to avoid "cache already exists"
+          # Save with OS to prevent comparing against results from different CPUs
+          key: ${{ github.sha }}-${{ runner.os }}-go-benchmark

.github/workflows/pull_request.yaml

@@ -18,7 +18,6 @@ jobs:
         uses: actions/setup-go@v4
         with:
           go-version-file: './go.mod'
-          check-latest: true
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v3
         with:
@@ -34,6 +33,75 @@ jobs:
         uses: actions/setup-go@v4
         with:
           go-version-file: './go.mod'
-          check-latest: true
       - name: Unit Tests
-        run: make t
+        run: make t
+  bench:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0 # to be able to retrieve the last commit in master branch
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version-file: './go.mod'
+          cache-dependency-path: './go.sum'
+          check-latest: true
+
+      - name: Run benchmark and store the output to a file
+        run: |
+          set -o pipefail
+          make bench | tee ${{ github.sha }}_bench_output.txt
+
+      - name: Get Master branch SHA
+        id: get-master-branch-sha
+        run: |
+          SHA=$(git rev-parse origin/master)
+          echo "sha=$SHA" >> $GITHUB_OUTPUT
+
+      - name: Try to get benchmark JSON from master branch
+        uses: actions/cache/restore@v3
+        id: cache
+        with:
+          path: ./cache/benchmark-data.json
+          key: ${{ steps.get-master-branch-sha.outputs.sha }}-${{ runner.os }}-go-benchmark
+
+      - name: Compare benchmarks with master
+        uses: benchmark-action/github-action-benchmark@v1
+        if: steps.cache.outputs.cache-hit == 'true'
+        with:
+          # What benchmark tool the output.txt came from
+          tool: 'go'
+          # Where the output from the benchmark tool is stored
+          output-file-path: ${{ github.sha }}_bench_output.txt
+          # Where the benchmarks in master are (to compare)
+          external-data-json-path: ./cache/benchmark-data.json
+          # Do not save the data
+          save-data-file: false
+          # Workflow will fail when an alert happens
+          fail-on-alert: true
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          # Enable Job Summary for PRs
+          summary-always: true
+
+      - name: Run benchmarks
+        uses: benchmark-action/github-action-benchmark@v1
+        if: steps.cache.outputs.cache-hit != 'true'
+        with:
+          # What benchmark tool the output.txt came from
+          tool: 'go'
+          # Where the output from the benchmark tool is stored
+          output-file-path: ${{ github.sha }}_bench_output.txt
+          # Write benchmarks to this file, do not publish to Github Pages
+          save-data-file: false
+          external-data-json-path: ./cache/benchmark-data.json
+          # Workflow will fail when an alert happens
+          fail-on-alert: true
+          # Enable alert commit comment
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          comment-on-alert: true
+          # Enable Job Summary for PRs
+          summary-always: true

.gitignore

@@ -1 +1,3 @@
 vendor/
+.idea/
+*.out

Makefile

@@ -1,3 +1,13 @@
+.DEFAULT_GOAL := help
+
+.PHONY: help
+help:
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
+
+.PHONY: bench
+bench: ## Run benchmarks
+	go test ./... -bench . -benchtime 5s -timeout 0 -run=XXX -benchmem
+
 .PHONY: l
 l: ## Lint Go source files
 	go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest && golangci-lint run
@@ -12,9 +22,4 @@ f: ## Format code
 
 .PHONY: c
 c: ## Measure code coverage
-	go test -race -covermode=atomic ./... -coverprofile=cover.out && \
-	go tool cover -func cover.out \
-		| grep -v '100.0%' \
-		|| true
-
-	rm cover.out
+	go test -race -covermode=atomic ./... -coverprofile=cover.out

cache_test.go

@@ -441,6 +441,63 @@ func Test_ConcurrentClearAndSet(t *testing.T) {
 	}
 }
 
+func BenchmarkFrequentSets(b *testing.B) {
+	cache := New(Configure[int]())
+	defer cache.Stop()
+
+	b.ResetTimer()
+	for n := 0; n < b.N; n++ {
+		key := strconv.Itoa(n)
+		cache.Set(key, n, time.Minute)
+	}
+}
+
+func BenchmarkFrequentGets(b *testing.B) {
+	cache := New(Configure[int]())
+	defer cache.Stop()
+	numKeys := 500
+	for i := 0; i < numKeys; i++ {
+		key := strconv.Itoa(i)
+		cache.Set(key, i, time.Minute)
+	}
+
+	b.ResetTimer()
+	for n := 0; n < b.N; n++ {
+		key := strconv.FormatInt(rand.Int63n(int64(numKeys)), 10)
+		cache.Get(key)
+	}
+}
+
+func BenchmarkGetWithPromoteSmall(b *testing.B) {
+	getsPerPromotes := 5
+	cache := New(Configure[int]().GetsPerPromote(int32(getsPerPromotes)))
+	defer cache.Stop()
+
+	b.ResetTimer()
+	for n := 0; n < b.N; n++ {
+		key := strconv.Itoa(n)
+		cache.Set(key, n, time.Minute)
+		for i := 0; i < getsPerPromotes; i++ {
+			cache.Get(key)
+		}
+	}
+}
+
+func BenchmarkGetWithPromoteLarge(b *testing.B) {
+	getsPerPromotes := 100
+	cache := New(Configure[int]().GetsPerPromote(int32(getsPerPromotes)))
+	defer cache.Stop()
+
+	b.ResetTimer()
+	for n := 0; n < b.N; n++ {
+		key := strconv.Itoa(n)
+		cache.Set(key, n, time.Minute)
+		for i := 0; i < getsPerPromotes; i++ {
+			cache.Get(key)
+		}
+	}
+}
+
 type SizedItem struct {
 	id int
 	s  int64

go.mod

@@ -1,3 +1,3 @@
 module github.com/karlseguin/ccache/v3
 
-go 1.18
+go 1.19