Update the benchmarks to only record/display select benchmarks. (#4560)

* Add a benchmark target to makefile

* update CI to reflect how the benchmarks will be used

* Add auto-push to benchmarks branch.

---------

Co-authored-by: Robert Pająk <pellared@hotmail.com>

.github/workflows/benchmark.yml

@@ -1,21 +1,24 @@
 name: Benchmark
 on:
   push:
-    branches:
-      - main
+    tags:
+      - v1.* 
+  workflow_dispatch: 
+
 env:
   DEFAULT_GO_VERSION: "~1.21.3"
 jobs:
   benchmark:
     name: Benchmarks
     runs-on: ubuntu-latest
+    timeout-minutes: 15
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v4
         with:
           go-version: ${{ env.DEFAULT_GO_VERSION }}
       - name: Run benchmarks
-        run: make test-bench | tee output.txt
+        run: make benchmark | tee output.txt
       - name: Download previous benchmark data
         uses: actions/cache@v3
         with:
@@ -28,6 +31,8 @@ jobs:
           tool: 'go'
           output-file-path: output.txt
           external-data-json-path: ./benchmarks/data.json
-          auto-push: false
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          gh-pages-branch: benchmarks
+          auto-push: true
           fail-on-alert: false
           alert-threshold: "400%"

.github/workflows/ci.yml

@@ -45,6 +45,22 @@ jobs:
         run: make build
       - name: Check clean repository
         run: make check-clean-work-tree
+  test-bench:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v4
+      - name: Setup Environment
+        run: |
+          echo "GOPATH=$(go env GOPATH)" >> $GITHUB_ENV
+          echo "$(go env GOPATH)/bin" >> $GITHUB_PATH
+      - name: Install Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.DEFAULT_GO_VERSION }}
+          cache-dependency-path: "**/go.sum"
+      - name: Run benchmarks to check functionality
+        run: make test-bench
 
   test-race:
     runs-on: ubuntu-latest

Makefile

@@ -192,6 +192,18 @@ test-coverage: | $(GOCOVMERGE)
 	done; \
 	$(GOCOVMERGE) $$(find . -name coverage.out) > coverage.txt
 
+# Adding a directory will include all benchmarks in that direcotry if a filter is not specified.
+BENCHMARK_TARGETS := sdk/trace
+.PHONY: benchmark
+benchmark: $(BENCHMARK_TARGETS:%=benchmark/%)
+BENCHMARK_FILTER = .
+# You can override the filter for a particular directory by adding a rule here.
+benchmark/sdk/trace: BENCHMARK_FILTER = SpanWithAttributes_8/AlwaysSample
+benchmark/%:
+	@echo "$(GO) test -timeout $(TIMEOUT)s -run=xxxxxMatchNothingxxxxx -bench=$(BENCHMARK_FILTER) $*..." \
+		&& cd $* \
+		$(foreach filter, $(BENCHMARK_FILTER), && $(GO) test -timeout $(TIMEOUT)s -run=xxxxxMatchNothingxxxxx -bench=$(filter))
+
 .PHONY: golangci-lint golangci-lint-fix
 golangci-lint-fix: ARGS=--fix
 golangci-lint-fix: golangci-lint

sdk/metric/internal/aggregate/exponential_histogram_test.go

@@ -676,7 +676,7 @@ func BenchmarkPrepend(b *testing.B) {
 
 func BenchmarkAppend(b *testing.B) {
 	for i := 0; i < b.N; i++ {
-		agg := newExpoHistogramDataPoint[float64](1024, 200, false, false)
+		agg := newExpoHistogramDataPoint[float64](1024, 20, false, false)
 		n := smallestNonZeroNormalFloat64
 		for j := 0; j < 1024; j++ {
 			agg.record(n)