Add Benchmarks for metrics

.github/workflows/pull_request.yml

@@ -19,6 +19,13 @@ jobs:
       linux_nightly_6_0_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
       linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
 
+  benchmarks:
+    name: Benchmarks
+    # Workaround https://github.com/nektos/act/issues/1875
+    uses: apple/swift-nio/.github/workflows/benchmarks.yml@main
+    with:
+      benchmark_package_path: "Benchmarks"
+
   cxx-interop:
     name: Cxx interop
     uses: apple/swift-nio/.github/workflows/cxx_interop.yml@main

Benchmarks/Benchmarks/PrometheusBenchmarks/Benchmarks.swift

@@ -13,6 +13,7 @@
 //===----------------------------------------------------------------------===//
 
 import Benchmark
+import Foundation
 import Prometheus
 
 let registry = PrometheusCollectorRegistry()
@@ -27,9 +28,17 @@ public func makeLabels(_ idx: Int) -> [(String, String)] {
 }
 
 let benchmarks = {
-    Benchmark.defaultConfiguration.maxDuration = .seconds(5)
-    Benchmark.defaultConfiguration.scalingFactor = .kilo
-    Benchmark.defaultConfiguration.metrics = [.mallocCountTotal]
+    let ciMetrics: [BenchmarkMetric] = [
+        .mallocCountTotal,
+    ]
+    let localMetrics = BenchmarkMetric.default
+
+    Benchmark.defaultConfiguration = .init(
+        metrics: ProcessInfo.processInfo.environment["CI"] != nil ? ciMetrics : localMetrics,
+        warmupIterations: 10,
+        scalingFactor: .kilo,
+        maxDuration: .seconds(5),
+    )
 
     Benchmark("Counter - setup and increment") { benchmark in
         runCounterBench(benchmark.scaledIterations)
@@ -52,7 +61,8 @@ let benchmarks = {
     }
 
     Benchmark("RegistryEmit - 5000 metrics",
-              configuration: .init(scalingFactor: .one)) { benchmark, run in
+              configuration: .init(scalingFactor: .one))
+    { benchmark, run in
         for _ in benchmark.scaledIterations {
             run()
         }

Benchmarks/Benchmarks/PrometheusBenchmarks/RegistryEmit.swift

@@ -27,7 +27,7 @@ public func setupRegistryExport(numberOfMetrics: Int) -> () -> Void {
     gaugeArray.reserveCapacity(numberOfMetrics)
     buffer.reserveCapacity(counterExportSize)
 
-    for i in 0..<(numberOfMetrics / 2) {
+    for i in 0 ..< (numberOfMetrics / 2) {
         let counter = registryExport.makeCounter(name: "http_requests_total", labels: makeLabels(i))
         counter.increment()
         counterArray.append(counter)

Benchmarks/Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.7
+// swift-tools-version:5.9
 //===----------------------------------------------------------------------===//
 //
 // This source file is part of the SwiftPrometheus open source project
@@ -22,7 +22,7 @@ let package = Package(
     ],
     dependencies: [
         .package(path: "../"),
-        .package(url: "https://github.com/ordo-one/package-benchmark.git", from: "1.11.2"),
+        .package(url: "https://github.com/ordo-one/package-benchmark.git", from: "1.29.0"),
     ],
     targets: [
         .executableTarget(