Multiplatform benchmarks baseline (#4350)

Update kotlinx-benchmark-based setup in kotlinx-coroutines-core and add a basic zero-contention benchmark for locks

Author: qwwdfsad

buildSrc/build.gradle.kts

@@ -63,7 +63,7 @@ dependencies {
         exclude(group = "org.jetbrains.kotlin", module = "kotlin-stdlib-jdk7")
         exclude(group = "org.jetbrains.kotlin", module = "kotlin-stdlib")
     }
-    implementation("org.jetbrains.kotlinx:kotlinx-benchmark-plugin:0.4.9")
+    implementation("org.jetbrains.kotlinx:kotlinx-benchmark-plugin:${version("benchmarks")}")
     implementation("org.jetbrains.kotlinx:kotlinx-knit:${version("knit")}")
     implementation("org.jetbrains.kotlinx:atomicfu-gradle-plugin:${version("atomicfu")}")
 }

gradle.properties

@@ -4,6 +4,8 @@ group=org.jetbrains.kotlinx
 kotlin_version=2.1.0
 # DO NOT rename this property without adapting kotlinx.train build chain:
 atomicfu_version=0.26.1
+benchmarks_version=0.4.13
+benchmarks_jmh_version=1.37
 
 # Dependencies
 junit_version=4.12

kotlinx-coroutines-core/benchmarks/README.md

@@ -0,0 +1,21 @@
+## kotlinx-coroutines-core benchmarks
+
+Multiplatform benchmarks for kotlinx-coroutines-core.
+
+This source-set contains benchmarks that leverage `internal` API (e.g. `suspendCancellableCoroutineReusable`) or
+that are multiplatform (-> only supported with `kotlinx-benchmarks` which is less convenient than `jmh` plugin).
+For JVM-only non-internal benchmarks, consider using `benchmarks` top-level project.
+
+### Usage
+
+```
+// JVM only
+./gradlew :kotlinx-coroutines-core:jvmBenchmarkBenchmarkJar
+java -jar kotlinx-coroutines-core/build/benchmarks/jvmBenchmark/jars/kotlinx-coroutines-core-jvmBenchmark-jmh-*-JMH.jar
+
+// Native, OS X
+./gradlew :kotlinx-coroutines-core:macosArm64BenchmarkBenchmark
+
+// Figure out what to use
+./gradlew :kotlinx-coroutines-core:tasks | grep -i bench
+```

kotlinx-coroutines-core/jvmBenchmark/kotlin/kotlinx/coroutines/BenchmarkUtils.kt renamed to kotlinx-coroutines-core/benchmarks/jvm/kotlin/kotlinx/coroutines/BenchmarkUtils.kt

@@ -76,7 +76,7 @@ open class SemaphoreBenchmark {
 
 enum class SemaphoreBenchDispatcherCreator(val create: (parallelism: Int) -> CoroutineDispatcher) {
     FORK_JOIN({ parallelism -> ForkJoinPool(parallelism).asCoroutineDispatcher() }),
-    DEFAULT({ parallelism -> ExperimentalCoroutineDispatcher(corePoolSize = parallelism, maxPoolSize = parallelism) })
+    DEFAULT({ parallelism -> CoroutineScheduler(corePoolSize = parallelism, maxPoolSize = parallelism).asCoroutineDispatcher() })
 }
 
 private const val WORK_INSIDE = 50

kotlinx-coroutines-core/jvmBenchmark/kotlin/kotlinx/coroutines/SemaphoreBenchmark.kt renamed to kotlinx-coroutines-core/benchmarks/jvm/kotlin/kotlinx/coroutines/SemaphoreBenchmark.kt

@@ -133,7 +133,7 @@ open class ChannelProducerConsumerBenchmark {
 
 enum class DispatcherCreator(val create: (parallelism: Int) -> CoroutineDispatcher) {
     FORK_JOIN({ parallelism ->  ForkJoinPool(parallelism).asCoroutineDispatcher() }),
-    DEFAULT({ parallelism -> ExperimentalCoroutineDispatcher(corePoolSize = parallelism, maxPoolSize = parallelism) })
+    DEFAULT({ parallelism -> CoroutineScheduler(corePoolSize = parallelism, maxPoolSize = parallelism).asCoroutineDispatcher() })
 }
 
 enum class ChannelCreator(private val capacity: Int) {