kmath-core/build.gradle

@@ -1,6 +1,5 @@
 plugins {
-    id 'kotlin-multiplatform'// version '1.3.0-rc-116'
-    id "me.champeau.gradle.jmh" version "0.4.7"
+    id 'kotlin-multiplatform'
 }
 
 repositories {
@@ -8,14 +7,9 @@ repositories {
     mavenCentral()
 }
 
-dependencies{
-    jmh 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'
-}
-
 kotlin {
     targets {
-        fromPreset(presets.jvmWithJava, 'jvm')
-        //fromPreset(presets.jvm, 'jvm')
+        fromPreset(presets.jvm, 'jvm')
         fromPreset(presets.js, 'js')
         // For ARM, preset should be changed to presets.iosArm32 or presets.iosArm64
         // For Linux, preset should be changed to e.g. presets.linuxX64

kmath-jmh/build.gradle

@@ -0,0 +1,15 @@
+plugins {
+    id "java"
+    id "kotlin"
+    id "me.champeau.gradle.jmh" version "0.4.7"
+}
+
+repositories {
+    maven { url = 'http://dl.bintray.com/kotlin/kotlin-eap' }
+    mavenCentral()
+}
+
+dependencies {
+    implementation project(':kmath-core')
+    jmh 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'
+}

kmath-jmh/src/jmh/kotlin/scientifik/kmath/structures/ArrayBenchmark.kt

@@ -0,0 +1,53 @@
+package scientifik.kmath.structures
+
+import org.openjdk.jmh.annotations.*
+import java.nio.IntBuffer
+
+
+@Fork(1)
+@Warmup(iterations = 2)
+@Measurement(iterations = 5)
+@State(Scope.Benchmark)
+open class ArrayBenchmark {
+
+    lateinit var array: IntArray
+    lateinit var arrayBuffer: IntBuffer
+    lateinit var nativeBuffer: IntBuffer
+
+    @Setup
+    fun setup() {
+        array = IntArray(10000) { it }
+        arrayBuffer = IntBuffer.wrap(array)
+        nativeBuffer = IntBuffer.allocate(10000)
+        for (i in 0 until 10000) {
+            nativeBuffer.put(i,i)
+        }
+    }
+
+    @Benchmark
+    fun benchmarkArrayRead() {
+        var res = 0
+        for (i in 1..10000) {
+            res += array[10000 - i]
+        }
+        print(res)
+    }
+
+    @Benchmark
+    fun benchmarkBufferRead() {
+        var res = 0
+        for (i in 1..10000) {
+            res += arrayBuffer.get(10000 - i)
+        }
+        print(res)
+    }
+
+    @Benchmark
+    fun nativeBufferRead() {
+        var res = 0
+        for (i in 1..10000) {
+            res += nativeBuffer.get(10000 - i)
+        }
+        print(res)
+    }
+}

settings.gradle

@@ -10,4 +10,5 @@ enableFeaturePreview('GRADLE_METADATA')
 
 rootProject.name = 'kmath'
 include ':kmath-core'
+include ':kmath-jmh'