Json benchmarks (#1337)

* Introduce lightweight twitter-feed benchmark
* Introduce benchmark that does a basic comparison with Jackson mapper
* Introduce benchmark that stresses primitives parsing
* Introduce more macro benchmarks

benchmark/build.gradle

@@ -8,7 +8,7 @@ apply plugin: "me.champeau.gradle.jmh"
 
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
-jmh.jmhVersion = 1.21
+jmh.jmhVersion = 1.22
 
 if (rootProject.ext.jvm_ir_enabled) {
     kotlin.target.compilations.all {
@@ -20,26 +20,15 @@ jmhJar {
     baseName 'benchmarks'
     classifier = null
     version = null
+    destinationDir = file("$rootDir")
 }
 
 dependencies {
-    annotationProcessor 'com.google.auto.value:auto-value:1.4.1'
-    annotationProcessor 'com.ryanharter.auto.value:auto-value-gson:0.4.6'
-
-    compileOnly 'com.google.auto.value:auto-value:1.4.1'
-    compileOnly 'com.ryanharter.auto.value:auto-value-gson:0.4.6'
-
     compile "org.openjdk.jmh:jmh-core:1.22"
     implementation 'com.google.guava:guava:24.1.1-jre'
-
-    compile 'com.squareup.okio:okio:1.13.0'
-    compile 'com.google.code.gson:gson:2.8.1'
-    compile 'com.esotericsoftware:kryo:4.0.0'
-
+    compile 'com.fasterxml.jackson.core:jackson-databind:2.12.1'
+    compile 'com.fasterxml.jackson.module:jackson-module-kotlin:2.12.1'
     compile project(':kotlinx-serialization-core')
     compile project(':kotlinx-serialization-json')
     compile project(':kotlinx-serialization-protobuf')
-
-    // async profiler
-    compile group: 'pl.project13.scala', name: 'sbt-jmh-extras', version: '0.3.3'
 }

benchmark/src/jmh/kotlin/kotlinx/benchmarks/json/CitmBenchmark.kt

@@ -0,0 +1,23 @@
+package kotlinx.benchmarks.json
+
+import kotlinx.benchmarks.model.*
+import kotlinx.serialization.json.*
+import org.openjdk.jmh.annotations.*
+import java.util.concurrent.*
+
+@Warmup(iterations = 7, time = 1)
+@Measurement(iterations = 7, time = 1)
+@BenchmarkMode(Mode.Throughput)
+@OutputTimeUnit(TimeUnit.SECONDS)
+@State(Scope.Benchmark)
+@Fork(2)
+open class CitmBenchmark {
+    /*
+     * For some reason Citm is kind of de-facto standard cross-language benchmark.
+     * Order of magnitude: 200 ops/sec
+     */
+    private val citm = CitmBenchmark::class.java.getResource("/citm_catalog.json").readBytes().decodeToString()
+
+    @Benchmark
+    fun decodeCitm(): CitmCatalog = Json.decodeFromString(CitmCatalog.serializer(), citm)
+}