1 files changed, 69 insertions, 0 deletions
diff --git a/benchmark/src/jmh/kotlin/kotlinx/benchmarks/json/LookupOverheadBenchmark.kt b/benchmark/src/jmh/kotlin/kotlinx/benchmarks/json/LookupOverheadBenchmark.kt
new file mode 100644
index 00000000..ddfc5792
--- /dev/null
+++ b/benchmark/src/jmh/kotlin/kotlinx/benchmarks/json/LookupOverheadBenchmark.kt
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2017-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package kotlinx.benchmarks.json
+
+import kotlinx.serialization.*
+import kotlinx.serialization.builtins.*
+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.MICROSECONDS)
+@State(Scope.Benchmark)
+@Fork(2)
+open class LookupOverheadBenchmark {
+
+    @Serializable
+    class Holder(val a: String)
+
+    @Serializable
+    class Generic<T>(val a: T)
+
+    @Serializable
+    class DoubleGeneric<T1, T2>(val a: T1, val b: T2)
+
+    @Serializable
+    class PentaGeneric<T1, T2, T3, T4, T5>(val a: T1, val b: T2, val c: T3, val d: T4, val e: T5)
+
+    private val data = """{"a":""}"""
+    private val doubleData = """{"a":"","b":0}"""
+    private val pentaData = """{"a":"","b":0,"c":1,"d":true,"e":" "}"""
+
+    @Serializable
+    object Object
+
+    @Benchmark
+    fun dataReified() = Json.decodeFromString<Holder>(data)
+
+    @Benchmark
+    fun dataPlain() = Json.decodeFromString(Holder.serializer(), data)
+
+    @Benchmark
+    fun genericReified() = Json.decodeFromString<Generic<String>>(data)
+
+    @Benchmark
+    fun genericPlain() = Json.decodeFromString(Generic.serializer(String.serializer()), data)
+
+    @Benchmark
+    fun doubleGenericReified() = Json.decodeFromString<DoubleGeneric<String, Int>>(doubleData)
+
+    @Benchmark
+    fun doubleGenericPlain() = Json.decodeFromString(DoubleGeneric.serializer(String.serializer(), Int.serializer()), doubleData)
+
+    @Benchmark
+    fun pentaGenericReified() = Json.decodeFromString<PentaGeneric<String, Int, Long, Boolean, Char>>(pentaData)
+
+    @Benchmark
+    fun pentaGenericPlain() = Json.decodeFromString(PentaGeneric.serializer(String.serializer(), Int.serializer(), Long.serializer(), Boolean.serializer(), Char.serializer()), pentaData)
+
+    @Benchmark
+    fun objectReified() = Json.decodeFromString<Object>("{}")
+
+    @Benchmark
+    fun objectPlain() = Json.decodeFromString(Object.serializer(), "{}")
+}