Test.kt

import java.util.Base64

val STR_SIZE = 131072
val TRIES = 8192

val enc = Base64.getEncoder();
val dec = Base64.getDecoder();

fun notify(msg: String) {
    try {
        java.net.Socket("localhost", 9001).getOutputStream().use {
            it.write(msg.toByteArray())
        }
    } catch (e: java.io.IOException) {
        // standalone usage
    }
}

fun main(args: Array<String>) {
    val str = "a".repeat(STR_SIZE).toByteArray()

    println("JIT warming up")
    repeat(5) {
        dec.decode(enc.encodeToString(str))
    }

    val pid = ProcessHandle.current().pid()
    notify("Kotlin\t${pid}")

    var count1 = 0
    val t1 = System.nanoTime()

    var encStr = enc.encodeToString(str)
    print("encode ${String(str.sliceArray(1..4))}... to ${encStr.substring(0, 4)}...: ")

    repeat(TRIES) {
        encStr = enc.encodeToString(str)
        count1 += encStr.length
    }
    println("${count1}, ${(System.nanoTime() - t1) / 1e9}")

    var decBytes = dec.decode(encStr)
    print("decode ${encStr.substring(0, 4)}... to ${String(decBytes.sliceArray(1..4))}...: ")
    var count2 = 0

    val t2 = System.nanoTime()
    repeat(TRIES) {
        decBytes = dec.decode(encStr)
        count2 += decBytes.size
    }
    val now = System.nanoTime()
    println("${count2}, ${(now - t2) / 1e9}")
    println("overall time: ${(now - t1) / 1e9}s")
    notify("stop")
}