profiler-sample-kotlin.kt

import davidoh.profiling.*
import java.security.MessageDigest
import kotlin.math.sqrt

fun main() {
    val profiler: Profiler = SimpleProfiler(resetAfterSampleCount = 200000)

    println("app started")

    profiler.startSection("init")
    val md5 = MessageDigest.getInstance("MD5")
    val sha1 = MessageDigest.getInstance("SHA-1")
    val sha256 = MessageDigest.getInstance("SHA-256")
    val r = java.util.Random()
    val bytes = ByteArray(10000)
    r.nextBytes(bytes)
    profiler.endSection()

    while (true) {
        profiler.startSection("total")

        profiler.startSection("hashing")

        profiler.startSection("md5")
        md5.digest(bytes)
        profiler.endSection()

        profiler.startSection("sha256")
        sha256.digest(bytes)
        profiler.endSection()

        profiler.startSection("sha1")
        sha1.digest(bytes)
        profiler.endSection()

        profiler.endSection("hashing")

        profiler.startSection("random")
        val randNum = r.nextDouble() * 1000000 + 1
        profiler.endSection()

        profiler.startSection("sqrt")
        sqrt(randNum)
        profiler.endSection()

        profiler.endSection("total")
        if (profiler.report(10))
            println("-----")
    }
}