kmath/benchmarks/src/main/kotlin/scientifik/kmath/structures/StructureReadBenchmark.kt

package scientifik.kmath.structures

import kotlin.system.measureTimeMillis

fun main(args: Array<String>) {
    val n = 6000

    val array = DoubleArray(n * n) { 1.0 }
    val buffer = DoubleBuffer(array)
    val strides = DefaultStrides(intArrayOf(n, n))

    val structure = BufferNDStructure(strides, buffer)

    measureTimeMillis {
        var res: Double = 0.0
        strides.indices().forEach { res = structure[it] }
    } // warmup

    val time1 = measureTimeMillis {
        var res: Double = 0.0
        strides.indices().forEach { res = structure[it] }
    }
    println("Structure reading finished in $time1 millis")

    val time2 = measureTimeMillis {
        var res: Double = 0.0
        strides.indices().forEach { res = buffer[strides.offset(it)] }
    }
    println("Buffer reading finished in $time2 millis")

    val time3 = measureTimeMillis {
        var res: Double = 0.0
        strides.indices().forEach { res = array[strides.offset(it)] }
    }
    println("Array reading finished in $time3 millis")
}