performanceTest.kt

import kotlinx.coroutines.*
import kotlin.system.measureTimeMillis
suspend fun performanceTest() {
    val data = List(1000) { it }
    
    // Sequential processing
    val sequentialTime = measureTimeMillis {
        data.forEach { item ->
            delay(10)
            // process item
        }
    }
    println("Sequential: $sequentialTime ms")
    
    // Parallel with Default dispatcher
    val parallelDefaultTime = measureTimeMillis {
        coroutineScope {
            data.map { item ->
                async(Dispatchers.Default) {
                    delay(10)
                    // process item
                }
            }.awaitAll()
        }
    }
    println("Parallel (Default): $parallelDefaultTime ms")
    
    // Parallel with IO dispatcher
    val parallelIOTime = measureTimeMillis {
        coroutineScope {
            data.map { item ->
                async(Dispatchers.IO) {
                    delay(10)
                    // process item
                }
            }.awaitAll()
        }
    }
    println("Parallel (IO): $parallelIOTime ms")
}
fun main() = runBlocking {
    performanceTest()
}
/* Expected output:
Sequential: ~10000 ms
Parallel (Default): ~1250 ms (limited by CPU cores)
Parallel (IO): ~200 ms (can have 64 concurrent operations)
*/