Swift: add, append 속도 비교

n이 커질 수록 append가 속도 면에서 더 빨라지는 추세

 

 

import SwiftUI

struct ContentView: View {
    @State var count = 1

    var body: some View {
        VStack {
            Button("count up") {
                count *= 10
            }

            Button("act") {
                print("count:", count)

                DispatchQueue.global(qos: .default).async {
                    var array1: [Int] = []

                    measure(label: "addTest", repeatCount: count) {
                        addTest(array: &array1)
                    }
                }

                DispatchQueue.global(qos: .default).async {
                    var array2: [Int] = []

                    measure(label: "appendTest", repeatCount: count) {
                        appendTest(array: &array2)
                    }
                }
            }
        }
    }
}

func addTest(array: inout [Int]) { array += [1] }
func appendTest(array: inout [Int]) { array.append(1) }

func measure(label: String, repeatCount: Int, function: () -> ()) {
    let time = ContinuousClock().measure { for _ in 1...repeatCount { function() } }
    print(label, ":", time)
}

count: 1
addTest : 3.8833e-05 seconds
appendTest : 3.9833e-05 seconds
count: 10
appendTest : 1.3625e-05 seconds
addTest : 2.3042e-05 seconds
count: 100
addTest : 0.000171959 seconds
appendTest : 6.8292e-05 seconds
count: 1000
appendTest : 0.00031825 seconds
addTest : 0.000650166 seconds
count: 10000
appendTest : 0.003383875 seconds
addTest : 0.005933375 seconds
count: 100000
appendTest : 0.033002375 seconds
addTest : 0.057534667 seconds
count: 1000000
appendTest : 0.1975555 seconds
addTest : 0.372229417 seconds
count: 10000000
appendTest : 1.748122291 seconds
addTest : 3.475922875 seconds
count: 100000000
appendTest : 17.335491125 seconds
addTest : 34.491072791 seconds
count: 1000000000
appendTest : 178.26301329199998 seconds
addTest : 352.920505958 seconds