Simple Benchmark of Summation in C and Swift

!benchmark_swift_c_summation.ipynb

main.c

#include <time.h>
#include <stdio.h>


int main () {
    const int N = 300000;
    int64_t buffer[N];

    for (int test = 0; test < 15; test++) {
        clock_t start = clock();

        for (int i = 0; i < N; i++) {
           buffer[i] = test;
        }
        int64_t sum = 0;
        for (int i = 0; i < N; i++) {
            sum += buffer[i];
        }

        printf("%.3f ms  %llu\n", ((double)(clock() - start)) / CLOCKS_PER_SEC * 1000, sum);
    }

    return 0;
}

main.swift

import Foundation


let N = 300_000
var buffer = [Int64](repeating: 0, count: N)

for test: Int64 in 0 ..< 15 {
    let start = Date()

    buffer.withUnsafeMutableBufferPointer { buffer in
        for i in 0 ..< N {
            buffer[i] = test
        }
    }
    let sum = buffer.reduce(0, &+)

    print("\(String(format: "%.3f", Date().timeIntervalSince(start) * 1_000)) ms  \(sum)")
}