python/go/swift vs

test_go.go

package main
import "fmt"

var sum = 0
func main() {
    for e := 0; e < 30; e++ {
        sum = 0
        var x[]int
        for i := 0; i < 1000000; i++ {
            x = append(x, i)
        }

        var y[]int
        for i := 0; i < 1000000-1; i++ {
            y = append(y, x[i] + x[i+1])
        }

        for i := 0; i < 1000000; i+=100 {
            sum += y[i]
        }
    }
    fmt.Println(sum)
}

test_python.py

#!/usr/bin python

sum = 0

for e in xrange(30):
    sum = 0
    x = []

    for i in xrange(1000000):
        x.append(i)

    y = []
    for i in xrange(1000000 - 1):
        y.append(x[i] + x[i+1])

    i = 0
    for i in xrange(0, 1000000, 100):
        sum += y[i]

print sum

test_swift.swift

#!/usr/bin/xcrun swift

var sum = 0
for e in 0..<30 {
    sum = 0
    var x: Array<Int> = []

    for (var i=0; i<1000_000; i++) {
        x.append(i)
    }

    var y: Array<Int> = []
    for (var i=0; i<1000_000-1; i++) {
        y.append(x[i] + x[i+1])
    }

    for (var i=0; i<1000_000; i+=100){
        sum += y[i]
    }
}

print(sum)

➜ 63c1c4743b11126b848c22b208767254 git:(master) time go run test_go.go
9999010000
go run test_go.go 0.88s user 0.09s system 91% cpu 1.068 total

➜ 63c1c4743b11126b848c22b208767254 git:(master) time ./test_swift.swift
9999010000
./test_swift.swift 1.85s user 0.59s system 97% cpu 2.508 total

➜ 63c1c4743b11126b848c22b208767254 git:(master) time python test_python.py
9999010000
python test_python.py 11.73s user 0.64s system 92% cpu 13.312 total