gistfile1.txt

$ 8g append.go && 8l -o goappend append.8 && time ./goappend
Elapsed time: 0.18
1.5000704643886663e+07

real	0m4.944s
user	0m4.664s
sys	0m0.236s
$ cat append.go
package main

import (
"fmt"
"rand"
"time"
)

const _LIST_SIZE int64 = 30000000

func main() {
  nn := make([]float64, _LIST_SIZE)
  for i := int64(0); i < _LIST_SIZE; i++ {
    nn[i] = rand.Float64()
  }
  sum := float64(0.0)
  time1 := time.Nanoseconds()
  for _, v := range nn {
    sum += v
  }
  elapsed := float32(time.Nanoseconds() - time1) / 1e9
  fmt.Printf("Elapsed time: %.2f\n", elapsed)
  fmt.Println(sum)
}
$