package main

import (
    "fmt"
    "os"

    "github.com/edsrzf/mmap-go"
    )

func main() {
    n := 1000
    t := 32 * n

    map_file, _ := os.Create("/tmp/test.dat")
    _, _ = map_file.Seek(int64(t - 1), 0)
    map_file.Write([]byte(" "))
    defer map_file.Close()

    mmap, _ := mmap.Map(map_file, mmap.RDWR, 0)

    for i := 0; i < n; i++ {
        mmap[i] = byte(i*i)
    }

    fmt.Println(mmap)
}