package main

import (
    "fmt"
    "math/rand"
    "time"
)

const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 abcdefghijklmnopqrstuvwxyz" +
    "~!@#$%^&*()-_+={}[]\\|<,>.?/\"';:`"

const Maxlen = 1024

func RandStrings(N int) []string {
    r := make([]string, N)
    ri := 0
    buf := make([]byte, Maxlen)
    known := map[string]bool{}

    for i := 0; i < N; i++ {
    retry:
        l := rand.Intn(Maxlen)
        for j := 0; j < l; j++ {
            buf[j] = chars[rand.Intn(len(chars))]
        }
        s := string(buf[0:l])
        if known[s] {
            goto retry
        }
        known[s] = true
        r[ri] = s
        ri++
    }
    return r
}

func timeTrack(start time.Time, name string, num int, dbtype string) {
    elapsed := time.Since(start)
    fmt.Println(name, elapsed, "throughput:", int64(float64(num)/(elapsed.Seconds())), "/sec\n")
}

func runbench(t string, n int) {
    defer timeTrack(time.Now(), fmt.Sprintf("%d strings, type %s", n, t), n, t)
    for i := 0; i < n; i++ {
        r := RandStrings(2)
        _ = r
    }
}

func main() {
    iter := 64000000
    incr := 1000
    for i := incr; i < iter+1; i = incr {
        runbench("t", i)
        incr = 2 * i
    }
}