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hashconflict.go
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/
hashconflict.go
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package main
import (
"fmt"
"github.com/hetianyi/gox"
"github.com/hetianyi/gox/convert"
"github.com/hetianyi/gox/hash/hashcode"
"github.com/hetianyi/gox/logger"
"os"
)
func main() {
var (
slotNum int // 16777216
caseSize int
hashs = make(map[int]int)
slotMap []byte
)
logger.Init(nil)
if len(os.Args) < 3 {
logger.Fatal("Usage: ./<app> <slotNum> <caseSize>")
}
sn := os.Args[1]
cs := os.Args[2]
_slotNum, err := convert.StrToInt(sn)
if err != nil {
logger.Fatal(err)
}
slotNum = _slotNum
slotMap = make([]byte, slotNum)
_caseSize, err := convert.StrToInt(cs)
if err != nil {
logger.Fatal(err)
}
caseSize = _caseSize
logger.Info("start")
for i := 0; i < caseSize; i++ {
key := gox.Md5Sum(convert.IntToStr(i))
h := hashcode.HashCode(key)
h = h ^ (h >> 16)
index := (slotNum - 1) & int(h)
slotMap[index] = 1
hashs[index] = hashs[index] + 1
}
logger.Info("end")
total := 0
for _, v := range slotMap {
total += int(v)
}
fmt.Println("empty slots: ", slotNum-total)
fmt.Println("slots usage: ", convert.Float64ToStr(float64(total) / float64(slotNum) * 100)[0:6]+"%")
fmt.Println("unique hash: ", len(hashs))
fmt.Println("collision percent: ", convert.Float64ToStr(float64(caseSize-len(hashs))*100/float64(caseSize))+"%")
}