//需要33.2ns,考虑到仅计算Generate需要20ns,应该没有优化空间了
func BenchmarkLcgCalculateConstants(b *testing.B) {
//t := kmgTest.NewTestTools(b)
r := uint64(b.N)
a, c := LcgCalculateConstants(r, 0)
f := kmgRand.LcgTransformer{
Start: 0,
Range: r,
A: a,
C: c,
}
hasValueMap := make([]bool, r)
for i := uint64(0); i < r; i++ {
out := f.GenerateInRange(i)
hasValueMap[int(out)] = true
}
for i := uint64(0); i < r; i++ {
//t.Equal(hasValueMap[i],true) //使用快捷方法需要120ns
if !hasValueMap[i] {
b.Fatalf("[BenchmarkLcgCalculateConstants] value %d not generate", i)
}
}
}
func isRandomNess(f kmgRand.LcgTransformer) bool {
for _, i := range []uint64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10} {
if int64abs(f.GenerateInRange(i)-f.GenerateInRange(0)) < 1e6 &&
int64abs(f.GenerateInRange(2*i)-f.GenerateInRange(i)) < 1e6 {
return false
}
}
return true
}
func TestLcgCalculateConstants(ot *testing.T) {
r := uint64(1e4)
a, c := LcgCalculateConstants(r, 0)
f := kmgRand.LcgTransformer{
Start: 0,
Range: r,
A: a,
C: c,
}
hasValueMap := make([]bool, r)
for i := uint64(0); i < r; i++ {
out := f.GenerateInRange(i)
hasValueMap[int(out)] = true
}
for i := uint64(0); i < r; i++ {
if hasValueMap[i] != true {
ot.Fatalf("[BenchmarkLcgCalculateConstants] value %d not generate", i)
}
}
/*
验证某个实际参数是正确的
r = 1e8
f = kmgRand.LcgTransformer{
Start: 0,
Range: 1e8,
A: 671088641,
C: 2531011,
}
hasValueMap = make([]bool, r)
for i := uint64(0); i < r; i++ {
out:= f.GenerateInRange(i)
hasValueMap[int(out)] = true
}
for i := uint64(0); i < r; i++ {
if hasValueMap[i]!=true{
ot.Fatalf("[BenchmarkLcgCalculateConstants] value %d not generate",i)
}
}
*/
/*
修正计算参数
r= uint64(1e8)
a, c = LcgCalculateConstants(r, 0)
for ;a<1e9;a=(a-1)*2+1{
f = kmgRand.LcgTransformer{
Start: 1e8,
Range: r,
A: a,
C: c,
}
if !isRandomNess(f){
continue
}
fmt.Println(r,a,c)
for i := uint64(0); i < 100; i++ {
out:= f.GenerateInRange(i)
fmt.Printf("%d ",out)
}
fmt.Println()
}
*/
}
