Benchmark interface map and origin type map

typeAssert_test.go

package main

import (
        "fmt"
        "testing"
)

type Tester interface {
        T() string
}

type TesterI struct {
        te string
}

func (t *TesterI) T() string {
        return t.te
}

var (
        ti map[string]Tester
        to map[string]*TesterI
)

func loadTiData() map[string]Tester {
        ti = make(map[string]Tester)
        for i := 0; i < 1000000; i++ {
                t := &TesterI{te: fmt.Sprintf("t-%d", i)}
                ti[t.te] = t
        }
        return ti
}

func loadToData() map[string]*TesterI {
        to = make(map[string]*TesterI)
        for i := 0; i < 1000000; i++ {
                t := &TesterI{te: fmt.Sprintf("t-%d", i)}
                to[t.te] = t
        }
        return to
}

func getTiCnt() int {
        count := 0
        for _, v := range ti {
                switch v.(type) {
                case *TesterI:
                        count++
                }
        }
        return count
}

func getTiCnt2() int {
        return len(ti)
}

func getToCnt() int {
        count := 0
        for _ = range to {
                count++
        }
        return count
}

func getToCnt2() int {
        return len(to)
}

func BenchmarkTi(b *testing.B) {
        loadTiData()

        b.ResetTimer()
        b.SetBytes(20)
        for i := 0; i < b.N; i++ {
                getTiCnt()
        }
}

func BenchmarkTi2(b *testing.B) {
        loadTiData()

        b.ResetTimer()
        b.SetBytes(20)
        for i := 0; i < b.N; i++ {
                getTiCnt2()
        }
}

func BenchmarkTo(b *testing.B) {
        loadToData()

        b.ResetTimer()
        b.SetBytes(20)
        for i := 0; i < b.N; i++ {
                getToCnt()
        }
}

func BenchmarkTo2(b *testing.B) {
        loadToData()

        b.ResetTimer()
        b.SetBytes(20)
        for i := 0; i < b.N; i++ {
                getToCnt2()
        }
}

goos: darwin
goarch: amd64
pkg: test
BenchmarkTi-4                100          19688482 ns/op           0.00 MB/s           0 B/op          0 allocs/op
BenchmarkTi2-4          2000000000               0.34 ns/op     58209.11 MB/s          0 B/op          0 allocs/op
BenchmarkTo-4                100          19319888 ns/op           0.00 MB/s           0 B/op          0 allocs/op
BenchmarkTo2-4          2000000000               0.35 ns/op     57598.29 MB/s          0 B/op          0 allocs/op
PASS
ok      test    23.197s