Iteration benchmark

chan.go

package iteration

func fiboChan(n int) <-chan int {
        c := make(chan int)

        go func() {
                a := 0
                b := 1
                for i := 0; i < n; i++ {
                        a, b = b, a+b
                        c <- a
                }
                close(c)
        }()

        return c
}

chan_test.go

package iteration

import "testing"

func BenchmarkFiboChan(b *testing.B) {
        for j := 0; j < b.N/10000; j++ {
                c := fiboChan(10000)
                for i := range c {
                        _ = i
                }
        }
}

iter.go

package iteration

type FiboIter struct {
        a, b int
}

func NewFiboIter() FiboIter {
        return FiboIter{0, 1}
}

func (c *FiboIter) Next() int {
        c.a, c.b = c.b, c.a+c.b
        return c.a
}

iter_test.go

package iteration

import "testing"

func BenchmarkFiboIter(b *testing.B) {
        for j := 0; j < b.N/10000; j++ {
                c := NewFiboIter()
                for i := 0; i < 10000; i++ {
                        _ = c.Next()
                }
        }
}

result.txt

u0_a99@localhost ~/p/g/src> go test -bench . -cpu 1 -count 10 iteration
goos: android
goarch: arm64
pkg: iteration
BenchmarkFiboChan        5000000               266 ns/op
BenchmarkFiboChan        5000000               347 ns/op
BenchmarkFiboChan        5000000               271 ns/op
BenchmarkFiboChan        5000000               274 ns/op
BenchmarkFiboChan        5000000               273 ns/op
BenchmarkFiboChan        5000000               294 ns/op
BenchmarkFiboChan        5000000               288 ns/op
BenchmarkFiboChan        5000000               275 ns/op
BenchmarkFiboChan        5000000               286 ns/op
BenchmarkFiboChan        5000000               285 ns/op
BenchmarkFiboIter       2000000000               1.16 ns/op
BenchmarkFiboIter       2000000000               1.17 ns/op
BenchmarkFiboIter       2000000000               1.11 ns/op
BenchmarkFiboIter       2000000000               1.13 ns/op
BenchmarkFiboIter       2000000000               1.18 ns/op
BenchmarkFiboIter       2000000000               1.18 ns/op
BenchmarkFiboIter       2000000000               1.15 ns/op
BenchmarkFiboIter       2000000000               1.18 ns/op
BenchmarkFiboIter       2000000000               1.18 ns/op
BenchmarkFiboIter       2000000000               1.15 ns/op
BenchmarkFiboSlice      500000000                3.38 ns/op
BenchmarkFiboSlice      500000000                3.38 ns/op
BenchmarkFiboSlice      500000000                3.35 ns/op
BenchmarkFiboSlice      500000000                3.33 ns/op
BenchmarkFiboSlice      500000000                3.28 ns/op
BenchmarkFiboSlice      500000000                3.44 ns/op
BenchmarkFiboSlice      500000000                3.37 ns/op
BenchmarkFiboSlice      500000000                3.33 ns/op
BenchmarkFiboSlice      500000000                3.40 ns/op
BenchmarkFiboSlice      500000000                3.42 ns/op
PASS
ok      iteration       62.201s
u0_a99@localhost ~/p/g/src>

slice.go

package iteration

func fiboSlice(n int) []int {
        result := make([]int, n)

        a := 0
        b := 1
        for i := 0; i < n; i++ {
                a, b = b, a+b
                result[i] = a
        }

        return result
}

slice_test.go

package iteration

import "testing"

func BenchmarkFiboSlice(b *testing.B) {
        for j := 0; j < b.N/10000; j++ {
                c := fiboSlice(10000)
                for _, i := range c {
                        _ = i
                }
        }
}