arrayslice_test.go

package arrayslice
 
import "testing"
 
func BenchmarkArray8for(b *testing.B) {
        var a [8]int
        for i := 0 ; i < b.N ; i++ {
                for j := 0 ; j < len(a) ; j++ {
                        a[j] += j
                }
        }
}

func BenchmarkArray8unrolled(b *testing.B) {
        var a [8]int
        for i := 0 ; i < b.N ; i++ {
                a[0] += 0
                a[1] += 1
                a[2] += 2
                a[3] += 3
                a[4] += 4
                a[5] += 5
                a[6] += 6
                a[7] += 7
        }
}
 
func BenchmarkArray8range(b *testing.B) {
        var a [8]int
        for i := 0 ; i < b.N ; i++ {
                for i := range a {
                        a[i] += i
                }
        }
}
 
func BenchmarkSlice8for(b *testing.B) {
        var s = []int{0,0,0,0,0,0,0,0}
        for i := 0; i < b.N ; i++ {
                for j, n := 0, len(s) ; j < n; j++ {
                        s[j] += j
                }
        }
}

func BenchmarkSlice8unrolled(b *testing.B) {
        var s = []int{0,0,0,0,0,0,0,0}
        for i := 0 ; i < b.N ; i++ {
                s[0] += 0
                s[1] += 1
                s[2] += 2
                s[3] += 3
                s[4] += 4
                s[5] += 5
                s[6] += 6
                s[7] += 7
        }
}
 
func BenchmarkSlice8range(b *testing.B) {
        var s = []int{0,0,0,0,0,0,0,0}
        for i := 0; i < b.N ; i++ {
                for i := range s {
                        s[i] += i
                }
        }
}
 
func BenchmarkStruct8(b *testing.B) {
        var t = struct { i0, i1, i2, i3, i4, i5, i6, i7 int }{}
        for i := 0; i < b.N ; i++ {
                t.i0 += 0
                t.i1 += 1
                t.i2 += 2
                t.i3 += 3
                t.i4 += 4
                t.i5 += 5
                t.i6 += 6
                t.i7 += 7
        }
}

gistfile1.txt

lucky(~/src/github.com/davecheney/arrayslice) % go test -bench=.
testing: warning: no tests to run
PASS
BenchmarkArray8for      500000000                7.92 ns/op
BenchmarkArray8range    100000000               10.7 ns/op
BenchmarkSlice8for      200000000                8.76 ns/op
BenchmarkSlice8range    200000000                8.66 ns/op
BenchmarkStruct8        1000000000               2.70 ns/op
ok      github.com/davecheney/arrayslice        14.076s

go test -bench=.
testing: warning: no tests to run
PASS
BenchmarkArray8for      100000000               17.3 ns/op
BenchmarkArray8unrolled 500000000                5.56 ns/op
BenchmarkArray8range    100000000               18.9 ns/op
BenchmarkSlice8for      100000000               26.1 ns/op
BenchmarkSlice8unrolled 50000000                20.9 ns/op
BenchmarkSlice8range    50000000                25.0 ns/op
BenchmarkStruct8        500000000                5.86 ns/op
ok      _/C_/Users/Vendan/Documents/evecombot/array_slice       16.806s