golang 1.10.0 strings.Builder benchmark

result.txt

goos: linux
goarch: amd64
pkg: github.com/knsh14/sample
BenchmarkBytesBufferString/10-2             	  100000	     12086 ns/op	    1984 B/op	      13 allocs/op
BenchmarkBytesBufferString/50-2             	  100000	     17160 ns/op	    7744 B/op	      53 allocs/op
BenchmarkBytesBufferString/100-2            	  100000	     24451 ns/op	   14944 B/op	     103 allocs/op
BenchmarkBytesBufferString/200-2            	   50000	     30369 ns/op	   29344 B/op	     203 allocs/op
BenchmarkBytesBufferString/500-2            	   30000	     56428 ns/op	   72544 B/op	     503 allocs/op
BenchmarkStringsBuilderString/10-2          	  200000	      9501 ns/op	     256 B/op	       5 allocs/op
BenchmarkStringsBuilderString/50-2          	  200000	      8830 ns/op	     256 B/op	       5 allocs/op
BenchmarkStringsBuilderString/100-2         	  200000	      9074 ns/op	     256 B/op	       5 allocs/op
BenchmarkStringsBuilderString/200-2         	  200000	      9874 ns/op	     256 B/op	       5 allocs/op
BenchmarkStringsBuilderString/500-2         	  100000	     10186 ns/op	     256 B/op	       5 allocs/op
----
BenchmarkBytesBufferWriteString/10-2        	  200000	      9678 ns/op	     336 B/op	       3 allocs/op
BenchmarkBytesBufferWriteString/50-2        	  100000	     12116 ns/op	    1472 B/op	       5 allocs/op
BenchmarkBytesBufferWriteString/100-2       	  100000	     14234 ns/op	    2976 B/op	       6 allocs/op
BenchmarkBytesBufferWriteString/200-2       	  100000	     17745 ns/op	    5984 B/op	       7 allocs/op
BenchmarkBytesBufferWriteString/500-2       	   50000	     47359 ns/op	   13536 B/op	       8 allocs/op
BenchmarkStringsBuilderWriteString/10-2     	  200000	      9035 ns/op	     256 B/op	       5 allocs/op
BenchmarkStringsBuilderWriteString/50-2     	  100000	     11519 ns/op	    1024 B/op	       7 allocs/op
BenchmarkStringsBuilderWriteString/100-2    	  100000	     11835 ns/op	    2048 B/op	       8 allocs/op
BenchmarkStringsBuilderWriteString/200-2    	  100000	     14784 ns/op	    4096 B/op	       9 allocs/op
BenchmarkStringsBuilderWriteString/500-2    	  100000	     24236 ns/op	   15104 B/op	      12 allocs/op
---
BenchmarkGrownBytesBufferWriteString/10-2   	  200000	      9725 ns/op	     336 B/op	       3 allocs/op
BenchmarkGrownBytesBufferWriteString/50-2   	  200000	     11096 ns/op	    1424 B/op	       4 allocs/op
BenchmarkGrownBytesBufferWriteString/100-2  	  100000	     12717 ns/op	    2736 B/op	       4 allocs/op
BenchmarkGrownBytesBufferWriteString/200-2  	  100000	     14994 ns/op	    5488 B/op	       4 allocs/op
BenchmarkGrownBytesBufferWriteString/500-2  	  100000	     21042 ns/op	   13424 B/op	       4 allocs/op
BenchmarkGrownStringsBuilderWriteString/10-2         	  200000	      8950 ns/op	     192 B/op	       2 allocs/op
BenchmarkGrownStringsBuilderWriteString/50-2         	  200000	     14460 ns/op	     960 B/op	       2 allocs/op
BenchmarkGrownStringsBuilderWriteString/100-2        	  100000	     11890 ns/op	    1920 B/op	       2 allocs/op
BenchmarkGrownStringsBuilderWriteString/200-2        	  100000	     15090 ns/op	    2816 B/op	       2 allocs/op
BenchmarkGrownStringsBuilderWriteString/500-2        	  100000	     21612 ns/op	    7168 B/op	       2 allocs/op
PASS
ok  	github.com/knsh14/sample/hoge	590.626s

sample.go

package main

import (
	"bytes"
	"fmt"
	"strings"
	"testing"
)

func BenchmarkBytesBufferString(b *testing.B) {
	for _, n := range []int{10, 50, 100, 200, 500} {
		b.Run(fmt.Sprintf("%d", n), func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				b.StopTimer()
				b.StartTimer()
				var buf bytes.Buffer
				for i := 0; i < 10; i++ {
					buf.WriteString("sample\n")
				}
				for i := 0; i < 10; i++ {
					buf.WriteString("sample\n")
				}
				for i := 0; i < n; i++ {
					_ = buf.String()
				}
			}
		})
	}
}
func BenchmarkStringsBuilderString(b *testing.B) {
	for _, n := range []int{10, 50, 100, 200, 500} {
		b.Run(fmt.Sprintf("%d", n), func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				b.StopTimer()
				b.StartTimer()
				var buf strings.Builder
				for i := 0; i < 10; i++ {
					buf.WriteString("sample\n")
				}
				for i := 0; i < n; i++ {
					_ = buf.String()
				}
			}
		})
	}
}

func BenchmarkBytesBufferWriteString(b *testing.B) {
	for _, n := range []int{10, 50, 100, 200, 500} {
		b.Run(fmt.Sprintf("%d", n), func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				b.StopTimer()
				b.StartTimer()
				var buf bytes.Buffer
				for i := 0; i < n; i++ {
					buf.WriteString("sample\n")
				}
				_ = buf.String()
			}
		})
	}
}
func BenchmarkStringsBuilderWriteString(b *testing.B) {
	for _, n := range []int{10, 50, 100, 200, 500} {
		b.Run(fmt.Sprintf("%d", n), func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				b.StopTimer()
				b.StartTimer()
				var buf strings.Builder
				for i := 0; i < n; i++ {
					buf.WriteString("sample\n")
				}
				_ = buf.String()
			}
		})
	}
}

func BenchmarkGrownBytesBufferWriteString(b *testing.B) {
	for _, n := range []int{10, 50, 100, 200, 500} {
		b.Run(fmt.Sprintf("%d", n), func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				b.StopTimer()
				b.StartTimer()
				var buf bytes.Buffer
				buf.Grow(n * 6)
				for i := 0; i < n; i++ {
					buf.WriteString("sample\n")
				}
				_ = buf.String()
			}
		})
	}
}
func BenchmarkGrownStringsBuilderWriteString(b *testing.B) {
	for _, n := range []int{10, 50, 100, 200, 500} {
		b.Run(fmt.Sprintf("%d", n), func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				b.StopTimer()
				b.StartTimer()
				var buf strings.Builder
				buf.Grow(n * 6)
				for i := 0; i < n; i++ {
					buf.WriteString("sample\n")
				}
				_ = buf.String()
			}
		})
	}
}