buffer-builder_test.go

package main

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

func BenchmarkBytesBufferString(b *testing.B) {
	for _, n := range []int{10, 100, 1000, 10000, 100000} {
		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 < 100; i++ {
					buf.WriteString("sample\n")
				}
				for i := 0; i < n; i++ {
					_ = buf.String()
				}
			}
		})
	}
}

func BenchmarkStringsBuilderString(b *testing.B) {
	for _, n := range []int{10, 100, 1000, 10000, 100000} {
		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 < 100; i++ {
					buf.WriteString("sample\n")
				}
				for i := 0; i < n; i++ {
					_ = buf.String()
				}
			}
		})
	}
}

func BenchmarkBytesBufferWriteString(b *testing.B) {
	for _, n := range []int{10, 100, 1000, 10000, 100000} {
		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, 100, 1000, 10000, 100000} {
		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, 100, 1000, 10000, 100000} {
		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 * 10)
				for i := 0; i < n; i++ {
					buf.WriteString("sample\n")
				}
				_ = buf.String()
			}
		})
	}
}

func BenchmarkGrownStringsBuilderWriteString(b *testing.B) {
	for _, n := range []int{10, 100, 1000, 10000, 100000} {
		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 * 10)
				for i := 0; i < n; i++ {
					buf.WriteString("sample\n")
				}
				_ = buf.String()
			}
		})
	}
}

result.txt

goos: linux
goarch: amd64
pkg: github.com/knsh14/builder-sample

BenchmarkBytesBufferString/10-2             	  100000	     14764 ns/op	    9312 B/op	      15 allocs/op
BenchmarkBytesBufferString/100-2            	   50000	     32023 ns/op	   72672 B/op	     105 allocs/op
BenchmarkBytesBufferString/1000-2           	    5000	    249965 ns/op	  706272 B/op	    1005 allocs/op
BenchmarkBytesBufferString/10000-2          	     500	   2592241 ns/op	 7042272 B/op	   10005 allocs/op
BenchmarkBytesBufferString/100000-2         	      50	  26764780 ns/op	70402272 B/op	  100005 allocs/op
BenchmarkStringsBuilderString/10-2          	  200000	     10067 ns/op	    2048 B/op	       8 allocs/op
BenchmarkStringsBuilderString/100-2         	  200000	     10249 ns/op	    2048 B/op	       8 allocs/op
BenchmarkStringsBuilderString/1000-2        	  200000	     10932 ns/op	    2048 B/op	       8 allocs/op
BenchmarkStringsBuilderString/10000-2       	  100000	     12917 ns/op	    2048 B/op	       8 allocs/op
BenchmarkStringsBuilderString/100000-2      	   20000	     60170 ns/op	    2048 B/op	       8 allocs/op

BenchmarkBytesBufferWriteString/10-2        	  200000	      7928 ns/op	     336 B/op	       3 allocs/op
BenchmarkBytesBufferWriteString/100-2       	  100000	     10232 ns/op	    2976 B/op	       6 allocs/op
BenchmarkBytesBufferWriteString/1000-2      	  100000	     23035 ns/op	   27104 B/op	       9 allocs/op
BenchmarkBytesBufferWriteString/10000-2     	   10000	    142606 ns/op	  225760 B/op	      12 allocs/op
BenchmarkBytesBufferWriteString/100000-2    	    1000	   2567386 ns/op	 3043811 B/op	      16 allocs/op
BenchmarkStringsBuilderWriteString/10-2     	  200000	      8992 ns/op	     256 B/op	       5 allocs/op
BenchmarkStringsBuilderWriteString/100-2    	  200000	      9970 ns/op	    2048 B/op	       8 allocs/op
BenchmarkStringsBuilderWriteString/1000-2   	  100000	     23022 ns/op	   29440 B/op	      14 allocs/op
BenchmarkStringsBuilderWriteString/10000-2  	   10000	    198781 ns/op	  301056 B/op	      22 allocs/op
BenchmarkStringsBuilderWriteString/100000-2 	    1000	   1877717 ns/op	 3700736 B/op	      32 allocs/op

BenchmarkGrownBytesBufferWriteString/10-2         200000              9197 ns/op             304 B/op              3 allocs/op
BenchmarkGrownBytesBufferWriteString/100-2        200000              9562 ns/op            1840 B/op              3 allocs/op
BenchmarkGrownBytesBufferWriteString/1000-2       100000             18057 ns/op           18544 B/op              3 allocs/op
BenchmarkGrownBytesBufferWriteString/10000-2               10000            127043 ns/op     180336 B/op           3 allocs/op
BenchmarkGrownBytesBufferWriteString/100000-2               2000           1133314 ns/op    1712240 B/op           3 allocs/op
BenchmarkGrownStringsBuilderWriteString/10-2              200000              6626 ns/op        112 B/op           1 allocs/op
BenchmarkGrownStringsBuilderWriteString/100-2             200000              8418 ns/op       1024 B/op           1 allocs/op
BenchmarkGrownStringsBuilderWriteString/1000-2            100000             16621 ns/op      10240 B/op           1 allocs/op
BenchmarkGrownStringsBuilderWriteString/10000-2            10000            113231 ns/op     106496 B/op           1 allocs/op
BenchmarkGrownStringsBuilderWriteString/100000-2            2000           1058665 ns/op    1007616 B/op           1 allocs/op
PASS
ok  	github.com/knsh14/builder-sample	429.809s