package main
import (
"fmt"
_ "net/http/pprof"
"testing"
)
// 8 Bytes/op 1 allocs/op
func BenchmarkFmt1(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
fmt.Println(100)
}
}
// 16 Bytes/op 1 allocs/op
func BenchmarkFmt2(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
fmt.Println("hello")
}
}
// 32 Bytes/op 1 allocs/op
func BenchmarkFmt3(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
fmt.Println([]int{})
}
}
// 48 Bytes/op 3 allocs/op
func BenchmarkFmt4(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
fmt.Println([]int{100})
}
}
// 64 Bytes/op 4 allocs/op
func BenchmarkFmt5(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
fmt.Println([]int{100, 200})
}
}
go version 1.7
Fmt1 : the runtime alloc 100 in heap
Fmt2: the runtime alloc a string header (addr len) in heap
Fmt3: why the runtime alloc 32 bytes for slice header ??
Fmt4: why have 3 allocs and 48 bytes ??
Fmt5: why have 4 allocs and 64 bytes ??
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