package allocate
import "testing"
import "os"
import "fmt"
func init() {
fmt.Println("OS page size:", os.Getpagesize())
}
var r1 []byte
func BenchmarkCount1(b *testing.B) {
for i := 0; i < b.N; i++ {
r1 = make([]byte, 32768+1)
}
}
var r2 []byte
func BenchmarkCount2(b *testing.B) {
for i := 0; i < b.N; i++ {
r2 = make([]byte, 40)
}
}
The output:
OS page size: 32768
BenchmarkCount1-4 166443 7312 ns/op 40960 B/op
1 allocs/op
BenchmarkCount2-4 31465389 36.88 ns/op 48 B/op
1 allocs/op
In fact, a memory block with size 36864 is enough to carry the elements of
a byte slice with size 32768+1. Why to allocate one more page for them?
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