https://dave.cheney.net/2021/01/05/a-few-bytes-here-a-few-there-pretty-soon-youre-talking-real-memory

sortalloc_test.go

// go test -bench=. sortalloc_test.go

package main

import (
    "sort"
    "testing"
)

func BenchmarkSortStrings(b *testing.B) {
    s := []string{"heart", "lungs", "brain", "kidneys", "pancreas"}
    b.ReportAllocs()
    for i := 0; i < b.N; i++ {
        sort.Strings(s)
    }
}