Demonstrate the difference between several values and map as value

context_bench_test.go

package proxy

import (
	"context"
	"testing"
)

// Benchmark2Context-4    	 5373907	       192 ns/op
// Benchmark10Context-4   	  678060	      1493 ns/op
// Benchmark20Context-4   	  289543	      4408 ns/op
// Benchmark2KV-4         	 5133241	       217 ns/op
// Benchmark10KV-4        	 1185910	      1026 ns/op
// Benchmark20KV-4        	  502714	      2392 ns/op

func simulate(n int) {
	ctx := context.Background()
	for i := 0; i < n; i++ {
		ctx = context.WithValue(ctx, i, i)
	}
	for i := 0; i < n; i++ {
		_ = ctx.Value(i)
	}
}

func simulateKV(n int) {
	ctx := context.Background()
	kv := make(map[int]int)
	for i := 0; i < n; i++ {
		kv[i] = i
	}
	ctx = context.WithValue(ctx, "kv", kv)

	for i := 0; i < n; i++ {
		_ = ctx.Value("kv").(map[int]int)[i]
	}
}

func Benchmark2Context(b *testing.B) {
	for i := 0; i < b.N; i++ {
		simulate(2)
	}
}

func Benchmark10Context(b *testing.B) {
	for i := 0; i < b.N; i++ {
		simulate(10)
	}
}

func Benchmark20Context(b *testing.B) {
	for i := 0; i < b.N; i++ {
		simulate(20)
	}
}

func Benchmark2KV(b *testing.B) {
	for i := 0; i < b.N; i++ {
		simulateKV(2)
	}
}

func Benchmark10KV(b *testing.B) {
	for i := 0; i < b.N; i++ {
		simulateKV(10)
	}
}

func Benchmark20KV(b *testing.B) {
	for i := 0; i < b.N; i++ {
		simulateKV(20)
	}
}