Benchmark access to context.Context.Value VS method call

context_test.go

package benchmark_context_value

import (
	"context"
	"testing"
)

type contextKey struct{}

var ctxKey contextKey

type foo struct {
	val string
}

func (f *foo) value() string {
	return f.val
}

func BenchmarkContextValue(b *testing.B) {
	ctx := context.WithValue(b.Context(), ctxKey, "value")

	for b.Loop() {
		ctx.Value(ctxKey)
	}
}

func BenchmarkFunctionCall(b *testing.B) {
	f := &foo{"value"}

	for b.Loop() {
		f.value()
	}
}