substack-allocate-huge-objects.go

// The maximum size of explicitly
// declared variables on stacks is 10MB
type T struct {
    X [10 * 1000 * 1000]byte // 10MB
}

var global interface{}

func BenchmarkAllocOnHeap(b *testing.B) {
    b.ReportAllocs()
    for i := 0; i <= b.N; i++ {
        global = &T{}
    }
}

func BenchmarkAllocOnStack(b *testing.B) {
    b.ReportAllocs()
    for i := 0; i <= b.N; i++ {
        local := T{}
        _ = local
    }
}