murbanski

# spec/controllers/api_clients_controller_spec.rb
RSpec.describe APIClientsController, type: :controller do
  let(:api_client) { mock_model(APIClient) }

  context "when HTTP Digest auth credentials are invalid" do
    before do
      authenticate_with_http_digest("invalid_login", "invalid_password") do
        get :index
      end
    end

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs