Minor optimisations to Elixir/Phoenix implementation (TechEmpower#3848)

* Completely disable as much logging as we can
* Remove unneccessary middlewares
* Switch to a different, faster, json encoder

frameworks/Elixir/phoenix/config/prod.exs

@@ -15,7 +15,13 @@ config :hello, Hello.Repo,
  password: "benchmarkdbpass",
  database: "hello_world",
  hostname: "tfb-database",
- pool_size: 256
+ pool_size: 256,
+ loggers: []
+
+ config :logger,
+ compile_time_purge_level: :error,
+ level: :error,
+ backends: []
 
 # ## SSL Support
 #
@@ -30,5 +36,3 @@ config :hello, Hello.Repo,
 #
 # Where those two env variables point to a file on
 # disk for the key and cert.
-
-config :logger, level: :error

frameworks/Elixir/phoenix/lib/hello/endpoint.ex

@@ -1,33 +1,10 @@
 defmodule Hello.Endpoint do
  use Phoenix.Endpoint, otp_app: :hello
 
- # Serve at "/" the given assets from "priv/static" directory
- plug Plug.Static,
- at: "/", from: :hello, gzip: false,
- only: ~w(css images js favicon.ico robots.txt)
-
- # Code reloading will only work if the :code_reloader key of
- # the :phoenix application is set to true in your config file.
- if code_reloading? do
- socket "/phoenix/live_reload/socket", Phoenix.LiveReloader.Socket
- plug Phoenix.LiveReloader
- plug Phoenix.CodeReloader
- end
-
- plug Plug.Logger
-
  plug Plug.Parsers,
- parsers: [:urlencoded, :multipart, :json],
+ parsers: [:json, :urlencoded, :multipart],
  pass: ["*/*"],
- json_decoder: Poison
-
- plug Plug.MethodOverride
- plug Plug.Head
-
- plug Plug.Session,
- store: :cookie,
- key: "_hello_key",
- signing_salt: "DNlAnJ2o"
+ json_decoder: Jason
 
  plug Hello.Router
 end

frameworks/Elixir/phoenix/mix.exs

@@ -16,8 +16,7 @@ defmodule Hello.Mixfile do
  #
  # Type `mix help compile.app` for more information
  def application do
- [mod: {Hello, []},
- applications: [:phoenix, :phoenix_ecto, :postgrex, :cowboy, :logger, :phoenix_html]]
+ [mod: {Hello, []}, extra_applications: [:logger]]
  end
 
  defp elixirc_paths(_), do: ["lib", "web"]
@@ -30,6 +29,7 @@ defmodule Hello.Mixfile do
  {:phoenix_ecto, "~> 3.3"},
  {:postgrex, ">= 0.0.0"},
  {:cowboy, "~> 1.0"},
+ {:jason, "~> 1.0"},
  {:phoenix_html, "~> 2.11"},
  {:phoenix_live_reload, "~> 1.1", only: :dev}]
  end

frameworks/Elixir/phoenix/web/controllers/page_controller.ex

@@ -6,20 +6,20 @@ defmodule Hello.PageController do
  def index(conn, _params) do
  conn
  |> put_resp_content_type("application/json", nil)
- |> send_resp(200, Poison.encode!(%{"TE Benchmarks\n" => "Started"}))
+ |> send_resp(200, Jason.encode_to_iodata!(%{"TE Benchmarks\n" => "Started"}))
  end
 
  # avoid namespace collision
  def _json(conn, _params) do
  conn
  |> put_resp_content_type("application/json", nil)
- |> send_resp(200, Poison.encode!(%{message: "Hello, world!"}))
+ |> send_resp(200, Jason.encode_to_iodata!(%{"message" => "Hello, world!"}))
  end
 
  def db(conn, _params) do
  conn
  |> put_resp_content_type("application/json", nil)
- |> send_resp(200, Poison.encode!(Repo.get(World, :rand.uniform(10000))))
+ |> send_resp(200, Jason.encode_to_iodata!(Repo.get(World, :rand.uniform(10000))))
  end
 
  def queries(conn, params) do
@@ -35,7 +35,7 @@ defmodule Hello.PageController do
 
  conn
  |> put_resp_content_type("application/json", nil)
- |> send_resp(200, Poison.encode!(Enum.map(1..q, fn _ -> Repo.get(World, :rand.uniform(10000)) end)))
+ |> send_resp(200, Jason.encode_to_iodata!(for _ <- 1..q, do: Repo.get(World, :rand.uniform(10000))))
  end
 
  def fortunes(conn, _params) do
@@ -60,16 +60,17 @@ defmodule Hello.PageController do
  ArgumentError -> 1
  end
 
- conn
- |> put_resp_content_type("application/json", nil)
- |> send_resp(200, Poison.encode!(Enum.map(1..q, fn _ ->
+ data = for _ <- 1..q do
  id = :rand.uniform(10000)
  num = :rand.uniform(10000)
  w = Repo.get(World, id)
- changeset = World.changeset(w, %{randomnumber: num})
- Repo.update(changeset)
- %{id: id, randomnumber: num}
- end)))
+ changeset = Ecto.Changeset.change(w, randomnumber: num)
+ Repo.update!(changeset)
+ end
+
+ conn
+ |> put_resp_content_type("application/json", nil)
+ |> send_resp(200, Jason.encode_to_iodata!(data))
  end
 
  def plaintext(conn, _params) do

frameworks/Elixir/phoenix/web/models/fortune.ex

@@ -1,16 +1,8 @@
 defmodule Hello.Fortune do
  use Hello.Web, :model
 
- @derive {Poison.Encoder, only: [:id, :message]}
+ @derive {Jason.Encoder, only: [:id, :message]}
  schema "fortune" do
  field :message, :string
  end
-
- @required_fields ~w(message)a
- @optional_fields ~w()
-
- def changeset(model, params \\ %{}) do
- model
- |> cast(params, @required_fields)
- end
 end

frameworks/Elixir/phoenix/web/models/world.ex

@@ -1,16 +1,8 @@
 defmodule Hello.World do
  use Hello.Web, :model
 
- @derive {Poison.Encoder, only: [:id, :randomnumber]}
+ @derive {Jason.Encoder, only: [:id, :randomnumber]}
  schema "world" do
  field :randomnumber, :integer
  end
-
- @required_fields ~w(randomnumber)a
- @optional_fields ~w()
-
- def changeset(model, params \\ %{}) do
- model
- |> cast(params, @required_fields)
- end
 end

frameworks/Elixir/phoenix/web/web.ex

@@ -24,7 +24,7 @@ defmodule Hello.Web do
 
  def controller do
  quote do
- use Phoenix.Controller
+ use Phoenix.Controller, log: false
 
  # Alias the data repository and import query/model functions
  alias Hello.Repo