josevalim

defmodule FibAgent do 
  def start_link do
    cache = Enum.into([{0, 0}, {1, 1}], HashDict.new)
    Agent.start_link(fn -> cache end)
  end
 
  def fib(pid, n) when n >= 0 do
    Agent.get_and_update(pid, &do_fib(&1, n))
  end
 

josevalim

defmodule Exq.RouterPlug do
  import Plug.Conn
  use Plug.Router

  plug :match
  plug :dispatch

  get "/queues" do
    IO.puts "YOLO"
    conn |> halt()

josevalim

defmodule SomeModule do
  def start(host, options) do
    # We are assuming SomeSup has been already started somewhere
    # (ideally in a supervision tree).
    {:ok, child_pid} = SomeSup.attach_to(SomeSup, host, options)
  end
end

defmodule SomeSup do
  use Supervisor

josevalim

Comparative Benchmark Numbers @ Rackspace

I've taken the benchmarks from Matthew Rothenberg's phoenix-showdown, updated Phoenix to 0.13.1 and ran the tests on the most powerful machines available at Rackspace.

Results

Framework	Throughput (req/s)	Latency (ms)	Consistency (σ ms)

josevalim

defmodule Api.Authorize do
  alias Account.Models.User

  def board?(board_id, %User{} = user, available_permissions, required_permissions) do
    with(
      {:ok, board} <- Tracker.Board.find(board_id),
      true <- Tracker.OrganizationMembers.user_in_organization?(user.id, board.organization_id),
      ^required_permissions <-
        Enum.to_list(
          MapSet.intersection(