mix-run.exs

➜ env MIX_ENV=prod iex -S mix run --preload-modules
Erlang/OTP 21 [erts-10.3.2] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [hipe] [dtrace]

Interactive Elixir (1.8.1) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> :erlang.memory
[
  total: 51579624,
  processes: 11315424,
  processes_used: 11145888,
  system: 40264200,
  atom: 1033401,
  atom_used: 1007174,
  binary: 360208,
  code: 23053955,
  ets: 2000568
]
iex(2)> Application.ensure_all_started :sasl
{:ok, [:sasl]}
iex(3)> :erlang.memory
[
  total: 51642368,
  processes: 11180944,
  processes_used: 11116208,
  system: 40461424,
  atom: 1033401,
  atom_used: 1010402,
  binary: 420712,
  code: 23156267,
  ets: 2005552
]

release.exs

➜ _build/prod/rel/hello/bin/hello console
Erlang/OTP 21 [erts-10.3.2] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [hipe] [dtrace]

Interactive Elixir (1.8.1) - press Ctrl+C to exit (type h() ENTER for help)
iex(hello@127.0.0.1)1> :erlang.memory
[
  total: 56843616,
  processes: 18718480,
  processes_used: 18584296,
  system: 38125136,
  atom: 992433,
  atom_used: 971447,
  binary: 223352,
  code: 21443760,
  ets: 2011728
]