Process.info/1 可以讓我們看到 process 當下的詳細狀態

info = Process.info(self())

會得到相當很長超級詳細的 keyword list

[
  current_function: {Process, :info, 1},
  initial_call: {:proc_lib, :init_p, 5},
  status: :running,
  message_queue_len: 0,
  links: [],
  dictionary: [
    {{:elixir, :eval_env},
     #Macro.Env<
       aliases: [],
       context: nil,
       context_modules: [],
       file: "iex",
# ... 中略    
      kill: true,
      size: 0
    },
    min_bin_vheap_size: 46422,
    min_heap_size: 233,
    fullsweep_after: 65535,
    minor_gcs: 23
  ],
  suspending: []
]

我們也可以使用 Process.info/2 可以只拿取需要的欄位

iex(4)> Process.info(self(), :current_function)
{:current_function, {Process, :info, 2}}

或是多個 key

iex(5)> Process.info(self(), [:current_function, :initial_call])
[current_function: {Process, :info, 2}, initial_call: {:proc_lib, :init_p, 5}]

提供了各種方面的資訊，從目前執行的函式 :current_function, 狀態 :status, 遞迴數 :reductions 以及監督類的 :monitors, :parent

iex(7)> Process.info(self(), :current_function)
{:current_function, {Process, :info, 2}}

iex(8)> Process.info(self(), :status)
{:status, :running}

iex(9)> Process.info(self(), :heap_size)
{:heap_size, 6772}

iex(10)> Process.info(self(), :stack_size)
{:stack_size, 59}

iex(11)> Process.info(self(), :reductions)
{:reductions, 121195}

iex(13)> Process.info(self(), :monitors)
{:monitors, []}

iex(14)> Process.info(self(), :parent)
{:parent, #PID<0.98.0>}