init

lib/forum/vm_memory.ex

@@ -0,0 +1,24 @@
+defmodule Forum.VmMemory do
+  @moduledoc """
+  Snapshot of BEAM VM memory categories.
+
+  These numbers come from `:erlang.memory/0`, so they describe memory held by
+  the whole VM rather than memory attributed to a particular Erlang process.
+  """
+
+  @doc """
+  Returns VM memory categories as JSON-friendly maps.
+  """
+  def list do
+    :erlang.memory()
+    |> Enum.map(fn {category, bytes} ->
+      %{
+        "category" => Atom.to_string(category),
+        "bytes" => bytes,
+        "kb" => div(bytes, 1024),
+        "mb" => Float.round(bytes / 1_048_576, 2)
+      }
+    end)
+    |> Enum.sort_by(& &1["bytes"], :desc)
+  end
+end