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New Relic's Open-Source Elixir Agent
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lib/new_relic/os_mon.ex
defmodule NewRelic.OsMon do
def start() do
Application.ensure_all_started(:os_mon)
:persistent_term.put(__MODULE__, true)
end
@mb 1024 * 1024
def get_system_memory() do
when_enabled(fn ->
case :memsup.get_system_memory_data()[:system_total_memory] do
nil -> nil
bytes -> trunc(bytes / @mb)
end
end)
end
def util() do
when_enabled(fn ->
case :cpu_sup.util() do
{:error, _} -> nil
0 -> nil
val -> val
end
end)
end
defp when_enabled(fun, default \\ nil) do
case :persistent_term.get(__MODULE__, false) do
true -> fun.()
false -> default
end
end
end