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New Relic's Open-Source Elixir Agent
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lib/new_relic/sampler/beam.ex
defmodule NewRelic.Sampler.Beam do
use GenServer
@kb 1024
@mb 1024 * 1024
# Takes samples of the state of the BEAM at an interval
@moduledoc false
def start_link(_) do
GenServer.start_link(__MODULE__, :ok, name: __MODULE__)
end
def init(:ok) do
:erlang.system_flag(:scheduler_wall_time, true)
# throw away first value
:cpu_sup.util()
:erlang.statistics(:scheduler_wall_time)
NewRelic.sample_process()
if NewRelic.Config.enabled?(),
do: Process.send_after(self(), :report, NewRelic.Sampler.Reporter.random_sample_offset())
{:ok, %{previous: take_sample()}}
end
def handle_info(:report, state) do
current_sample = record_sample(state)
Process.send_after(self(), :report, NewRelic.Sampler.Reporter.sample_cycle())
{:noreply, %{state | previous: current_sample}}
end
def handle_call(:report, _from, state) do
current_sample = record_sample(state)
{:reply, :ok, %{state | previous: current_sample}}
end
def record_sample(state) do
{current_sample, stats} = collect(state.previous)
NewRelic.report_sample(:BeamStat, stats)
NewRelic.report_metric(:memory, mb: stats[:memory_total_mb])
NewRelic.report_metric(:cpu, utilization: stats[:cpu_utilization])
current_sample
end
defp collect(previous) do
current_sample = take_sample()
stats = Map.merge(current_sample, delta(previous, current_sample))
{current_sample, stats}
end
defp take_sample do
{gcs, _, _} = :erlang.statistics(:garbage_collection)
{reductions, _} = :erlang.statistics(:reductions)
{{:input, bytes_in}, {:output, bytes_out}} = :erlang.statistics(:io)
memory = :erlang.memory()
%{
garbage_collections: gcs,
input_kb: bytes_in / @kb,
output_kb: bytes_out / @kb,
reductions: reductions,
run_queue: :erlang.statistics(:total_run_queue_lengths),
memory_total_mb: memory[:total] / @mb,
memory_procs_mb: memory[:processes_used] / @mb,
memory_ets_mb: memory[:ets] / @mb,
memory_atom_mb: memory[:atom_used] / @mb,
memory_binary_mb: memory[:binary] / @mb,
memory_code_mb: memory[:code] / @mb,
atom_count: :erlang.system_info(:atom_count),
ets_count: :erlang.system_info(:ets_count),
port_count: :erlang.system_info(:port_count),
process_count: :erlang.system_info(:process_count),
atom_limit: :erlang.system_info(:atom_limit),
ets_limit: :erlang.system_info(:ets_limit),
port_limit: :erlang.system_info(:port_limit),
process_limit: :erlang.system_info(:process_limit),
schedulers: :erlang.system_info(:schedulers),
scheduler_utilization: :erlang.statistics(:scheduler_wall_time) |> Enum.sort(),
cpu_count: :erlang.system_info(:logical_processors),
cpu_utilization: :cpu_sup.util()
}
end
defp delta(previous, current) do
%{
garbage_collections: current.garbage_collections - previous.garbage_collections,
input_kb: current.input_kb - previous.input_kb,
output_kb: current.output_kb - previous.output_kb,
reductions: current.reductions - previous.reductions,
scheduler_utilization:
delta(:util, previous.scheduler_utilization, current.scheduler_utilization)
}
end
defp delta(:util, previous, current) do
{active, total} =
Enum.zip(previous, current)
|> Enum.map(fn {{n, a0, t0}, {n, a1, t1}} -> {n, a1 - a0, t1 - t0} end)
|> Enum.reduce({0, 0}, fn {_n, d_a, d_t}, {acc_a, acc_t} -> {acc_a + d_a, acc_t + d_t} end)
safe_div(active, total)
end
defp safe_div(_, 0.0), do: 0.0
defp safe_div(a, b), do: a / b
end