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parroty
152 Stars 11 Forks MIT License 76 Commits 1 Opened issues

Description

A simple code profiler for Elixir using eprof.

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ExProf

Build Status hex.pm version hex.pm downloads

A simple code profiler for Elixir using eprof.

It provides a simple macro as a wrapper for Erlang's :eprof profiler.

Install

Add

:exprof
to
deps
section of
mix.exs
.
  def deps do
    [ {:exprof, "~> 0.2.0"} ]
  end

Usage

import "ExProf.Macro", then use "profile" macro to start profiling. It prints out results, and returns them as list of records, along with the result of the profiled block.

defmodule SampleRunner do
  import ExProf.Macro

@doc "analyze with profile macro" def do_analyze do profile do :timer.sleep 2000 IO.puts "message\n" end end

@doc "get analysis records and sum them up" def run do {records, _block_result} = do_analyze total_percent = Enum.reduce(records, 0.0, &(&1.percent + &2)) IO.inspect "total = #{total_percent}" end end

Run

An example to use in iex console.

$ iex -S mix
..
iex(1)> SampleRunner.run
message

FUNCTION CALLS % TIME [uS / CALLS] -------- ----- --- ---- [----------] 'Elixir.IO':puts/2 1 0.86 1 [ 1.00] io:o_request/3 1 1.72 2 [ 2.00] io:put_chars/2 1 1.72 2 [ 2.00] erlang:group_leader/0 1 1.72 2 [ 2.00] io:request/2 1 2.59 3 [ 3.00] io:execute_request/2 1 2.59 3 [ 3.00] 'Elixir.SampleRunner':'-run/0-fun-0-'/0 1 2.59 3 [ 3.00] 'Elixir.IO':map_dev/1 1 3.45 4 [ 4.00] erlang:demonitor/2 1 4.31 5 [ 5.00] io:io_request/2 1 6.03 7 [ 7.00] io:wait_io_mon_reply/2 1 6.90 8 [ 8.00] 'Elixir.IO':puts/1 1 8.62 10 [ 10.00] unicode:characters_to_binary/2 1 11.21 13 [ 13.00] timer:sleep/1 1 14.66 17 [ 17.00] erlang:monitor/2 1 31.03 36 [ 36.00] "total = 100.0"

Add a Mix Task

An example to use as mix tasks.

defmodule Mix.Tasks.Exprof do
  @shortdoc "Profile using ExProf"
  use Mix.Task
  import ExProf.Macro

def run(_mix_args) do profile do: do_work(2) end

defp do_work(n) do :timer.sleep(n * 1000) end end

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