High CPU consumption in my user micro service

shahryarjb

Hello, I have a micro service that its job is manage my users, this micro service when is running and even without managing many user, or 0 user , it spends 20% cpu in developer mode, It is interesting to know, I have no error which makes me understand!! For this purpose I have no options to test my project.

How can I find this problem and fix this ?

erlang v: 20.3.1
elixir v: 1.6.4
phoenix v: 1.3.3
node v: 9.3.0
other container Redis v: 4.0.11
other container Postgresql v: 10.5

my lib in elixir project:

  defp deps do
    [
      {:postgrex, ">= 0.0.0"},
      {:ecto, "~> 2.1"},
      {:guardian, "~> 1.0"},
      {:jose, "~> 1.8"},
      {:httpoison, "~> 1.0"},
      {:plug, "~> 1.4"},
      {:comeonin, "~> 4.0"},
      {:bcrypt_elixir, "~> 1.0"},
      {:redix, "~> 0.7.0"},
      {:phoenix, "~> 1.3.0"},
      {:exq, "~> 0.10.1"},
      {:bamboo, "~> 1.1"},
      {:timex, "~> 3.4"},
      {:bamboo_smtp, "~> 1.6.0"}
    ]
  end

in phoenix project :

[
      {:phoenix, "~> 1.3.0"},
      {:phoenix_pubsub, "~> 1.0"},
      {:phoenix_ecto, "~> 3.2"},
      {:gettext, "~> 0.11"},
      {:trangell_users_service, in_umbrella: true},
      {:cowboy, "~> 1.0"},
      {:plug_cowboy, "~> 1.0"}
    ]

I am using Docker, and my project is Json base and doesn’t have Html render.

7 comments

#cpu #consumption

0 1776 7

2018-11-29 16:00:02 UTC

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NobbZ

You probably need to show some code.

Just by the dependencies you use its hard to tell.

Anyway, you should be able to use :observer or :etop to find out which processes use up your precious CPU.

Post #1

shahryarjb

Thanks, how can I load those in server, not graphical desktop, because my code has the problem in my server.

iex(2)> :observer
:observer
iex(3)> :etop
:etop

I don’t know which my code or module has the problem that I show it here :((

Post #2

NobbZ

You are running :dev env on your server?

:etop and :observer are both part of the :observer application. If you have it installed on your system a simple :observer.start() or :etop.start() should be enough.

Just remote shell into your server and use them, that usually works. This means not SSH into server and then run iex, but to use iex --name ... --cookie ... --remsh server@node to connect.

Post #3

shahryarjb

yes I was going to move it to production mode , but I saw the problem called,

Unfortunately, I didn’t understand how I can load in my server, would you mind giving me an example or explaining more?

[error] ERROR: Could not find 'wxe_driver.so' in: /usr/local/lib/erlang/lib/wx-1.8.3/priv

{:error,
 {{:load_driver, 'No driver found'},
  [
    {:wxe_server, :start, 1, [file: 'wxe_server.erl', line: 65]},
    {:wx, :new, 1, [file: 'wx.erl', line: 115]},
    {:observer_wx, :init, 1, [file: 'observer_wx.erl', line: 98]},
    {:wx_object, :init_it, 6, [file: 'wx_object.erl', line: 372]},
    {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 247]}
  ]}}

Post #4

NobbZ

For :observer you need to have wx-widgets installed. I never used it in a remote shell myself, but people told me it usually works. I can’t help you with that one.

Have you been able to figure something out using :etop?

Post #5

shahryarjb

because I was forced to load my project with iex -S mix phx.server, I restarted my container. it will take 24 hours to come 20% , I’ll update this post soon.

but now: