From fdd8fa53a0a19b2c8796d3f507ccff0749ba80f6 Mon Sep 17 00:00:00 2001
From: Ian Luites <IanLuites@users.noreply.github.com>
Date: Fri, 17 Mar 2017 18:18:53 +0000
Subject: [PATCH] Fix issue #18.

---
 lib/wobserver/system/scheduler.ex | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/wobserver/system/scheduler.ex b/lib/wobserver/system/scheduler.ex
index 12a2753..59c9b41 100644
--- a/lib/wobserver/system/scheduler.ex
+++ b/lib/wobserver/system/scheduler.ex
@@ -34,14 +34,17 @@ defmodule Wobserver.System.Scheduler do
     case last_utilization() do
       false ->
         get_utilization()
-        |> Enum.map(fn {_, u, t} -> u / t end)
+        |> Enum.map(fn {_, u, t} -> percentage(u, t) end)
       last ->
         get_utilization()
         |> Enum.zip(last)
-        |> Enum.map(fn {{_, u0, t0}, {_, u1, t1}} -> (u1 - u0) / (t1 - t0) end)
+        |> Enum.map(fn {{_, u0, t0}, {_, u1, t1}} -> percentage((u1 - u0), (t1 - t0)) end)
     end
   end
 
+  defp percentage(_, 0), do: 0
+  defp percentage(u, t), do: u / t
+
   defp get_utilization do
     util =
       :scheduler_wall_time