Ruby on Rails

I am developing Rails application(ruby2.1.5 and rails4.2.0) for embedded
device.I have observed that every time when I run Rails Application,CPU
utilization spikes to 100% for few seconds on startup

My system info is as follows:


   root@wandboard-quad:~/test3# uname -a
    Linux wandboard-quad 3.0.35-4.0.0-wandboard+gd35902c #1 SMP PREEMPT
Wed Aug 6 12:42:22 IST 2014 armv7l GNU/Linux


I have followed following steps:

1. Created new application with following command:

rails new test3

Started rails server

rails server

I have got following cpu utillization on startup


 1569 root      20   0 10392 6960 2472 R     29  0.4   0:00.88 ruby
 **1579 root      20   0 25404  19m 3448 R     97  1.1   0:03.04 ruby
 1579 root      20   0 44416  35m 4196 R    100  1.9   0:06.04 ruby**
 1579 root      20   0 61084  51m 4460 S     76  2.8   0:08.32 ruby
 1579 root      20   0 62148  52m 4516 S      5  2.9   0:08.47 ruby
 1579 root      20   0 62148  52m 4516 S      0  2.9   0:08.48 ruby
 1579 root      20   0 62148  52m 4516 S      0  2.9   0:08.49 ruby
 1579 root      20   0 62148  52m 4516 S      0  2.9   0:08.50 ruby
After digging further using BYEBUG ,I think cpu spikes in
commands_tasks.rb file in method server at following line


require APP_PATH

what might be reason for CPU going high on startup?
I have tried this various webservers like Webbrick,thin,unicorn.

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