From: Guillaume Ebuprofen <guillaume.dorchies@...>
Date: 2010-10-22T21:58:26+09:00
Subject: Strange consumption CPU for a quite small program

Hello,

Below my little program for Linux (because I use ps command)

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
require 'socket'

Thread.abort_on_exception=true

pid=Process.fork do
  ##Processus 1
  thread=Thread.new do
    tcp_server = TCPServer.new('0.0.0.0',10000)
    socket = tcp_server.accept
  end
  thread.join
end

#Porcessus 2
while true
  output=''
  IO.popen("ps -p #{pid} -o pcpu,size") do |pipe|
    output=pipe.read
  end
  puts output
  sleep(1)
end
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

When I execute this program (with ruby 1.8.7 or 1.9.2) and after 10
steps, I can see process 1 consumes CPU, why ?

Best regards

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