Module: Kernel

Defined in:
lib/parallelpipes.rb

Instance Method Summary collapse

Instance Method Details

#number_of_processors_for_parallel_map ⇒ Object

Returns the number of processor for Linux, OS X or Windows.



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# File 'lib/parallelpipes.rb', line 2337

def number_of_processors_for_parallel_map
  if RUBY_PLATFORM =~ /linux/
    return `cat /proc/cpuinfo | grep processor | wc -l`.to_i
  elsif RUBY_PLATFORM =~ /darwin/
    return `sysctl -n hw.logicalcpu`.to_i
  elsif RUBY_PLATFORM =~ /win32/
    # this works for windows 2000 or greater
    require 'win32ole'
    wmi = WIN32OLE.connect("winmgmts://")
    wmi.ExecQuery("select * from Win32_ComputerSystem").each do |system| 
      begin
        processors = system.NumberOfLogicalProcessors
      rescue
        processors = 0
      end
      return [system.NumberOfProcessors, processors].max
    end
  end
  raise "can't determine 'number_of_processors' for '#{RUBY_PLATFORM}'"
end