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