Detecting numbers of processors in ruby (old ugly code)

gistfile1.rb

    def YWSystemTools.number_of_processors
        if RUBY_PLATFORM =~ /linux/
            cpuinfo = IO.readlines("/proc/cpuinfo").delete_if{|x| x.index("processor")==nil}
            return cpuinfo.length
        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
    
    private
    def YWSystemTools.numberOfActiveProcessors # internal
        processorForProcs = []
        processFiles      = Dir.glob("/proc/*/stat")
        raise IOError, 'Cannot find /proc/*/stat files. Are you sure this is a linux machine?' if processFiles.empty?

        processFiles.each do |filename|
            next if  File.directory?(filename)  # because /proc/net/stat is a directory
            next if !File.exists?(filename) # may have disappeared in the meantime
            this_proc = []
            File.open(filename) {  |file| this_proc = file.gets.split.values_at(2,38) }
            processorForProcs << this_proc[1].to_i if this_proc[0]=="R"
        end
        processorsInUse = processorForProcs.uniq
        return(processorsInUse.length)
    end
    public

    def YWSystemTools.numberOfAvailableProcessors
        numberOfAttempts = 5
        $log.info("Will determine number of available processors. Wait #{numberOfAttempts.to_s} seconds.")
        #we estimate 5 times because of local fluctuations in procesor use. Keep minimum.
        estimationsOfNumberOfActiveProcessors = []
        numberOfAttempts.times do 
            estimationsOfNumberOfActiveProcessors << YWSystemTools.numberOfActiveProcessors
            sleep(1)
        end
        numberOfActiveProcessors  = estimationsOfNumberOfActiveProcessors.min
        numberOfTotalProcessors   = number_of_processors()
        
        raise IOError, '!! # active Processors > # processors' if numberOfActiveProcessors > numberOfTotalProcessors

        numberOfAvailableProcessors = numberOfTotalProcessors - numberOfActiveProcessors
        $log.info("#{numberOfAvailableProcessors} out of #{numberOfTotalProcessors} are available!")        
        return(numberOfAvailableProcessors)
    end