cpu_counter.rb

module Rake

# Based on a script at:
  #   http://stackoverflow.com/questions/891537/ruby-detect-number-of-cpus-installed
  class CpuCounter # :nodoc: all
    def self.count
      new.count_with_default
    end

def count_with_default(default=4)
      count || default
    rescue StandardError
      default
    end

begin
      require "etc"
    rescue LoadError
    else
      if Etc.respond_to?(:nprocessors)
        def count
          return Etc.nprocessors
        end
      end
    end
  end
end

unless Rake::CpuCounter.method_defined?(:count)
  Rake::CpuCounter.class_eval <<-'end;', __FILE__, __LINE__+1
    require 'rbconfig'

def count
      if defined?(Java::Java)
        count_via_java_runtime
      else
        case RbConfig::CONFIG['host_os']
        when /linux/
          count_via_cpuinfo
        when /darwin|bsd/
          count_via_sysctl
        when /mswin|mingw/
          count_via_win32
        else
          # Try everything
          count_via_win32 ||
          count_via_sysctl ||
          count_via_cpuinfo
        end
      end
    end

def count_via_java_runtime
      Java::Java.lang.Runtime.getRuntime.availableProcessors
    rescue StandardError
      nil
    end

def count_via_win32
      require 'win32ole'
      wmi = WIN32OLE.connect("winmgmts://")
      cpu = wmi.ExecQuery("select NumberOfCores from Win32_Processor") # TODO count hyper-threaded in this
      cpu.to_enum.first.NumberOfCores
    rescue StandardError, LoadError
      nil
    end

def count_via_cpuinfo
      open('/proc/cpuinfo') { |f| f.readlines }.grep(/processor/).size
    rescue StandardError
      nil
    end

def count_via_sysctl
      run 'sysctl', '-n', 'hw.ncpu'
    end

def run(command, *args)
      cmd = resolve_command(command)
      if cmd
        IO.popen [cmd, *args] do |io|
          io.read.to_i
        end
      else
        nil
      end
    end

def resolve_command(command)
      look_for_command("/usr/sbin", command) ||
        look_for_command("/sbin", command) ||
        in_path_command(command)
    end

def look_for_command(dir, command)
      path = File.join(dir, command)
      File.exist?(path) ? path : nil
    end

def in_path_command(command)
      IO.popen ['which', command] do |io|
        io.eof? ? nil : command
      end
    end
  end;
end

docroot: /home/induvedam/public_html

curdir: /opt/alt/ruby24/lib64/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake

	.	4096
	..	33
X	application.rb	23628
X	backtrace.rb	866
X	clean.rb	2046
X	cloneable.rb	418
X	cpu_counter.rb	2348
X	default_loader.rb	235
X	dsl_definition.rb	5580
X	early_time.rb	340
	ext	38
X	file_creation_task.rb	670
X	file_list.rb	12708
X	file_task.rb	1290
X	file_utils.rb	3824
X	file_utils_ext.rb	4149
X	invocation_chain.rb	1184
X	invocation_exception_mixin.rb	431
X	late_time.rb	265
X	linked_list.rb	2806
	loaders	25
X	multi_task.rb	1526
X	name_space.rb	672
X	packagetask.rb	5673
X	phony.rb	351
X	private_reader.rb	364
X	promise.rb	2307
X	pseudo_status.rb	375
X	rake_module.rb	770
X	rake_test_loader.rb	340
X	rule_recursion_overflow_error.rb	352
X	scope.rb	869
X	task.rb	11652
X	task_argument_error.rb	119
X	task_arguments.rb	2438
X	task_manager.rb	8938
X	tasklib.rb	135
X	testtask.rb	6088
X	thread_history_display.rb	1126
X	thread_pool.rb	4753
X	trace_output.rb	545
X	version.rb	178
X	win32.rb	1522