检测安装的 CPU 数量 [英] Detect number of CPUs installed

问题描述

我已经通过 cat/proc/cpuinfo 找到了大多数 unixes"的解决方案，但纯 Ruby 解决方案会更好.

I already found a solution for "Most unixes" via cat /proc/cpuinfo, but a pure-Ruby solution would be nicer.

推荐答案

我目前正在使用这个，它涵盖了所有 os.https://github.com/grosser/parallel/blob/master/lib/parallel.rb#L63

I am currently using this, which covers all os. https://github.com/grosser/parallel/blob/master/lib/parallel.rb#L63

  def self.processor_count
    case RbConfig::CONFIG['host_os']
    when /darwin9/
      `hwprefs cpu_count`.to_i
    when /darwin/
      ((`which hwprefs` != '') ? `hwprefs thread_count` : `sysctl -n hw.ncpu`).to_i
    when /linux/
      `cat /proc/cpuinfo | grep processor | wc -l`.to_i
    when /freebsd/
      `sysctl -n hw.ncpu`.to_i
    when /mswin|mingw/
      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
    end
  end

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