Method: NewRelic::Agent::SystemInfo.parse_cpuinfo

Defined in:
lib/new_relic/agent/system_info.rb

.parse_cpuinfo(cpuinfo) ⇒ Object

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# File 'lib/new_relic/agent/system_info.rb', line 123

def self.parse_cpuinfo(cpuinfo)
  # Build a hash of the form
  #   { [phys_id, core_id] => num_logical_processors_on_this_core }
  cores = Hash.new(0)
  phys_id = core_id = nil

  total_processors = 0

  cpuinfo.split("\n").map(&:strip).each do |line|
    case line
    when /^processor\s*:/
      cores[[phys_id, core_id]] += 1 if phys_id && core_id
      phys_id = core_id = nil # reset these values
      total_processors += 1
    when /^physical id\s*:(.*)/
      phys_id = $1.strip.to_i
    when /^core id\s*:(.*)/
      core_id = $1.strip.to_i
    end
  end
  cores[[phys_id, core_id]] += 1 if phys_id && core_id

  num_physical_packages = cores.keys.map(&:first).uniq.size
  num_physical_cores = cores.size
  num_logical_processors = cores.values.sum

  if num_physical_cores == 0
    num_logical_processors = total_processors

    if total_processors == 0
      # Likely a malformed file.
      num_logical_processors = nil
    end

    if total_processors == 1
      # Some older, single-core processors might not list ids,
      # so we'll just mark them all 1.
      num_physical_packages = 1
      num_physical_cores = 1
    else
      # We have no way of knowing how many packages or cores
      # we have, even though we know how many processors there are.
      num_physical_packages = nil
      num_physical_cores = nil
    end
  end

  {
    :num_physical_packages => num_physical_packages,
    :num_physical_cores => num_physical_cores,
    :num_logical_processors => num_logical_processors
  }
end