Class: Custodian::Samplers::CPU

Inherits:
Sampler
  • Object
show all
Defined in:
lib/custodian/samplers/linux/cpu.rb,
lib/custodian/samplers/darwin/cpu.rb

Class Method Summary collapse

Methods inherited from Sampler

compatible?, describe, description

Methods included from Utilities

directory_exists?, file_exists?, program_exists?

Class Method Details

.sample ⇒ Object 



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# File 'lib/custodian/samplers/linux/cpu.rb', line 7

def self.sample
  top = `top -b -n1`.match /Cpu\(s\): +([0-9.]+)%us, +([0-9.]+)%sy, +([0-9.%]+)ni, +([0-9.]+)%id, +([0-9.]+)%wa, +([0-9.]+)%hi, +([0-9.]+)%si, +([0-9.]+)%st/

  us = top[1].to_f # User CPU time: The time the CPU has spent running users' processes that are not niced.
  sy = top[2].to_f # System CPU time: The time the CPU has spent running the kernel and its processes.
  ni = top[3].to_f # Nice CPU time: The time the CPU has spent running users' proccess that have been niced.
  id = top[4].to_f # Hardware IRQ: The amount of time the CPU has been servicing hardware interrupts.
  wa = top[5].to_f # iowait: Amount of time the CPU has been waiting for I/O to complete.
  hi = top[6].to_f # Hardware IRQ: The amount of time the CPU has been servicing hardware interrupts.
  si = top[7].to_f # Hardware Interrupts: The amount of time the CPU has been servicing software interrupts.
  st = top[8].to_f # Steal Time: The amount of CPU 'stolen' from this virtual machine by the hypervisor for other tasks.

  {
    "User"   => "#{us + ni}%",
    "System" => "#{sy + wa + hi + si + st}%",
    "Idle"   => "#{id}%"
  }
end