Class: OneApm::Collector::Samplers::CpuSampler

Inherits:
OneApm::Collector::Sampler show all
Defined in:
lib/one_apm/collector/samplers/cpu_sampler.rb

Instance Attribute Summary collapse

Attributes inherited from OneApm::Collector::Sampler

#id

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from OneApm::Collector::Sampler

enabled?, inherited, name, named, sampler_classes

Constructor Details

#initialize ⇒ CpuSampler

Returns a new instance of CpuSampler.



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# File 'lib/one_apm/collector/samplers/cpu_sampler.rb', line 13

def initialize
  @processor_count = OneApm::Support::SystemInfo.num_logical_processors
  poll
end

Instance Attribute Details

#last_time ⇒ Object (readonly)

Returns the value of attribute last_time.



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# File 'lib/one_apm/collector/samplers/cpu_sampler.rb', line 9

def last_time
  @last_time
end

Class Method Details

.supported_on_this_platform? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/one_apm/collector/samplers/cpu_sampler.rb', line 49

def self.supported_on_this_platform?
  # Process.times on JRuby < 1.7.0 reports wall clock elapsed time, not actual cpu time used
  defined?(JRuby) ? (JRUBY_VERSION >= '1.7.0') : true
end

Instance Method Details

#poll ⇒ Object 



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# File 'lib/one_apm/collector/samplers/cpu_sampler.rb', line 22

def poll
  now = Time.now
  @poller.pid = Process.pid if @poller
  t = Process.times

  if @last_time
    elapsed = now - @last_time
    return if elapsed < 1 # Causing some kind of math underflow

    usertime = t.utime - @last_utime
    systemtime = t.stime - @last_stime

    if systemtime >= 0
      OneApm::Manager.record_metric("CPU/System Time", systemtime)
      OneApm::Manager.record_metric("CPU/System/Utilization", systemtime / (elapsed * @processor_count))
    end
    if usertime >= 0
      cpu_utilization = @poller ? @poller.cpu_utilization : (usertime / (elapsed * @processor_count))
      OneApm::Manager.record_metric("CPU/User Time", usertime)
      OneApm::Manager.record_metric("CPU/User/Utilization", cpu_utilization)
    end
  end
  @last_utime = t.utime
  @last_stime = t.stime
  @last_time = now
end

#set_poller(poller) ⇒ Object 



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# File 'lib/one_apm/collector/samplers/cpu_sampler.rb', line 18

def set_poller poller
  @poller = poller
end