class OneApm::Collector::Samplers::CpuSampler

Attributes

last_time[R]

Public Class Methods

new() click to toggle source
# File lib/one_apm/collector/samplers/cpu_sampler.rb, line 13
def initialize
  @processor_count = OneApm::Support::SystemInfo.num_logical_processors
  poll
end
supported_on_this_platform?() click to toggle source
# 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

Public Instance Methods

poll() click to toggle source
# 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) click to toggle source
# File lib/one_apm/collector/samplers/cpu_sampler.rb, line 18
def set_poller poller
  @poller = poller
end