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# encoding: utf-8
require 'one_apm/collector/sampler'
module OneApm
module Collector
module Samplers
class CpuSampler < OneApm::Collector::Sampler
attr_reader :last_time
named :cpu
def initialize
@processor_count = OneApm::Support::SystemInfo.num_logical_processors
poll
end
def set_poller poller
@poller = poller
end
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
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
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems