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require 'new_relic/agent/sampler'
module NewRelic
module Agent
module Samplers
class CpuSampler < NewRelic::Agent::Sampler
attr_reader :last_time
def initialize
super :cpu
poll
end
def user_util_stats
stats_engine.get_stats_no_scope("CPU/User/Utilization")
end
def system_util_stats
stats_engine.get_stats_no_scope("CPU/System/Utilization")
end
def usertime_stats
stats_engine.get_stats_no_scope("CPU/User Time")
end
def systemtime_stats
stats_engine.get_stats_no_scope("CPU/System Time")
end
def self.supported_on_this_platform?
# Process.times on JRuby reports wall clock elapsed time,
# not actual cpu time used, so we cannot use this sampler there.
not defined?(JRuby)
end
def poll
now = Time.now
t = Process.times
if @last_time
elapsed = now - @last_time
return if elapsed < 1 # Causing some kind of math underflow
num_processors = NewRelic::Control.instance.local_env.processors || 1
usertime = t.utime - @last_utime
systemtime = t.stime - @last_stime
systemtime_stats.record_data_point(systemtime) if systemtime >= 0
usertime_stats.record_data_point(usertime) if usertime >= 0
# Calculate the true utilization by taking cpu times and dividing by
# elapsed time X num_processors.
user_util_stats.record_data_point usertime / (elapsed * num_processors)
system_util_stats.record_data_point systemtime / (elapsed * num_processors)
end
@last_utime = t.utime
@last_stime = t.stime
@last_time = now
end
end
end
end
end
Version data entries
105 entries across 105 versions & 5 rubygems