Class: NewRelic::Agent::Threading::ThreadProfile

Inherits:
Object
  • Object
show all
Includes:
Coerce
Defined in:
lib/new_relic/agent/threading/thread_profile.rb

Constant Summary collapse

THREAD_PROFILER_NODES = 
20_000

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Coerce

#float, #int, #log_failure, #string

Constructor Details

#initialize(agent_command) ⇒ ThreadProfile

Returns a new instance of ThreadProfile.



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 24

def initialize(agent_command)
  arguments = agent_command.arguments
  @profile_id = arguments.fetch('profile_id', -1)
  @profile_agent_code = arguments.fetch('profile_agent_code', true)

  @duration = arguments.fetch('duration', 120)
  @worker_loop = NewRelic::Agent::WorkerLoop.new(:duration => duration)
  @interval = arguments.fetch('sample_period', 0.1)
  @finished = false

  @traces = {
    :agent => [],
    :background => [],
    :other => [],
    :request => []
  }
  @flattened_nodes = []

  @poll_count = 0
  @sample_count = 0
  @failure_count = 0
end

Instance Attribute Details

#duration ⇒ Object (readonly)

Returns the value of attribute duration.



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 17

def duration
  @duration
end

#interval ⇒ Object (readonly)

Returns the value of attribute interval.



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 17

def interval
  @interval
end

#poll_count ⇒ Object (readonly)

Returns the value of attribute poll_count.



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 17

def poll_count
  @poll_count
end

#profile_agent_code ⇒ Object (readonly)

Returns the value of attribute profile_agent_code.



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 17

def profile_agent_code
  @profile_agent_code
end

#profile_id ⇒ Object (readonly)

Returns the value of attribute profile_id.



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 17

def profile_id
  @profile_id
end

#sample_count ⇒ Object (readonly)

Returns the value of attribute sample_count.



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 17

def sample_count
  @sample_count
end

#start_time ⇒ Object (readonly)

Returns the value of attribute start_time.



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 17

def start_time
  @start_time
end

#stop_time ⇒ Object (readonly)

Returns the value of attribute stop_time.



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 17

def stop_time
  @stop_time
end

#traces ⇒ Object (readonly)

Returns the value of attribute traces.



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 17

def traces
  @traces
end

Class Method Details

.parse_backtrace(trace) ⇒ Object 



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 162

def self.parse_backtrace(trace)
  trace.map do |line|
    line =~ /(.*)\:(\d+)\:in `(.*)'/
      { :method => $3, :line_no => $2.to_i, :file => $1 }
  end
end

Instance Method Details

#aggregate(trace, trees = , parent = nil) ⇒ Object 



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 86

def aggregate(trace, trees=@traces[:request], parent=nil)
  return nil if trace.nil? || trace.empty?
  node = Threading::BacktraceNode.new(trace.last)
  existing = trees.find {|n| n == node}

  if existing.nil?
    existing = node
    @flattened_nodes << node
  end

  if parent
    parent.add_child(node)
  else
    trees << node unless trees.include? node
  end

  existing.runnable_count += 1
  aggregate(trace[0..-2], existing.children, existing)

  existing
end

#finished? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 148

def finished?
  @finished
end

#mark_done ⇒ Object 



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 152

def mark_done
  @finished = true
  @stop_time = now_in_millis
end

#mark_for_pruning(nodes, count_to_keep) ⇒ Object 



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 157

def mark_for_pruning(nodes, count_to_keep)
  to_prune = nodes[count_to_keep..-1] || []
  to_prune.each { |n| n.to_prune = true }
end

#now_in_millis ⇒ Object 



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 144

def now_in_millis
  Time.now.to_f * 1_000
end

#prune!(count_to_keep) ⇒ Object 



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 108

def prune!(count_to_keep)
  @flattened_nodes.sort!(&:order_for_pruning)

  NewRelic::Agent.instance.stats_engine.
    record_supportability_metric_count("ThreadProfiler/NodeCount", @flattened_nodes.size)

  mark_for_pruning(@flattened_nodes, count_to_keep)

  traces.each { |_, nodes| Threading::BacktraceNode.prune!(nodes) }
end

#run ⇒ Object 



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 47

def run
  NewRelic::Agent.logger.debug("Starting thread profile. profile_id=#{profile_id}, duration=#{duration}")

  Threading::AgentThread.new('Thread Profiler') do
    @start_time = now_in_millis

    @worker_loop.run(@interval) do
      NewRelic::Agent.instance.stats_engine.
        record_supportability_metric_timed("ThreadProfiler/PollingTime") do

        @poll_count += 1
        Threading::AgentThread.list.each do |t|
          bucket = Threading::AgentThread.bucket_thread(t, @profile_agent_code)
          if bucket != :ignore
            backtrace = Threading::AgentThread.scrub_backtrace(t, @profile_agent_code)
            if backtrace.nil?
              @failure_count += 1
            else
              @sample_count += 1
              aggregate(backtrace, @traces[bucket])
            end
          end
        end
        end
    end

    mark_done
    NewRelic::Agent.logger.debug("Finished thread profile. #{@sample_count} backtraces, #{@failure_count} failures. Will send with next harvest.")
    NewRelic::Agent.instance.stats_engine.
      record_supportability_metric_count("ThreadProfiler/BacktraceFailures", @failure_count)
  end
end

#stop ⇒ Object 



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 80

def stop
  @worker_loop.stop
  mark_done
  NewRelic::Agent.logger.debug("Stopping thread profile.")
end

#to_collector_array(encoder) ⇒ Object 



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# File 'lib/new_relic/agent/threading/thread_profile.rb', line 123

def to_collector_array(encoder)
  prune!(THREAD_PROFILER_NODES)

  traces = {
    "OTHER" => @traces[:other].map{|t| t.to_array },
    "REQUEST" => @traces[:request].map{|t| t.to_array },
    "AGENT" => @traces[:agent].map{|t| t.to_array },
    "BACKGROUND" => @traces[:background].map{|t| t.to_array }
  }

  [[
    int(@profile_id),
    float(@start_time),
    float(@stop_time),
    int(@poll_count),
    string(encoder.encode(traces)),
    int(@sample_count),
    0
  ]]
end