Contents

module Instana
  module Collector
    class GC
      attr_accessor :payload_key

      def initialize
        @payload_key = :gc
        @last_report = {}
        @this_gc = {}
        @last_major_count = 0
        @last_minor_count = 0
        ::GC::Profiler.enable
      end

      ##
      # collect
      #
      # To collect garbage collector related metrics.
      #
      def collect
        @this_gc.clear
        stats = ::GC.stat

        # Time spent in GC.  Report in milliseconds
        @this_gc[:totalTime] = ::GC::Profiler.total_time * 1000
        ::GC::Profiler.clear

        # GC metrics only available on newer Ruby versions
        if RUBY_VERSION >= '2.1'
          # GC runs.  Calculate how many have occurred since the last call
          @this_gc[:minorGcs] = stats[:minor_gc_count] - @last_minor_count
          @this_gc[:majorGcs] = stats[:major_gc_count] - @last_major_count

          # Store these counts so that we have something to compare to next
          # time around.
          @last_major_count = stats[:major_gc_count]
          @last_minor_count = stats[:minor_gc_count]
        end

        # GC Heap
        @this_gc[:heap_live] = stats[:heap_live_slot] || stats[:heap_live_slots] || stats[:heap_live_num]
        @this_gc[:heap_free] = stats[:heap_free_slot] || stats[:heap_free_slots] || stats[:heap_free_num]

        @this_gc = ::Instana::Util.enforce_deltas(@this_gc, @last_report)

        unless @this_gc.empty?
          @last_report.merge!(@this_gc)
          @this_gc
        else
          nil
        end
      rescue => e
        ::Instana.logger.error "#{__method__}:#{File.basename(__FILE__)}:#{__LINE__}: #{e.message}"
        ::Instana.logger.debug e.backtrace.join("\r\n")
      end
    end
  end
end

# Register the metrics collector if enabled
if ::Instana.config[:metrics][:gc][:enabled]
  ::Instana.collectors << ::Instana::Collector::GC.new
end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
instana-1.0.2	lib/instana/collectors/gc.rb
instana-1.0.1	lib/instana/collectors/gc.rb
instana-0.15.0	lib/instana/collectors/gc.rb
instana-0.14.2	lib/instana/collectors/gc.rb