Class: Instana::Collector::GC

Inherits:
Object
  • Object
show all
Defined in:
lib/instana/collectors/gc.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ GC

Returns a new instance of GC.



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# File 'lib/instana/collectors/gc.rb', line 6

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

Instance Attribute Details

#payload_key ⇒ Object

Returns the value of attribute payload_key.



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# File 'lib/instana/collectors/gc.rb', line 4

def payload_key
  @payload_key
end

Instance Method Details

#collect ⇒ Object

collect

To collect garbage collector related metrics.



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# File 'lib/instana/collectors/gc.rb', line 20

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