Class: Barnes::Instruments::RubyGC

Inherits:
Object
  • Object
show all
Defined in:
lib/barnes/instruments/ruby_gc.rb

Constant Summary collapse

COUNTERS = 
{
:count => :'GC.count',
:major_gc_count => :'GC.major_count',
:minor_gc_count => :'GC.minor_gc_count' }
GAUGE_COUNTERS = 
{}

Instance Method Summary collapse

Constructor Details

#initialize(sample_rate) ⇒ RubyGC

Returns a new instance of RubyGC.



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# File 'lib/barnes/instruments/ruby_gc.rb', line 53

def initialize(sample_rate)
  # see header for an explanation of how this sample_rate is used
  @sample_rate = sample_rate
end

Instance Method Details

#instrument!(state, counters, gauges) ⇒ Object 



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# File 'lib/barnes/instruments/ruby_gc.rb', line 62

def instrument!(state, counters, gauges)
  last = state[:ruby_gc]
  cur = state[:ruby_gc] = GC.stat

  COUNTERS.each do |stat, metric|
    counters[metric] = cur[stat] - last[stat] if cur.include? stat
  end

  # special treatment gauges
  GAUGE_COUNTERS.each do |stat, metric|
    if cur.include? stat
      val = cur[stat] - last[stat] if cur.include? stat
      gauges[metric] = val * (1/@sample_rate)
    end
  end

  # the rest of the gauges
  cur.each do |k, v|
    unless GAUGE_COUNTERS.include? k
      gauges[:"GC.#{k}"] = v
    end
  end
end

#start!(state) ⇒ Object 



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# File 'lib/barnes/instruments/ruby_gc.rb', line 58

def start!(state)
  state[:ruby_gc] = GC.stat
end