Class: Flamegraph::Sampler

Inherits:
Object
  • Object
show all
Defined in:
lib/flamegraph/sampler.rb

Class Method Summary collapse

Class Method Details

.collect(fidelity = 0.5) ⇒ Object 



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# File 'lib/flamegraph/sampler.rb', line 2

def self.collect(fidelity=0.5)
  backtraces = []
  done = false

  t = Thread.current
  thread = Thread.new do
    until done
      backtraces << t.backtrace_locations

      # On my machine using Ruby 2.0 this give me excellent fidelity of stack trace per 1.2ms
      #   with this fidelity analysis becomes very powerful
      sleep (fidelity / 1000.0)
    end
  end

  begin
    yield
  ensure
    done = true
    thread.join
  end

  backtraces
end