Class: Perfm::Middleware::GvlInstrumentation

Inherits:
Object
  • Object
show all
Defined in:
lib/perfm/middleware/gvl_instrumentation.rb

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ GvlInstrumentation

Returns a new instance of GvlInstrumentation.



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# File 'lib/perfm/middleware/gvl_instrumentation.rb', line 8

def initialize(app)
  @app = app
  @puma_max_threads = nil
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/perfm/middleware/gvl_instrumentation.rb', line 13

def call(env)
  response = nil
  before_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  before_gc_time = GC.total_time
  
  timer = GVLTiming.measure do
    response = @app.call(env)
  end
  
  total_time = Process.clock_gettime(Process::CLOCK_MONOTONIC) - before_time
  gc_time = GC.total_time - before_gc_time

  begin
    @puma_max_threads ||= get_puma_max_threads if defined?(::Puma)
    
    data = {
      gc_ms: (gc_time / 1_000_000.0).round(2),
      run_ms: (timer.cpu_duration * 1000.0).round(2),
      idle_ms: (timer.idle_duration * 1000.0).round(2),
      stall_ms: (timer.stalled_duration * 1000.0).round(2),
      io_percent: (timer.idle_duration / total_time * 100.0).round(1),
      method: env["REQUEST_METHOD"],
      controller: nil,
      action: nil,
      puma_max_threads: @puma_max_threads
    }
    
    if (controller = env["action_controller.instance"])
      data[:controller] = controller.controller_path
      data[:action] = controller.action_name
    end

    Perfm.agent.push_metrics(data)
  rescue => e
    puts "GVL metrics collection failed: #{e.message}"
  end

  response
end