How to use the simgrid.Engine.get_clock function in simgrid

def __call__(self):
        workload = 100E6
        host = this_actor.get_host()

        nb = host.get_pstate_count()
        this_actor.info("Count of Processor states={:d}".format(nb))

        this_actor.info("Current power peak={:f}".format(host.speed))

        # Run a task
        this_actor.execute(workload)

        task_time = Engine.get_clock()
        this_actor.info("Task1 duration: {:.2f}".format(task_time))

        # Change power peak
        new_pstate = 2

        this_actor.info("Changing power peak value to {:f} (at index {:d})".format( host.get_pstate_speed(new_pstate), new_pstate))

        host.pstate = new_pstate

        this_actor.info("Current power peak={:f}".format(host.speed))

        # Run a second task
        this_actor.execute(workload)

        task_time = Engine.get_clock() - task_time
        this_actor.info("Task2 duration: {:.2f}".format(task_time))

task_time = Engine.get_clock()
        this_actor.info("Task1 duration: {:.2f}".format(task_time))

        # Change power peak
        new_pstate = 2

        this_actor.info("Changing power peak value to {:f} (at index {:d})".format( host.get_pstate_speed(new_pstate), new_pstate))

        host.pstate = new_pstate

        this_actor.info("Current power peak={:f}".format(host.speed))

        # Run a second task
        this_actor.execute(workload)

        task_time = Engine.get_clock() - task_time
        this_actor.info("Task2 duration: {:.2f}".format(task_time))

        # Verify that the default pstate is set to 0
        host2 = Host.by_name("MyHost2")
        this_actor.info("Count of Processor states={:d}".format(host2.get_pstate_count()))

        this_actor.info("Current power peak={:f}".format(host2.speed))

this_actor.info("Goodbye now!")


if __name__ == '__main__':
    e = Engine(sys.argv)
    if len(sys.argv) < 2:
        raise AssertionError(
            "Usage: actor-join.py platform_file [other parameters]")

    e.load_platform(sys.argv[1])

    Actor.create("master", Host.by_name("Tremblay"), master)

    e.run()

    this_actor.info("Simulation time {}".format(Engine.get_clock()))