Checks if all iterations have completed.

        TODO(rliaw): also check that `t.iterations == self._r`

def cur_iter_done(self):
        """Checks if all iterations have completed.

        TODO(rliaw): also check that `t.iterations == self._r`"""
        return all(
            self._get_result_time(result) >= self._cumul_r
            for result in self._live_trials.values())