text: # -*- coding: utf-8 -*-
  #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  """
  This dag tests performance of simple bash commands executed with Airflow.
  """
  from datetime import timedelta
  
  from airflow.models import DAG
  from airflow.operators.bash_operator import BashOperator
  from airflow.utils.dates import days_ago
  
  args = {
      'owner': 'airflow',
      'start_date': days_ago(3),
  }
  
  dag = DAG(
      dag_id='perf_dag_1', default_args=args,
      schedule_interval='@daily',
      dagrun_timeout=timedelta(minutes=60))
  
  task_1 = BashOperator(
      task_id='perf_task_1',
      bash_command='sleep 5; echo "run_id={{ run_id }} | dag_run={{ dag_run }}"',
      dag=dag)
  
  for i in range(2, 5):
      task = BashOperator(
          task_id='perf_task_{}'.format(i),
          bash_command='''
              sleep 5; echo "run_id={{ run_id }} | dag_run={{ dag_run }}"
          ''',
          dag=dag)
      task.set_upstream(task_1)
  
  if __name__ == "__main__":
      dag.cli()
  