ashb opened a new pull request #7537: [AIRFLOW-XXXX] And script to benchmark 
scheduler dag-run time
URL: https://github.com/apache/airflow/pull/7537
 
 
   This script will run the SchedulerJob for the specified dags "to completion".
   
   That is it creates a fixed number of DAG runs for the specified DAGs (from
   the configured dag path/example dags etc), disable the scheduler from
   creating more, and then monitor them for completion. When the file task of
   the final dag run is completed the scheduler will be terminated.
   
   The aim of this script is to have a benchmark for real-world scheduler
   performance -- i.e. total time take to run N dag runs to completion.
   
   It is recommended to repeat the test at least 3 times so that you can get
   somewhat-accurate variance on the reported timing numbers.
   
   ---
   Issue link: WILL BE INSERTED BY 
[boring-cyborg](https://github.com/kaxil/boring-cyborg)
   
   Make sure to mark the boxes below before creating PR: [x]
   
   - [x] Description above provides context of the change
   - [x] Commit message/PR title starts with `[AIRFLOW-NNNN]`. AIRFLOW-NNNN = 
JIRA ID<sup>*</sup>
   - [x] Unit tests coverage for changes (not needed for documentation changes)
   - [x] Commits follow "[How to write a good git commit 
message](http://chris.beams.io/posts/git-commit/)"
   - [x] Relevant documentation is updated including usage instructions.
   - [x] I will engage committers as explained in [Contribution Workflow 
Example](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#contribution-workflow-example).
   
   <sup>*</sup> For document-only changes commit message can start with 
`[AIRFLOW-XXXX]`.
   
   ---
   In case of fundamental code change, Airflow Improvement Proposal 
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals))
 is needed.
   In case of a new dependency, check compliance with the [ASF 3rd Party 
License Policy](https://www.apache.org/legal/resolved.html#category-x).
   In case of backwards incompatible changes please leave a note in 
[UPDATING.md](https://github.com/apache/airflow/blob/master/UPDATING.md).
   Read the [Pull Request 
Guidelines](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#pull-request-guidelines)
 for more information.

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