Before running the full simulation
##################################

.. role:: bash(code)
  :language: bash

.. _Doing a dry run:

Doing a dry run
===============

By setting :bash:`dryrun` input argument to ``true``, the ``response-functions``
mode will initialize the response functions, skip the eventual reference forward
simulation, then force the dumps of all response functions control vector file
and YAML configuration file.

This mainly allows to count the number response functions (or number of
sampling batches of response function).

Only running the first control vector period
============================================

By setting :bash:`first_period_only` input argument to ``true``, all response
functions that the simulation window start is not :bash:`datei` will be
dismissed, resulting in **only running the first time period of each tracer in
the control vector**.

This option is meant to provide a quick estimation of the total computing time
required and test if the :bash:`spin_down` input argument value is appropriate.