you can see, this article is a must read. It's a pity that it's not
freely available, though.
-.. _howto_calibration:
-
-Getting realistic results
-*************************
-
-The simulation models in SimGrid have been developed with care and the
-object of thorough validation/invalidation campaigns. These models
-come with parameters that configure their behaviors. The values of
-these parameters are set based on the :ref:`XML platform description
-file <platform>` and on parameters passed via :ref:`--cfg=Item:Value
-command-line arguments <options>`. A simulator may also include any
-number of custom model parameters that are used to instantiate
-particular simulated activities (e.g., a simulator developed with the
-S4U API typically defines volumes of computation, communication, and
-time to pass to methods such as :cpp:func:`execute()
-<simgrid::s4u::this_actor::execute>`, :cpp:func:`put()
-<simgrid::s4u::Mailbox::put>`, or :cpp:func:`sleep_for()
-<simgrid::s4u::this_actor::sleep_for>`). Regardless of the potential
-accuracy of the simulation models, if they are instantiated with
-unrealistic parameter values, then the simulation will be inaccurate.
-The provided default values may or may not be appropriate for
-simulating a particular system.
-
-Given the above, an integral and crucial part of simulation-driven
-research is **simulation calibration**: the process by which one picks
-simulation parameter values based on observed real-world executions so
-that simulated executions have high accuracy. We then say that a
-simulator is "calibrated". Once a simulator is calibrated for a
-real-world system, it can be used to simulate that system accurately.
-But it can also be used to simulate different but structurally
-similar systems (e.g., different scales, different basic hardware
-characteristics, different application workloads) with high confidence.
-
-Research conclusions derived from simulation results obtained with an
-uncalibrated simulator are questionable in terms of their relevance
-for real-world systems. Unfortunately, because simulation calibration
-is often a painstaking process, is it often not performed sufficiently
-thoroughly (or at all!). We strongly urge SimGrid users to perform
-simulation calibration. Here is an example of a research publication
-in which the authors have calibrated their (SimGrid) simulators:
-https://hal.inria.fr/hal-01523608
-
-
.. _howto_churn:
Modeling churn (e.g., in P2P)
<link_ctn id="link2"/>
</route>
-.. include:: tuto_disk/analysis.irst
-
-.. include:: tuto_network_calibration/network_calibration_tutorial.rst
