NDLI: On the validity of flow-level tcp network models for grid and cloud simulations

Content Provider	ACM Digital Library
Author	Velho, Pedro Casanova, Henri Legrand, Arnaud Schnorr, Lucas Mello
Copyright Year	2013
Abstract	Researchers in the area of grid/cloud computing perform many of their experiments using simulations that must capture network behavior. In this context, $\textit{packet-level}$ simulations, which are widely used to study network protocols, are too costly given the typical large scales of simulated systems and applications. An alternative is to implement network simulations with less costly $\textit{flow-level}$ models. Several flow-level models have been proposed and implemented in grid/cloud simulators. Surprisingly, published validations of these models, if any, consist of verifications for only a few simple cases. Consequently, even when they have been used to obtain published results, the ability of these simulators to produce scientifically meaningful results is in doubt. This work evaluates these state-of-the-art flow-level network models of TCP communication via comparison to packet-level simulation. While it is straightforward to show cases in which previously proposed models lead to good results, instead we follow the critical method, which places model refutation at the center of the scientific activity, and we systematically seek cases that lead to invalid results. Careful analysis of these cases reveals fundamental flaws and also suggests improvements. One contribution of this work is that these improvements lead to a new model that, while far from being perfect, improves upon all previously proposed models in the context of simulation of grids or clouds. A more important contribution, perhaps, is provided by the pitfalls and unexpected behaviors encountered in this work, leading to a number of enlightening lessons. In particular, this work shows that model validation cannot be achieved solely by exhibiting (possibly many) “good cases.” Confidence in the quality of a model can only be strengthened through an invalidation approach that attempts to prove the model wrong.
Starting Page	1
Ending Page	26
Page Count	26
File Format	PDF
ISSN	10493301
e-ISSN	15581195
DOI	10.1145/2517448
Volume Number	23
Issue Number	4
Journal	ACM Transactions on Modeling and Computer Simulation (TOMACS)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-12-16
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Grid and cloud computing simulation SimGrid Scalability Validation
Content Type	Text
Resource Type	Article
Subject	Computer Science Applications Modeling and Simulation

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On the Validity of Flow-level TCP Network Models for Grid and Cloud Simulations

On the validity of flow-level TCP network models for grid and cloud simulations (2013)

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