Changeset 683 for papers/SMPaT-2012_DCWoRMS/elsarticle-DCWoRMS.tex

Timestamp:

11/30/12 11:31:10 (12 years ago)

Author:

wojtekp

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• papers/SMPaT-2012_DCWoRMS/elsarticle-DCWoRMS.tex (modified) (5 diffs)

papers/SMPaT-2012_DCWoRMS/elsarticle-DCWoRMS.tex

@@ -262 +262 @@
 In general, power profiles allow specifying the power usage of resources. Depending on the accuracy of the model, users may provide additional information about power states which are supported by the resources, amounts of energy consumed in these states, and other information essential to calculate the total energy consumed by the resource during runtime. In such a way each component of IT infrastructure may be described, including computing resources, system components and data center facilities. Moreover, it is possible to define any number of new, resource specific, states, for example so called P-states, in which processor can operate.
 
-\paragraph{\textbf{Energy consumption model}}
+\paragraph{\textbf{Power consumption model}}
 The main aim of these models is to emulate the behavior of the real computing resource and the way it consumes energy. Due to a rich functionality and flexible environment description, DCWoRMS can be used to verify a number of theoretical assumptions and to develop new energy consumption models. Modeling of energy consumption is realized by the energy estimation plugin that calculates energy usage based on information about the resource power profile, resource utilization, and the application profile including energy consumption and heat production metrics. Relation between model and power profile is illustrated in Figure~\ref{fig:powerModel}.
 
@@ -268 +268 @@
 \centering
 \includegraphics[width = 8cm]{fig/powerModel.png}
-\caption{\label{fig:powerModel} Energy consumption modeling}
+\caption{\label{fig:powerModel} Power consumption modeling}
 \end{figure}
 
@@ -281 +281 @@
 
 \paragraph{\textbf{Air throughput profile}}
-The air throughput profile, analogously to the power profile, allows specifying supported air flow states. Each air throughput state definition consists of an air flow value and a corresponding power draw. It can represent, for instance, a fan working state. An air throughput value can also express a fan rotation speed. In this way, associating the air throughput profile with the given computing resource, it is possible to describe mounted air-cooling devices.
+The air throughput profile, analogously to the power profile, allows specifying supported air flow states. Each air throughput state definition consists of an air flow value and a corresponding power draw. It can represent, for instance, a fan working state. In this way, associating the air throughput profile with the given computing resource, it is possible to describe mounted air-cooling devices.
 Possibility of introducing additional parameters makes the air throughput description extensible for new specific characteristics.
 
@@ -306 +306 @@
 
 \paragraph{\textbf{Temperature estimation model}}
-Thermal profile, complemented with the temperature measurement model implementation may introduce temperature sensors simulation. In this way, users have means to approximately predict the temperature of the simulated objects. The proposed approach assumes some simplifications that ignore heating and cooling processes.
+Thermal profile, complemented with the temperature measurement model implementation may introduce temperature sensors simulation. In this way, users have means to approximately predict the temperature of the simulated objects by taking into account basic thermal characteristics as well as the estimated impact of cooling devices. However, the proposed approach assumes some simplifications that ignore heating and cooling dynamics understood as a heat flow process.
 
 Figure~\ref{fig:tempModel} summarizes relation between model and profile and input data.
@@ -420 +420 @@
 \textbf{Static} model refers to a static definition of air throughput states. According to this approach, output air flow depends only on the present air cooling working state and the corresponding air throughput value. Each state change triggers the calculations and updates the current air throughput value. This strategy requires only a basic air throughput profile definition.
 
-\textbf{Space} model allows taking into account a duct associated with the investigated air flow. On the basis of the given fan rotation speed and the obstacles before/behind the fans, the output air throughput can be roughly estimated, Thus, it is possible to estimate the air flow level not only referring to the current fan operating state but also with respect to the resource and its subcomponent placement. More advanced scenario may consider mutual impact of several air flows.
+\textbf{Space} model allows taking into account a duct associated with the investigated air flow. On the basis of the given fan rotation speed and the obstacles before/behind the fans, the output air throughput can be roughly estimated. To this end, additional manufacturer's specifications will be required, including resulting air velocity values and fan duct dimensions. Thus, it is possible to estimate the air flow level not only referring to the current fan operating state but also with respect to the resource and its subcomponent placement. More advanced scenario may consider mutual impact of several air flows.
 
 \subsection{Thermal models}\label{sec:thermal}