Architecture of Computing Systems (Lecture Notes in Computer ...

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164 M.F. Dolz et al. ThemodulequeriestheSGEqueuesystem to collect information on the actual jobs, nodes and queues (qstat, qmod and qhost commands). This is then used to compel the necessary statistics, and apply the power saving policy defined by the system administrator. The module also runs several daemons implemented in Python [16]. These daemons maintain a MySQL database that contains all the information and statistics; they also query the “cluster” database used by Rocks R○ to extract information about the nodes (e.g., their MAC addresses) to remotely power them on using WakeOnLAN (WOL) [17]. The nodes of the cluster have their BIOS configured with WOL (WakeUp events). Systems that support the PCI 2.2 standard in conjunction with a compatible PCI network card usually do not require a WOL cable because energy is provided through the PCI bus. 3 Implementation of the Energy Saving Roll In this section, we describe the energy saving module in detail; see Figure 1. The module includes the following major components: – Three daemons in charge of managing the database, collecting statistics, and executing the commands that power on and shut down the nodes. – The database that stores all information necessary to make decisions. – The website interface to configure and administer users’ groups as well as set the threshold triggers that define the power saving policy. We have chosen a modular design, mapping the main functions of the system to daemons (control of queue system, collect statistics, and apply policies of activation and deactivation nodes). Moreover, we have decided to employ a database to ease data mining via SQL. The user interface is web-oriented, seamlessly integrates with Rocks R○, and facilitates remote access and administration. 3.1 Daemons Daemon for epilogue requests. A node of the cluster runs a epilogue script provided by the SGE queue system when a job completes its execution, and therefore leaves the queue. This script receives parameters from the SGE executor daemon which are essential for monitoring the cluster and, therefore, for implementing the energy saving policy. As the database is located in the frontend node, it is necessary to send this set of parameters through the network. For this purpose, the node that executes the epilogue script opens a connection via a TCP socket with the epilogue daemon that runs on the front-end node to pass the necessary information. The epilogue daemon employs this information to perform a series of updates in the energy saving module database, extracting data from the accounting file maintained by the queue system. Updated data comprise the number of jobs for the user responsible of this job, this user’s average execution time, and the queue average waiting and execution times.
EnergySaving Cluster Roll: Power Saving System for Clusters 165 �� Fig. 1. Diagram of the energy saving module �� Daemon for the queues, users and nodes. This daemon is responsible for ensuring that all information on users, nodes and queues that are actually in operation in the SGE queue system is correctly reflected by the database. To achieve this, the daemon queries the queue system about queues and nodes (with the qhost command), and the OS about users (checking the file /etc/passwd). With these data, it ensures that the database is consistent. The daemon is also in charge of enabling nodes that were marked as disabled. Daemon for the activation/deactivation actions and statistics. This daemon, the most important of the module, activates and deactivates the nodes according to the needs queue system’s user. The daemon compares the threshold parameters set by the system administrator and the current values of these parameters from the database to test if any of the activation or deactivation conditions is satisfied. If certain nodes have to be shut down, it suspends all queues to prevent the execution of new jobs, makes the transaction, updates the database and log file, and finally resumes the queues. The threshold conditions are not necessarily equal for all users, as the system administrator can create multiple user groups with different values for the threshold parameters. Thus, a priority system can be defined for groups of users. The daemon is divided into several functions, and the administrator can specify the order in which activation and deactivation conditions are checked. It is therefore very simple to enable or disable one or several of these conditions. ��
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Lecture Notes in Computer Science 5
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Volume Editors Christian Müller-Sc
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General Chair Organization Christia
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Organization IX Hartmut Schmeck Kar
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Keynote Table of Contents HyVM - Hy
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Table of Contents XIII JetBench:AnO
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How to Enhance a Superscalar Proces
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4 J. Mische et al. The Real-time Vi
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26 T.B. Preußer, P. Reichel, and R
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38 P. Bellasi, W. Fornaciari, and D
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62 B. Jakimovski, B. Meyer, and E.
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74 M. Bonn and H. Schmeck Fig. 1. J
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88 J.-P. Steghöfer et al. � �
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106 K. Kloch et al. constant. This
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242 F. Xudong et al. Speedup 14 12
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244 F. Xudong et al. 5 Related Work
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Abdullah, Tariq 174 Alima, Luc Onan
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