Mastering Cloud Computing by Rajkumar Buyya & Christian Vecchiola & S. Thamarai Selvi

Author:Rajkumar Buyya & Christian Vecchiola & S. Thamarai Selvi
Language: eng
Format: epub
ISBN: 9780124095397
Publisher: Elsevier Inc.
Published: 2013-04-07T16:00:00+00:00

All these commands can operate with parameters that are substituted with their actual values for each task instance.

Figures 7.2 and 7.3 provide examples of two possible task templates, the former as defined according to the notation used by Nimrod/G, and the latter as required by Aneka.

Figure 7.2 Nimrod/G task template definition.

Figure 7.3 Aneka parameter sweep file.

The template file has two sections: a header for the definition of the parameters, and a task definition section that includes shell commands mixed with Nimrod/G commands. The prefix node: identifies the remote location where the task is executed. Parameters are identified with the ${…} notation. The example shown remotely executes the echo command and copies to the local user directory the output of the command by saving it into a file named according to the values of the parameters x and y.

The Aneka Parameter Sweep file defines the template task for executing the BLAST application. The file is an XML document containing several sections, the most important of which are sharedFiles, parameters, and task. parameters contains the definition of the parameters that will customize the template task. Two different types of parameters are defined: a single value and a range parameter. The sharedFiles section contains the files that are required to execute the task; task specifies the operations that characterize the template task. The task has a collection of input and output files for which local and remote paths are defined, as well as a collection of commands. In the case presented, a simple execute command is shown. With respect to the previous example there is no need to explicitly move the files to the remote destination, but this operation is automatically performed by Aneka.

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