Changes between Version 30 and Version 31 of Tutorials/a0Basic/Tutorial2


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Timestamp:
Feb 12, 2013, 5:45:57 PM (12 years ago)
Author:
digitalphen
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Corrected broken links

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  • Tutorials/a0Basic/Tutorial2

    v30 v31  
    66== 1. Developing a Script for an Experiment ==
    77
    8 As explained in the previous [wiki:NodeHandler/Tutorial/Testbed overview] page, to run an experiment on the testbed a user needs to first describe the experiment in a ''script''. This ''script'' is then passed on to a '''Node Handler''', which will use it to run and control the experiment execution. This process is illustrated in figure 1.
     8As explained in the previous [wiki:NodeHandler/Testbed overview] page, to run an experiment on the testbed a user needs to first describe the experiment in a ''script''. This ''script'' is then passed on to a '''Node Handler''', which will use it to run and control the experiment execution. This process is illustrated in figure 1.
    99
    1010This script contains the experiment configuration and scenario.  More precisely, it includes:
    … …  
    2222== 2. "Hello World" experiment ==
    2323
    24 In this basic experiment, we define two groups of node: a ''sender'' and a ''receiver'' group. Although a group of node can contain several nodes, in this simple case each group contains only one node. We also associate a traffic generator application to the ''sender'' group, and a traffic sink application to the ''receiver'' group. We then define the configuration of the wireless interfaces on the nodes within these groups. Finally, we describe the successive actions to execute in order to perform the experiment.
     24In this basic experiment, we define two groups of nodes: a ''sender'' group and a ''receiver'' group. Although a group of nodes can contain several nodes, in this simple case each group contains only one node. We also associate a traffic generator application to the ''sender'' group, and a traffic sink application to the ''receiver'' group. We then define the configuration of the wireless interfaces on the nodes within these groups. Finally, we describe the successive actions to execute in order to perform the experiment.
    2525
    2626The script for this experiment is shown below.
    … …  
    5757
    5858#
    59 # C)  Configure the wireless interfaces of All the Nodes involved in
     59# C)  Configure the wireless interfaces of all the nodes involved in
    6060#     this experiment
    6161#
    … …  
    8686== 3. Understanding the "Hello World" script ==
    8787
    88 As you noticed the "Hello World" script is almost ''human-readable'', and is quite understandable to any computer-literate reader. As already mentioned above, deep Ruby knowledge is '''not''' a prerequisite to running experiment on the ORBIT testbed.
    89 
    90  * The first part of this script uses the ORBIT method ''defGroup'' to define a group of nodes called ''sender'', which contains a unique node ''[1,1]''. Next, we perform some specific configurations on the node(s) within the group ''sender''. These specific configurations are described in a ''block'' (e.g. curly braces) that directly follows the ''defGroup'' call. Within this ''block'', we first assign a particular application to the ''sender'' node(s). This application is a traffic generator and is accessed via a ''prototype'' which is called ''test:proto:sender'' in this example. A prototype can be viewed as a wrapper around an existing application. It defines some set of properties (i.e. "parameters"), which allows us to customize the wrapped application for the specific need of an experiment. For example in this case, through the prototype we can set the address of the sender, and various parameters of the traffic generator itself, such as packet size, rate, and the protocol over which to send the traffic. Prototypes are normally defined in separate files, and the ORBIT platform has a set of predefined prototypes for some basic applications. For example, the prototype "test:proto:sender" is a wrapper around the application "otg" (orbit traffic generator). Other tutorials (see [wiki:Tutorial main page]) describes how to write your own prototypes for your own or existing applications. The last line on this 'sender' block configures the first wireless interface ''w0'' on the node(s) in this block into ''managed'' mode.
     88As you noticed the "Hello World" script is almost ''human-readable'', and is quite understandable to any computer-literate reader. As already mentioned above, deep Ruby knowledge is '''not''' a prerequisite to running experiments on the ORBIT testbed.
     89
     90 * The first part of this script uses the ORBIT method ''defGroup'' to define a group of nodes called ''sender'', which contains a unique node ''[1,1]''. Next, we perform some specific configurations on the node(s) within the group ''sender''. These specific configurations are described in a ''block'' (e.g. curly braces) that directly follows the ''defGroup'' call. Within this ''block'', we first assign a particular application to the ''sender'' node(s). This application is a traffic generator and is accessed via a ''prototype'' which is called ''test:proto:sender'' in this example. A prototype can be viewed as a wrapper around an existing application. It defines some set of properties (i.e. "parameters"), which allows us to customize the wrapped application for the specific need of an experiment. For example in this case, through the prototype we can set the address of the sender, and various parameters of the traffic generator itself, such as packet size, rate, and the protocol over which to send the traffic. Prototypes are normally defined in separate files, and the ORBIT platform has a set of predefined prototypes for some basic applications. For example, the prototype "test:proto:sender" is a wrapper around the application "otg" (orbit traffic generator). Other tutorials (see [wiki:Tutorials main page]) describe how to write your own prototypes for your own or existing applications. The last line on this ''sender'' block configures the first wireless interface ''w0'' on the node(s) in this block into ''managed'' mode.
    9191
    9292{{{
    … …  
    168168}}}
    169169
    170  * You can find detailed description of all the various experiment-specific scripting commands (such as ''defGroup'', ''allGroups'', ''whenAllInstalled'', etc...) in the '''Node Handler''' document page '''[wiki:Documentation/NodeHandler here]'''
     170 * You can find detailed description of all the various experiment-specific scripting commands (such as ''defGroup'', ''allGroups'', ''whenAllInstalled'', etc...) in the '''Node Handler''' document page '''[wiki:Old/NodeHandler/Commands/defNodes here]'''
    171171
    172172[[BR]]
    … …  
    209209 }}}
    210210
    211  * Install a disk image which includes ''nodeAgent4'' on the nodes of this testbed. For example, you can use the latest ''baseline.ndz'' disk image. This disk image installation is done using the ''omf load'' command above. Detailed instructions on how to perform such disk image installation on the nodes on a testbed can be found [wiki:Tutorial/HowToImage here].
     211 * Install a disk image which includes ''nodeAgent4'' on the nodes of this testbed. For example, you can use the latest ''baseline.ndz'' disk image. This disk image installation is done using the ''omf load'' command above. Detailed instructions on how to perform such disk image installation on the nodes on a testbed can be found [wiki:Tutorials/HowToImage here].
    212212
    213213
    … …  
    248248}}}
    249249
    250 '''Congratulation''' you just ran your first experiment script on the Orbit Testbed!
    251 
    252 You will find information on how to collect and interpret measurements and results from your experiment in the next parts of this basic tutorial, [wiki:Tutorial/CollectMeasurements here] and [wiki:Tutorial/AnalyzeResults here]
     250'''Congratulations''' you just ran your first experiment script on the Orbit Testbed!
     251
     252You will find information on how to collect and interpret measurements and results from your experiment in the next parts of this basic tutorial, [wiki:Tutorials/CollectMeasurements here] and [wiki:Tutorials/AnalyzeResults here]
    253253
    254254[[BR]]
    … …  
    265265=== 5.2. More Tutorials ===
    266266
    267 Once you are done with the remaining parts of this basic tutorial (i.e. [wiki:Tutorial/CollectMeasurements collecting] and [wiki:Tutorial/AnalyzeResults interpreting] experiment measurements and results), you might want to have a look at the other tutorials on the [wiki:Tutorial main page] to further learn about the other ORBIT functions that can help you develop your own complex experiments.
     267Once you are done with the remaining parts of this basic tutorial (i.e. [wiki:Tutorials/CollectMeasurements collecting] and [wiki:Tutorials/AnalyzeResults interpreting] experiment measurements and results), you might want to have a look at the other tutorials on the [wiki:Tutorials main page] to further learn about the other ORBIT functions that can help you develop your own complex experiments.
    268268
    269269=== 5.3. Definitions of the Prototypes and Application used in the "Hello World" script ===