Changes between Initial Version and Version 1 of Old/NodeHandler/Tutorial/UnderstandingHelloWorld

Timestamp:

Sep 29, 2005, 5:22:10 PM (19 years ago)

Author:

zhibinwu

Comment:

—

Old/NodeHandler/Tutorial/UnderstandingHelloWorld

@@ +1 @@
+[wiki:WikiStart Orbit] > [wiki:NodeHandler NodeHandler] > [wiki:NodeHandler/Tutorial Tutorial] > Understanding Hello World Experiment Script
+
+= Understanding the tutorial script =
+An experiment name is used to create the corresponding database to store results and to create a unique log for the same
+{{{
+Experiment.name = "tutorial-1a"
+Experiment.project = "orbit:tutorial"
+}}}
+Create a group of nodes called ‘sender’ and assign node1-1 to it
+To the group sender, we assign a role that all nodes belonging to this group will 
+play. Here, we instruct nodehandler to assign the prototype sender to node1-1 
+Note that the ‘sender’ prototype is defined using a corresponding ‘sender.rb’ file 
+and is tied to an actual underlying application that will actual get launched on the 
+node (In this case, the application is ‘otg’ (ORBIT Traffic Generator)
+
+These are the command line arguments that will be used by nodehandler when it 
+asks the nodeagent to launch the application, for e.g, the following will 
+description will cause nodeagent to launch ‘otg –destinationHost 192.168.1.3 --
+packetsize 1024  --rate 300 -- protocol udp
+{{{
+defNodes('sender', [1,1]) {|node|                   
+node.image = nil   #Default image on the node to be used for the experiment
+node.prototype("test:proto:sender", {
+   'destinationHost' => '192.168.1.3',
+    'packetSize' => 1024,
+    'rate' => 300,
+    'protocol' => 'udp'
+  })
+node.net.w0.mode = "ad-hoc"
+}
+}}}
+Create a group of nodes called ‘receiver’ and assign node1-3 to it
+To the group receiver, we assign a role that all nodes belonging to this group will 
+play. Here, we instruct nodehandler to assign the prototype receiver to node1-3 
+Note that the ‘sender’ prototype is defined using a corresponding ‘receiver.rb’ file 
+and is tied to an actual underlying application that will actual get launched on the 
+node (In this case, the application is ‘otr’ (ORBIT Traffic Receiver)
+
+These are the command line arguments that will be used by nodehandler when it 
+asks the nodeagent to launch the application, for e.g, the following will 
+description will cause nodeagent to launch ‘otr -- hostname 192.168.1.3 –- protocol udp
+{{{
+defNodes('receiver', [1,3]) {|node|
+  node.image = nil  
+  node.prototype("test:proto:receiver" , {
+   'hostname' => '192.168.1.3',
+    'protocol' => 'udp'
+  })
+  node.net.w0.mode = "ad-hoc"
+}
+}}}
+Configures the first wireless card on all nodes to 802.11b, essid ‘helloworld’ with ip 
+addresses 192.168.x.y where x.y are the co-ordinates of the nodes
+{{{
+allNodes.net.w0 { |w|
+  w.type = 'b'
+  w.essid = "helloworld"
+  w.ip = "%192.168.%x.%y"
+}
+}}}
+Now, start the application, 
+This is a barrier where nodehandler waits to receive an OK message from each of
+the nodeagents, only proceeds when initial configurations are OK.
+{{{
+whenAllInstalled() {|node|
+}}}
+This command will request nodeagents to launch the application corresponding 
+to the role that the node is playing, e.g sender will launch the application ‘otg’ and 
+the receiver will launch the application ‘otr’ with the command line options
+as specified before
+{{{
+allNodes.startApplications
+}}}
+Conduct experiment for 60 seconds
+{{{
+  wait 60
+}}}
+End of experiment – Shut down all nodes
+{{{
+Experiment.done
+}}}