Changes between Version 3 and Version 4 of OverSimChurn

Timestamp:

Sep 19, 2008, 1:26:22 PM (17 years ago)

Author:

Ingmar Baumgart

Comment:

--

OverSimChurn

@@ -1 +1 @@
 == OverSim and Churn ==
-OverSim uses churn generators for simulating non-static networks. The different churn generators simulate different user behaviour and can be configured individually. Note: all churn generators use an "init phase" where nodes will be added to the network until targetOverlayTerminalNum is reached: On average every "initialMobilityDelay" seconds, one node will be added; measurements will start after all nodes have joined the network.
+OverSim uses churn generators for simulating non-static networks. The different churn generators simulate different user behaviour and can be configured individually. Note: all churn generators use an "init phase" where nodes will be added to the network until targetOverlayTerminalNum is reached: On average every "**.initPhaseCreationInterval" seconds, one node will be added; measurements will start after all nodes have joined the network.
 
 === Churn Generators ===
-* '''!NoChurn''' (will be added in the next release)
+* '''!NoChurn'''
    * Node behaviour: No churn. Nodes will be added until targetOverlayTerminalNum is reached; after that, the network will remain static.
    * Parameters: None
-* '''!RandomChurn'''
-   * Node behaviour: In fixed intervalls a random number is drawn. Depending on this number, a random node is either added, deleted or migrated.
-   * Parameters: 
-       * targetMobilityDelay: Timespan in seconds between two actions.
-       * creationProbability, migrationProbability, removalProbability: Changes the probability of the actions taken when a number is drawn. Example: ''creationProbability=0.5, removalProbability=0.5, migrationProbability=0''. In this case, every ''targetMobilityDelay'' seconds a node is added or  removed with a probability of 50%. Other example: ''creationProbability=0.6, removalProbability=0.4, migrationProbability=0''. In this example, nodes are created with a probability of 60% and removed with a probability of 40%. This will result in a constantly growing network.
-   * Parameter restriction: The sum of all probabilities must not exeed 1.
-   * Notes: This churn generator can be used to simulate static networks if all probabilities are set to 0.
 * '''!LifetimeChurn'''
    * Node behaviour: On creation of a node, his lifetime will be drawn randomly from a given probability function. When this time is reached, the node is removed. A new node will be created after a ''dead time'' drawn from the same probability function.
@@ -24 +17 @@
       * deadtimeMean: The mean deadtime.
    * Notes: This churn generator results in heavy tailed session times similar to empirical results from P2P filesharing networks or MMOGs.
+* '''!RandomChurn'''
+   * Node behaviour: In fixed intervalls a random number is drawn. Depending on this number, a random node is either added, deleted or migrated.
+   * Parameters: 
+       * targetMobilityDelay: Timespan in seconds between two actions.
+       * creationProbability, migrationProbability, removalProbability: Changes the probability of the actions taken when a number is drawn. Example: ''creationProbability=0.5, removalProbability=0.5, migrationProbability=0''. In this case, every ''targetMobilityDelay'' seconds a node is added or  removed with a probability of 50%. Other example: ''creationProbability=0.6, removalProbability=0.4, migrationProbability=0''. In this example, nodes are created with a probability of 60% and removed with a probability of 40%. This will result in a constantly growing network.
+   * Parameter restriction: The sum of all probabilities must not exeed 1.
 
 === Using multiple churn generators ===
@@ -32 +31 @@
 
 {{{
-**.churnGeneratorTypes = "RandomChurn LifetimeChurn"
+**.churnGeneratorTypes = "NoChurn LifetimeChurn"
 **[0].overlayType = "OverlayPubSubLobby"
 **[0].tier1Type = "TierDummy"
-**[0].initialMobilityDelay=1
-**[0].creationProbability=0.0
-**[0].migrationProbability=0.0
-**[0].removalProbability=0.0
 **[0].targetOverlayTerminalNum=1
 **[1].overlayType = "OverlayPubSubMMOG"
@@ -46 +41 @@
 }}}
 
-Here "!RandomChurn" and "!LifetimeChurn" are used. Random churn creates one single node (''**![0].targetOverlayTerminalNum=1'') that will remain static (''**![0].creationProbability=0.0 **![0].migrationProbability=0.0 **![0].removalProbability=0''). This node will use the "!OverlayPubSubLobby" overlay module. The other nodes will be managend by !LifetimeChurn. There will be an average of 10 these nodes (''**![1].targetOverlayTerminalNum=10''). They will stay for average 1000 seconds (''**.![1].lifetimeMean=1000'') and use "OverlayPubSubMMOG" as overlay module, and "!SimpleGameClientModules" as tier 1 application.
+Here "!NoChurn" and "!LifetimeChurn" are used. NoChurn creates one single static node (''**![0].targetOverlayTerminalNum=1''). This node will use the "!OverlayPubSubLobby" overlay module. The other nodes will be managend by !LifetimeChurn. There will be an average of 10 these nodes (''**![1].targetOverlayTerminalNum=10''). They will stay for average 1000 seconds (''**.![1].lifetimeMean=1000'') and use "OverlayPubSubMMOG" as overlay module, and "!SimpleGameClientModules" as tier 1 application.