Difference between revisions of "NetAnim"
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* NetAnim 2.0:
* NetAnim 2.0:
Revision as of 14:12, 1 March 2012
NetAnim is an animator based on the multi-platform Qt 4 toolkit. NetAnim currently animates the simulation using an XML trace file collected during simulation. The first version of NetAnim was developed by George F Riley.
- 1 Feature-set in NetAnim 3.0
- 2 Prerequisites
- 3 Downloading NetAnim
- 4 Building NetAnim
- 5 Using NetAnim
- 5.1 Using ns3::AnimationInterface to generate Animation trace files
- 5.2 Using the XML trace with NetAnim
- 6 Understanding the XML trace file format
- 7 F.A.Q
Feature-set in NetAnim 3.0
- Animate wired-links and wireless-links based simulations. LTE-packets cannot be animated, but topology will be shown
- Complete redesign using the QGraphics framework
- Packet statistics with filter
- Node position statistics with node trajectory plotting
- Improved window re-sizing and zooming
- QT4 development packages (recommended version 4.7)
Debian/Ubuntu Linux distribution:
- apt-get install mercurial
- apt-get install qt4-dev-tools
Red Hat/Fedora based distribution:
- yum install mercurial
- yum install qt4
- yum install qt4-devel
- Qt4 : Install Qt4 (including Qt Creator if possible) from http://qt.nokia.com/downloads/
- NetAnim 3.0:
hg clone http://code.nsnam.org/jabraham3/netanim (preferred)
http://www.nsnam.org/tools/netanim.3.0-03-01-2012.tgz (Mar-1-2012) http://www.nsnam.org/tools/netanim.3.0.tgz (Feb-28-2012)
- NetAnim 2.0:
Go to this link NetAnim2
- NetAnim 1.0:
Go to this link NetAnim 1.0
NetAnim uses a QT4 build tool called qmake. Only qmake version 4.7 is supported Please read the #Prerequisites before proceeding
cd netanim make clean qmake NetAnim.pro (For MAC Users: qmake -spec macx-g++ NetAnim.pro) make
Note: qmake could be "qmake-qt4" in some systems
This should create an executable named "NetAnim" in the same directory
Using NetAnim is a two-step process.
Step 1: Generate the animation XML trace file during simulation using "ns3::AnimationInterface" in the ns-3 code base
Step 2: Load the XML trace file generated in Step 1 with the offline animator (NetAnim).
Using ns3::AnimationInterface to generate Animation trace files
The NetAnim application requires a custom trace file for animation. This trace file is created by AnimationInterface in ns-3.
- Model is at: src/netanim/model
- Examples are at src/netanim/examples
Recommended set of steps
Here is the recommended set of steps for generating XML Animation traces.They must be applied just before the "Simulation::Run" statement.
NOTE: A node must have an associated mobility model in-order to be displayed on the animation. This applies for both stationary and mobile nodes (See notes below)
0. Ensure that your wscript includes the "netanim" module. Example as in: src/netanim/examples/wscript. Also include the header [#include "ns3/netanim-module.h"] in your test program 1. AnimationInterface anim ("animation.xml") [for versions before ns-3.13 you have to uncomment the line "anim.SetXMLOutput() to generate XML] 2. anim.SetMobilityPollInterval (Seconds (1));[OPTIONAL] 3. anim.SetConstantPosition (Ptr< Node > n, double x, double y); [OPTIONAL] 4. Simulator::Run();
Try to keep the above as close as possible to the "Simulator::Run()" statement
Running an Example File to generate XML trace file
The netanim example files are located under "src/netanim/examples"
./waf --run "dumbbell-animation --nLeftLeaf=5 --nRightLeaf=5 --animFile=dumbbell.xml" ./waf --run "grid-animation --xSize=5 --ySize=5 --animFile=grid.xml"
Setting the location of nodes
NetAnim requires a location to be assigned to each Node, in-order to be shown on the animation.
For stationary nodes:
- You should assign the ConstantPositionMobilityModel. Constant Position is a kind of mobility.
Here is an example:
1. Ptr<Node> n = nodecontainer.Get (1); 2. AnimationInterface anim ("anim.xml"); 2. anim.SetConstantPosition (n, 100, 200);
1. Get a Ptr to Node from the node container 2. Instantiate an object of type AnimationInterface 3. Set a node pointed to by "n" to the x-coordinate of 100 and y-coordinate of 200
For mobile nodes
- You should assign any suitable Mobility model.
The examples for these are found in places such as src/mobility/examples or examples/routing/manet-routing-compare.cc etc
The ns3::AnimationInterface class is responsible for the creation of the xml trace files. Currently, in basic-mode, AnimationInterface records the position of the nodes at every periodic interval. This interval is 200 ms by default. This will become more efficient in future releases. This has the potential to cause a. Slowness in simulation b. Large XML trace files
Some ways to get around this is to identify if your topology has
- only stationary nodes and hence no mobility
- or slow-moving nodes
If the above is the case you should use AnimationInterface::SetMobilityPollInterval to set the poll interval to a high value.
Using the XML trace with NetAnim
Run NetAnim and click the file-open button on the top-left hand corner and select the XML trace file that was discussed in the previous sections
- Here is a youtube video demonstrating how to load the XML file click here
- Here is a youtube video demonstrating Animation for Wired transmission click here
- Here is a youtube video demonstrating Animation for Wireless transmission click here
- Here is a youtube video demonstrating Animation for Node trajectory click here
The update rate slider
This slider controls the interval between updating animation. If it is low, more packets will be animated, but the simulation progress will be slow
If it is high, some packets may get skipped, although the simulation may progress faster.
NetAnim uses the first/last bit transmit and receive time to show animations accurately. So if you can pick up your physical cable (assume it is transparent) and can see packets flowing then you can see it with NetAnim as well. But often, the low application data-rate or high bandwidth/low propagation delay links may make it impossible to see packets flowing because they travel really fast. In such situations (especially wireless and CSMA) use the "update rate interval" slider to slow down the animation. Also toggle the precision button, to downgrade the precision for CSMA links
The Precision Button
If you disable precision by toggling this button, the animation on wired-links may not be granular (separating individual packets on the link. Small packets and large packets will look similar). It is recommended to disable Precision when using CSMA links
Understanding the XML trace file format
Parts of the XML
The XML trace files has the following main sections
- packets (packets over wired-links)
- wpackets (packets over wireless-links.LTE not supported)
Nodes are identified by their unique Node id. The XML begins with the "information" element describing the rest of the elements
This is the XML root element. All other elements fall within this element
Attributes are: lp = Logical Processor Id (Used for distributed simulations only)
This elements contains the Node and Link elements.It describes, the co-ordinates of the canvas used for animation.
Attributes are: minX = minimum X coordinate of the animation canvas minY = minimum Y coordinate of the animation canvas maxX = maximum X coordinate of the animation canvas maxY = maximum Y coordinate of the animation canvas Example: <topology minX = "-6.42025" minY = "-6.48444" maxX = "186.187" maxY = "188.049">
This element describes each Node's Id and X,Y co-ordinate (position)
Attributes are: lp = Logical Processor Id (Used for distributed simulations only) id = Node Id locX = X coordinate locY = Y coordinate
Example: <node lp = "0" id = "8" locX = "107.599" locY = "96.9366" />
This element describes wired links between two nodes.
Attributes are: fromLp = From logical processor Id (Used for distributed simulations only) fromId = From Node Id (first node id) toLp = To logical processor Id toId = To Node Id (second node id) Example: <link fromLp="0" fromId="0" toLp="0" toId="1"/>
This element describes a packet over wired links being transmitted at some node and received at another The reception details is described in it associated rx element
Attributes are: fromLp = From logical processor Id (Used for distributed simulations only) fromId = Node Id transmitting the packet fbTx = First bit transmit time of the packet lbTx = Last bit transmit time of the packet
Example: <packet fromLp="0" fromId="1" fbTx="1" lbTx="1.000067199"><rx toLp="0" toId="0" fbRx="1.002" lbRx="1.002067199"/> Packet over wired-links from Node 1 was received at Node 0. The first bit of the packet was transmitted at the 1th second, the last bit was transmitted at the 1.000067199th second of the simulation Node 0 received the first bit of the packet at the 1.002th second and the last bit of the packet at the 1.002067199th second of the simulation
NOTE: A packet with fromId == toId is a dummy packet used internally by the AnimationInterface.Please ignore this packet
This element describes the reception of a packet at a node
Attributes are: toLp = To logical processor Id toId = Node Id receiving the packet fbRx = First bit Reception Time of the packet lbRx = Last bit Reception Time of the packet
This element describes a packet over wireless links being transmitted at some node and received at another The reception details is described in it associated rx element
Attributes are: fromLp = From logical processor Id (Used in distributed simulations only) fromId = Node Id transmitting the packet fbTx = First bit transmit time of the packet lbTx = Last bit transmit time of the packet range = Range of the transmission
Example: <wpacket fromLp = "0" fromId = "20" fbTx = "0.003" lbTx = "0.003254" range = "59.68176982"> <rx toLp="0" toId="32" fbRx="0.003000198" lbRx="0.003254198"/> Packet over wireless-links from Node 20 was received at Node 32. The first bit of the packet was transmitted at the 0.003th second, the last bit was transmitted at the 0.003254 second of the simulation Node 0 received the first bit of the packet at the 0.003000198 second and the last bit of the packet at the 0.003254198 second of the simulation
- I can see the nodes and topology but cannot see packets animated
>> NetAnim uses the first/last bit transmit and receive time to show animations accurately. So if you can pick up your physical cable (assume it is transparent) and can see packets flowing then you can see it with NetAnim as well. But often, the low application data-rate or high bandwidth/low propagation delay links may make it impossible to see packets flowing because they travel really fast. In such situations (especially wireless and CSMA) use the "update rate interval" slider to slow down the animation. Also toggle the precision button, to downgrade the precision for CSMA links