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Modelnet Emulation environment for wide-area systems

Modelnet Emulation environment for wide-area systems. http://issg.cs.duke.edu/modelnet.html. OVERVIEW. Modelnet is designed to evaluate wide area distributed systems.

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Modelnet Emulation environment for wide-area systems

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  1. ModelnetEmulation environment for wide-area systems http://issg.cs.duke.edu/modelnet.html

  2. OVERVIEW • Modelnet is designed to evaluate wide area distributed systems. • Using the source and destination IP addresses, the emulators determine a path through the virtual topology and handle the packets according to that path. • Each hop on this path has certain bandwidth, queuing, propagation delay, and drop characteristics.

  3. ARCHITECTURE Edge node Emulator node

  4. ARCHITECTURE Edge node (mickey.csee.usf.edu) eth0:2 eth0:3 eth0 eth0:0 eth0:1 eth0:3999 eth0:4000 Emulator node(accura.csee.usf.edu) eth0

  5. ARCHITECTURE Edge node (mickey.csee.usf.edu) 10.0.0.4 eth0 10.0.0.1 10.0.0.1  10.0.0.4 Emulator node(accura.csee.usf.edu) eth0

  6. ARCHITECTURE Edge node (mickey.csee.usf.edu) Routing table on mickey 10.0.0.4 eth0 10.0.0.1 10.0.0.1  10.0.0.4 Emulator node(accura.csee.usf.edu) eth0

  7. ARCHITECTURE 10.0.0.4 10.0.0.1 Emulator node(accura.csee.usf.edu) eth0

  8. USING MODELNET 1. Generate the model network: • Create the graph • Create the route file • Create the machines • Generate the model 2. Deploy the model network 3. Run experiments on the model network

  9. 1. Generating a model network To run a modelnet network, four XML files are needed: • graph - lists the nodes and links of the virtual network • route - contains route data for paths through the virtual network • machines - lists the machines that can be emulators or host virtual nodes. • model - matches nodes and links to host machines and emulator machines

  10. 2 0 1 4 3 Generating a model networkgraph <?xml version="1.0" encoding="ISO-8859-1"?> <topology> <vertices> <vertex int_idx="0" role="gateway" /> <vertex int_idx="1" role="gateway" /> <vertex int_idx="2" role="virtnode" int_vn="0" /> <vertex int_idx="3" role="virtnode" int_vn="1" /> <vertex int_idx="4" role="virtnode" int_vn="2" /> </vertices> <edges> <edge int_dst="1" int_src="2" int_idx="0" specs="client-stub" int_delayms=“1” /> <edge int_dst="2" int_src="1" int_idx="1" specs="client-stub" dbl_kbps="768“ /> <edge int_dst="1" int_src="3" int_idx="2" specs="client-stub" /> <edge int_dst="3" int_src="1" int_idx="3" specs="client-stub" /> <edge int_dst="0" int_src="4" int_idx="4" specs="client-stub" /> <edge int_dst="4" int_src="0" int_idx="5" specs="client-stub" /> <edge int_dst="1" dbl_len="1" int_src="0" int_idx="0" specs="stub-stub" /> <edge int_dst="0" dbl_len="1" int_src="1" int_idx="1" specs="stub-stub" /> </edges> <specs > <client-stub dbl_plr="0" dbl_kbps="64" int_delayms="100" int_qlen="10" /> <stub-stub dbl_plr="0" dbl_kbps="1000" int_delayms="20" int_qlen="10" /> </specs> </topology>

  11. Generating a model networkgraph Example: create a network of 4000 nodes plus 100 clients (virtual nodes) attached among 25 stubs spread throughout the topology: $ inet -n 4000 | inet2xml -p 100 among 25 stubs > example.graph This creates a graph of 4100 vertices and 13488 edges spread among 25 stubs inet2xml converts the inet graph to modelnet XML format. It also allows to specify all the link parameters (bandwidth, latency, drop rate) for all the links types.

  12. Generating a model networkroute The route file store the shortest paths across the virtual network for all pairs of virtual nodes: $ allpairs example.graph > example.route <?xml version="1.0" encoding="ISO-8859-1"?> <allpairs> <path int_vndst="1" int_vnsrc="0" hops="0 3 " /> <path int_vndst="2" int_vnsrc="0" hops="0 5 " /> <path int_vndst="3" int_vnsrc="0" hops="0 7 " /> <path int_vndst="4" int_vnsrc="0" hops="0 9789 9784 5637 5538 9 " /> <path int_vndst="5" int_vnsrc="0" hops="0 9789 9784 5637 5538 11 " /> <path int_vndst="6" int_vnsrc="0" hops="0 9789 9784 5637 5538 13 " /> ………… <path int_vndst="86" int_vnsrc="99" hops="198 13279 2167 201 1670 6266 173 " /> <path int_vndst="87" int_vnsrc="99" hops="198 13279 2167 201 1670 6266 175 " /> <path int_vndst="88" int_vnsrc="99" hops="198 13279 2167 2818 12737 177 " /> <path int_vndst="96" int_vnsrc="99" hops="198 193 " /> <path int_vndst="97" int_vnsrc="99" hops="198 195 " /> <path int_vndst="98" int_vnsrc="99" hops="198 197 " /> </allpairs>

  13. Generating a model networkmachines <?xml version="1.0" encoding="ISO-8859-1"?> <hardware> <emul hostname="accura"/> <host hostname="mickey"/> </hardware>

  14. Generating a model networkmodel $ mkmodel example.graph example.machines > example.model Reading example.graph . . . Reading example.machines . . . Read 4100 vertices and 13487 edges. Mapping graph to 1 emulators and 1 hosts Printing model $ mkmodel assigns the virtual nodes to hosts, and assigns links to emulators

  15. Generating a model networkmodel <?xml version="1.0" encoding="ISO-8859-1"?> <model> <emulators> <emul hostname="accura" int_idx="0"> <host hostname="mickey"> <subnet int_emul="0" int_nodes="100" vbcst="10.0.0.127" vmask="255.255.255.128" vnet="10.0.0.0/25"> <virtnode int_idx="4000" int_vn="0" role="virtnode" vip="10.0.0.1" /> <virtnode int_idx="4097" int_vn="97" role="virtnode" vip="10.0.0.98" /> ………….. <virtnode int_idx="4096" int_vn="96" role="virtnode" vip="10.0.0.97" /> </subnet> </host> </emul> …………… <specs xmloutbug="workaround"> <client-stub dbl_kbps="1000" dbl_plr="0" int_delayms="0" int_qlen="10" /> <stub-stub dbl_kbps="1000" dbl_plr="0" int_delayms="0" int_qlen="10" /> <stub-transit dbl_kbps="1000" dbl_plr="0" int_delayms="0" int_qlen="10" /> <transit-transit dbl_kbps="1000" dbl_plr="0" int_delayms="0" int_qlen="10" /> </specs> </model>

  16. Deploy the model network • Modelnet can be deployed by logging in to each host: $ deployhost example.model example.route • For large emulations, deployment can be automated for all hosts: $ deploy example.model example.route • This command configures all the virtual IP addresses, routes, and loads the topology into the emulator.

  17. Running programs on virtual nodes This is done with the vnrun command. To run the program Gnutella on every virtual node: $ vnrun all example.model gnutella

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