1. 1 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 Social-Aware Virtual Network Embedding for Wireless Content Delivery SAViNE Chrysa Papagianni, Aris Leivadeas, Symeon Papavassiliou Network Management & Optimal Design Laboratory National Technical University of Athens

2. 2 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 Cloud-based Content Delivery Networks constitute a promising alternative to traditional CDNs. The Wireless Cloud represents the cloud computing evolution to wireless and mobile environments, allowing "as a service" provisioning over seamlessly integrated wireless access networks (e.g. WLAN, etc.) Network design and management needs to take into account the Social aspects of operation especially when the transferred content is relevant to the social activities of the users The proposed experiment aims at exploring how SNA inspired metrics can be adopted for fostering content delivery within the evolving wireless Cloud environment. SAViNE Motivation and Vision

3. 3 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 Cloud Based CDN o Key Problem Selection of surrogates to efficiently facilitate content delivery.  Is it different than surrogate placement solutions for traditional CDNs? Results cannot be directly applied to CCDNs [1] e.g. multi-domain environment, replication direction.  Can SNA-inspired metrics be beneficial? [1] F. Chen, K. Guo, J. Lin, and T. F. La Porta, ”Intra-cloud Lightning: Building CDNs in the Cloud,” in IEEE INFOCOM, pp. 433-441, Mar. 2012.

4. 4 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 SAViNE’s Roadmap… Automate SAViNE experimental procedure over: 1.The OpenLab wireless testbeds (NITOS and w-iLab.t) 2.A hybrid (wired and wireless) topology including PlanetLab Europe (PLE) testbed along with the wireless platforms [4] A. Leivadeas, C. Pappagianni and S. Papavassiliou, "Demonstration of a Social Aware Wireless Content Delivery Paradigm", to appear at IEEE Infocom 2014, demo session 1.Formulation of emerging optimization problems and solution strategies - joint surrogate placement / social aware resource mapping problem in the (wireless) cloud [1][2]. 2.The definition of key metrics, reflecting the interests of the different indentified involved players [2][3]. 3.CDN Software evaluation. 4.OpenLab Tetstbed Requirements. [1] Leivadeas, C. Pappagianni and S. Papavassiliou, "Socio-aware Virtual Network Embedding,» IEEE Network Magazine, vol. 6, no. 5, pp. 35 - 43, Sep./Oct 2012 [2] C. Pappagianni, A. Leivadeas and S. Papavassiliou, ”A Cloud-oriented Content Delivery Network Paradigm: Modeling and Assessment,” IEEE TDSC Special Issue on Cloud computing Assessment: metrics, algorithms, policies, models, and evaluation techniques., vol 10, no 5, pp. 287 - 300, Sept.-Oct. 2013. [3] A. Gavras, A. Bak, G. Biczók, P. Gajowniczek, A. Gulyás, H. Hrasnica, P. Martinez-Julia, F. Németh, C. Papagianni, S. Papavassiliou, M. Pilarski, A. Skarmeta: ”Heterogeneous testbeds, tools and experiments - Measurement requirements perspective” In Proceedings of the EULER Workshop on Measurement and Measurement Tools in FIA Aalborg 9-11 May 2012 SAViNE experiment execution Performance Evaluation and SAViNE validation. 1.Feasibility: Performance evaluation of CDNs deployed over the wireless OpenLab infrastructure (NITOS and w-iLab.t) using SAViNE’s SNA-inspired surrogate server placement strategies. 2.Repeatability: Evaluation of the SAViNE experiment's repeatability over the controlled indoor wireless environment at Zwijnaarde testbed. 3.Scalability: Large-scale deployment and evaluation of the proposed SAViNE experiment over the OpenLab infrastructure (including PLE)

5. 5 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 OpenLab Tools Used OMF (Load SAVINE images) Node Location (http://am.wilab2.test/phpmyadmin) OpenVPN server (virtualwall.test.ibbt.be) OMF (Load SAVINE images) Node Info (Advertisement RSpec) Node Location Info (http://nitlab.inf.uth.gr/NITlab/index.php/software- tools/distance-tool) Node Info and Location (Advertisement RSpec ) Slicestat (http://codeen.cs.princeton.edu/slicestat/) DummyNet (https://www.planet- lab.eu/doc/guides/user/practices/emulation)

6. 6 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 OpenLab Benefits Validate SAViNE via experimentation Test SAViNE feasibility in a controlled wireless environment (Zwijnaarde testbed) Test SAViNE feasibility in real world settings Large scale deployment (200 nodes)

7. 7 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 Performance Evaluation Metrics Offline Metrics

8. 8 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 Performance Evaluation Metrics Online Metrics

9. 9 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 Feasibility SNA-VSPSNA-GVSPGS Mapping Cost (%) -16.2523.66 CDN Dep. Cost (%) -19.6226.66 SS61011 Path Length 2.542.342.65 SPBC0.0570.0530.021 SNA-VSPSNA-GVSPGS Response Time 1.712.423.52 Client Request per Surrogate 7.334.44 Average Distance per Surrogate 5.975.986.06 Cache Hit Ratio 0.450.310.20 Throughput (%) 46.35.17- CPU Load (%)2.470.2- SNA-VSP outperforms all greedy heuristics in terms of metrics related to CDN deployment and operation Adopting SNA features contributes to the enhancement of the CDN solution The results at NITOS testbed, validate the results obtained at the w-iLab.t, for a CDN deployed in real world settings.

10. 10 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 Repeatability  Temporal Repeatability  Spatial Repeatability Experimental results are repeatable

11. 11 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 Scalability Federation between PlanetLab – w-iLab.t PlanetLab splits in three sectors (varying set of end users 100-200 at a step of 50) Regio n EastWestNorth Poland (17)Spain (8)Germany (28) Italy (9)France (22)Finland (5) Israel (4)UK (11)Belgium (8) Greece (13)Portugal (3)Czech (2) Hungary (3)Ireland (3)Sweden (4) Austria (4)Switzerland (7)Denmark (2) Cyprus (1)Netherlands (1) Total515450

12. 12 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 Scalability Incremental CDN Deployment Cost Number of Users SNA-VSPSNA-GVSPGS 96122124 150193236 200264246 Number of Surrogates Linear growth with the number of users SNA-VSP cuts down the number of surrogates

13. 13 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 Scalability SNA-VSPSNA-GVSPGS Response Time (sec)2.032.523.80 Client Req. / Surrogate7.834.473.91 Cache Hit Ratio0.500.370.28 CPU Load (%)12.793.4- SNA-VSPSNA-GVSPGS Response Time (sec)2.573.174.32 Client Req. /Surrogate7.734.594.08 Cache Hit Ratio0.520.380.31 CPU Load (%)12.433.0- SNA-VSPSNA-GVSPGS Response Time (sec)2.663.284.40 Client Req. / Surrogate7.574.664.17 Cache Hit Ratio0.520.380.31 CPU Load (%)11.523.2- 96 nodes 150 nodes 200 nodes SNA-VSP manages to select efficiently the surrogates, enhancing the operational efficiency of the CDN As the number of surrogates used by the SNA-VSP decreases, each of them serves more end users, leading to higher CPU load

14. 14 - Testbed Interoperability Pre-FIA Workshop, Athens, 17 April 2014 Thank you for your attention!