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MyP2PWorld: Highly Reproducible Application-level Emulation of P2P Systems
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS. (SCS)
Peerialism Inc., Sweden.
Cairo University, Egypt.
Peerialism Inc., Sweden.
Show others and affiliations
2008 (English)In: SASOW 2008: SECOND IEEE INTERNATIONAL CONFERENCE ON SELF-ADAPTIVE AND SELF-ORGANIZING SYSTEMS WORKSHOPS, PROCEEDINGS, LOS ALAMITOS: IEEE COMPUTER SOC , 2008, 272-277 p.Conference paper, Published paper (Other academic)
Abstract [en]

In this paper we describe an application-level emulator for P2P systems with a special focus on high reproducibility We achieve reproduciblity by taking control over the scheduling of concurrent events from the operating system. We accomplish that for inter- and intra- peer concurrency The development of the system was driven by the need to enhance the testing process of an already-developed industrial product. Therefore, we were constrained by the architecture of the overlying application. However, we managed to provide highly transparent emulation by wrapping standard/widely-used networking and concurrency APIs. The resulting environment has proven to be useful in a production environment. At this stage, it started to be general enough to be used in the testing process of applications other than the one it was created to test.

Place, publisher, year, edition, pages
LOS ALAMITOS: IEEE COMPUTER SOC , 2008. 272-277 p.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Computer Engineering
Identifiers
URN: urn:nbn:se:kth:diva-32891ISI: 000273016800047Scopus ID: 2-s2.0-64849102426OAI: oai:DiVA.org:kth-32891DiVA: diva2:412768
Note
QC 20110426Available from: 2011-04-26 Created: 2011-04-26 Last updated: 2011-04-26Bibliographically approved
In thesis
1. Design and Implementation of Centrally-Coordinated Peer-to-Peer Live-streaming
Open this publication in new window or tab >>Design and Implementation of Centrally-Coordinated Peer-to-Peer Live-streaming
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, we explore the use of a centrally-coordinated peer-to-peer overlay as a possible solution to the live streaming problem. Our contribution lies in showing that such approach is indeed feasible given that a number of key challenges are met.

The motivation behind exploring an alternative design is that, although a number of approaches have been investigated in the past, e.g. mesh-pull and tree-push, hybrids and best-of-both-worlds mesh-push, no consensus has been reached on the best solution for the problem of peer-to-peer live streaming, despite current deployments and reported successes.

In the proposed system, we model sender/receiver peer assignments as an optimization problem. Optimized peer selection based on multiple utility factors, such as bandwidth availability, delays and connectivity compatibility, make it possible to achieve large source bandwidth savings and provide high quality of user experience. Clear benefits of our approach are observed when Network Address Translation constraints are present on the network.

We have addressed key scalability issues of our platform by parallelizing the heuristic which is the core of our optimization engine and by implementing the resulting algorithm on commodity Graphic Processing Units (GPUs). The outcome is a Linear Sum Assignment Problem (LSAP) solver for time-constrained systems which produces near-optimal results and can be used for any instance of LSAP, i.e. not only in our system.

 

As part of this work, we also present our experience in working with Network Address Translators (NATs) traversal in peer-to-peer systems. Our contribution in this context is threefold. First, we provide a semi-formal model of state of the art NAT behaviors. Second, we use our model to show which NAT combinations can be theoretically traversed and which not. Last, for each of the combinations, we state which traversal technique should be used. Our findings are confirmed by experimental results on a real network.

Finally, we address the problem of reproducibility in testing, debugging and evaluation of our peer-to-peer application. We achieve this by providing a software framework which can be transparently integrated with any already-existing software and which is able to handle concurrency, system time and network events in a reproducible manner.

 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. viii, 78 p.
Series
Trita-ICT-ECS AVH, ISSN 1653-6363 ; 2011:03
Keyword
peer-to-peer, live-streaming, nat traversal
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Computer Engineering
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-32387 (URN)978-91-7415-957-8 (ISBN)
Presentation
2011-05-05, Sal D, Forum 105, Kista, Stockholm, 14:00 (English)
Opponent
Supervisors
Note
QC 20110426Available from: 2011-04-26 Created: 2011-04-13 Last updated: 2011-04-26Bibliographically approved

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