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Mengistu, Dawit
Publications (10 of 13) Show all publications
Mengistu, D. (2011). Improving the performance of distributed multi-agent based simulation. (Doctoral dissertation). Karlskrona: Blekinge Institute of Technology
Open this publication in new window or tab >>Improving the performance of distributed multi-agent based simulation
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This research investigates approaches to improve the performance of multi-agent based simulation (MABS) applications executed in distributed computing environments.  MABS is a type of micro-level simulation used to study dynamic systems consisting of interacting entities, and in some cases, the number of the simulated entities can be very large.  Most of the existing publicly available MABS tools are single-threaded desktop applications that are not suited for distributed execution.  For this reason, general-purpose multi-agent platforms with multi-threading support are sometimes used for deploying MABS on distributed resources.  However, these platforms do not scale well for large simulations due to huge communication overheads.  In this research, different strategies to deploy large scale MABS in distributed environments are explored, e.g., tuning existing multi-agent platforms, porting single-threaded MABS tools to distributed environment, and implementing a service oriented architecture (SOA) deployment model.

Although the factors affecting the performance of distributed applications are well known, the relative significance of the factors is dependent on the architecture of the application and the behaviour of the execution environment. We developed mathematical performance models to understand the influence of these factors and, to analyze the execution characteristics of MABS.  These performance models are then used to formulate algorithms for resource management and application tuning decisions.

The most important performance improvement solutions achieved in this thesis include: predictive estimation of optimal resource requirements, heuristics for generation of agent reallocation to reduce communication overhead and, an optimistic synchronization algorithm to minimize time management overhead.  Additional application tuning techniques such as agent directory caching and message aggregations for fine-grained simulations are also proposed.  These solutions were experimentally validated in different types of distributed computing environments.

Another contribution of this research is that all improvement measures proposed in this work are implemented on the application level.  It is often the case that the improvement measures should not affect the configuration of the computing and communication resources on which the application runs.  Such application level optimizations are useful for application developers and users who have limited access to remote resources and lack authorization to carry out resource level optimizations.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Institute of Technology, 2011. p. 213
Series
Blekinge Institute of Technology doctoral dissertation series, ISSN 1653-2090 ; 2011:04
Keywords
agent based simulation, MABS, distributed systems, application performance
National Category
Computer Sciences
Identifiers
urn:nbn:se:hkr:diva-11457 (URN)9789172951983 (ISBN)
Available from: 2013-12-17 Created: 2013-12-16 Last updated: 2018-01-11Bibliographically approved
Mengistu, D. & Löwis, M. (2009). An algorithm for optimistic distributed simulations. In: IASTED International Conference on Modelling, Simulation and Identification: . Paper presented at MSI 2009 (pp. 231-237).
Open this publication in new window or tab >>An algorithm for optimistic distributed simulations
2009 (English)In: IASTED International Conference on Modelling, Simulation and Identification, 2009, p. 231-237Conference paper, Published paper (Refereed)
Abstract [en]

Distributed simulation has traditionally suffered from synchronization constraints that reduce the speedup significantly below the theoretical maximum. One solution approach are optimistic synchronization algorithms, allowing some nodes to advance in model time. In this paper, we present a novel algorithm that does not share the typical rollback costs of optimistic simulation, at the expense of restrictions on the design of simulation models. We have implemented that algorithm in an agent-based simulation framework, and evaluate its performance gains through measurements on actual simulation models.

National Category
Computer Sciences
Identifiers
urn:nbn:se:hkr:diva-11449 (URN)9780889868397 (ISBN)
Conference
MSI 2009
Available from: 2013-12-16 Created: 2013-12-16 Last updated: 2018-01-11Bibliographically approved
Mengistu, D., Davidsson, P., Lundberg, L. & Tröger, P. (2009). Performance modeling and optimization of agent based simulations in distributed environment. In: Proceedings of The Social Simulation Workshop at the International joint Conference on Artificial Intelligence: . Paper presented at SS@IJCAI (pp. 79-92).
Open this publication in new window or tab >>Performance modeling and optimization of agent based simulations in distributed environment
2009 (English)In: Proceedings of The Social Simulation Workshop at the International joint Conference on Artificial Intelligence, 2009, p. 79-92Conference paper, Published paper (Refereed)
National Category
Computer Sciences
Identifiers
urn:nbn:se:hkr:diva-11448 (URN)
Conference
SS@IJCAI
Available from: 2013-12-16 Created: 2013-12-16 Last updated: 2018-01-11Bibliographically approved
Mengistu, D., Davidsson, P. & Lundberg, L. (2008). Middleware support for performance improvement of MABS applications in the Grid environment. In: Luis Antunes, Mario Paolucci & Emma Norling (Ed.), Multi-agent-based simulation VIII: International workshop, MABS 2007, Honolulu, HI, USA, May 15, 2007, revised and invited papers. Paper presented at 8th International Workshop on Multi-Agent-Based Simulation (pp. 20-35). Berlin: Springer Berlin/Heidelberg
Open this publication in new window or tab >>Middleware support for performance improvement of MABS applications in the Grid environment
2008 (English)In: Multi-agent-based simulation VIII: International workshop, MABS 2007, Honolulu, HI, USA, May 15, 2007, revised and invited papers / [ed] Luis Antunes, Mario Paolucci & Emma Norling, Berlin: Springer Berlin/Heidelberg, 2008, p. 20-35Conference paper, Published paper (Refereed)
Abstract [en]

The computational Grid is an infrastructure which enables the execution of applications demanding huge computing resources. Hence, it can be the right environment for large-scale Multi-agent based simulation (MABS) applications. However, due to the nature of the Grid and the characteristics of MABS, achieving optimum performance poses a great challenge. Performance study of MABS applications is therefore a necessary undertaking which requires an understanding of these characteristics and the extent of their influence. Moreover, owing to the dynamicity and heterogeneity of the Grid, it is difficult to achieve performance gains without a middleware support for application deployment and dynamic reconfiguration. This paper presents a study of the key features of MABS applications that affect performance and proposes a supportive middleware to MABS platforms. Experiments show that the proposed middleware can bring performance improvement for MABS applications on the Grid.

Place, publisher, year, edition, pages
Berlin: Springer Berlin/Heidelberg, 2008
Series
Lecture notes in computer science ; 0302-9743
National Category
Computer Sciences
Identifiers
urn:nbn:se:hkr:diva-11439 (URN)000258329600003 ()978-3-540-70915-2 (ISBN)978-3-540-70916-9 (ISBN)
Conference
8th International Workshop on Multi-Agent-Based Simulation
Available from: 2013-12-13 Created: 2013-12-13 Last updated: 2018-01-11Bibliographically approved
Mengistu, D. & Tröger, P. (2008). Performance optimization for multi-agent based simulation in Grid environments. In: Thierry Priol, Laurent Lefevre, and Rajkumar Buyya (Ed.), 8th IEEE International symposium on cluster computing and the Grid, 2008: . Paper presented at 8th IEEE International symposium on cluster computing and the Grid (pp. 560-565). Los Alamitos: Ieee Computer Soc
Open this publication in new window or tab >>Performance optimization for multi-agent based simulation in Grid environments
2008 (English)In: 8th IEEE International symposium on cluster computing and the Grid, 2008 / [ed] Thierry Priol, Laurent Lefevre, and Rajkumar Buyya, Los Alamitos: Ieee Computer Soc , 2008, p. 560-565Conference paper, Published paper (Refereed)
Abstract [en]

Multi-agent based simulation (MABS) is a discrete event simulation technique used to study complex systems with entities having social and autonomous behavior. MABS applications are characterized by unpredictable execution behavior and high communication-to-computation ratio. In this paper, we propose an adaptation strategy to support efficient execution of large-scale MABS applications on typical Grid infrastructures. To achieve this objective, the behavior of MABS applications and the execution environment is investigated, in order to constantly obtain performance prediction models. These models will then be used to realize dynamic load balancing and resource allocation schemes. We discuss our basic approach, initial experimental results, the planned future research and an application of our research in the transportation and logistics simulation domain.

Place, publisher, year, edition, pages
Los Alamitos: Ieee Computer Soc, 2008
National Category
Computer Sciences
Identifiers
urn:nbn:se:hkr:diva-11440 (URN)10.1109/CCGRID.2008.114 (DOI)000270502300069 ()978-1-4244-4237-9 (ISBN)
Conference
8th IEEE International symposium on cluster computing and the Grid
Available from: 2013-12-13 Created: 2013-12-13 Last updated: 2018-01-11Bibliographically approved
Mengistu, D., Tröger, P., Lundberg, L. & Davidsson, P. (2008). Scalability in distributed multi-agent based simulations: the JADE case (596ed.). In: Second International Conference on Future Generation Communication and Networking Symposia, 2008. Vol. 5: . Paper presented at International Conference on Future Generation Communication and Networking Symposia (pp. 596-602). Los Alamitos: Ieee Computer Soc
Open this publication in new window or tab >>Scalability in distributed multi-agent based simulations: the JADE case
2008 (English)In: Second International Conference on Future Generation Communication and Networking Symposia, 2008. Vol. 5, Los Alamitos: Ieee Computer Soc , 2008, 596, , p. 602p. 596-602Conference paper, Published paper (Refereed)
Abstract [en]

Agent platforms provide a framework for development and execution of parallel applications such as multi-agent based simulation (AMBS). However, these platforms have limitations to support large-scale MABS applications in practice. This paper aims at investigating and improving the performance of an agent platform with a AMBS workload in distributed environments. We carried out an experimental study with the JADE framework as our agent platform. The experiments show the performance characteristics of the workload and that JADE does not scale well due to message transport and agent directory service limitations. We propose solutions to overcome these performance bottlenecks and facilitate the efficient execution of AMBS in a distributed environment. Initial experimental results demonstrate the feasibility of the proposed approaches.

Place, publisher, year, edition, pages
Los Alamitos: Ieee Computer Soc, 2008. p. 602 Edition: 596
National Category
Computer Sciences
Identifiers
urn:nbn:se:hkr:diva-11441 (URN)10.1109/FGCNS.2008.158 (DOI)000270432000123 ()978-1-4244-3430-5 (ISBN)
Conference
International Conference on Future Generation Communication and Networking Symposia
Available from: 2013-12-13 Created: 2013-12-13 Last updated: 2018-01-11Bibliographically approved
Mengistu, D., Davidsson, P. & Lundberg, L. (2007). A grid based simulation environment for mobile distributed applications. In: Kim, S.S.; Park, J.H.; Pissinou, N.; Kim, T.H.; Fang, W.C.; Slezak, D.; Arabnia, H.R.; Howard, D. (Ed.), 2007 International Conference on Multimedia and Ubiquitous Engineering: proceedings: MUE 2007: 26-28 April, 2007, Seoul, Korea. Paper presented at International Conference on Multimedia and Ubiquitous Engineering (pp. 1093-1099). Los Alamitos, Calif.: IEEE Computer Society
Open this publication in new window or tab >>A grid based simulation environment for mobile distributed applications
2007 (English)In: 2007 International Conference on Multimedia and Ubiquitous Engineering: proceedings: MUE 2007: 26-28 April, 2007, Seoul, Korea / [ed] Kim, S.S.; Park, J.H.; Pissinou, N.; Kim, T.H.; Fang, W.C.; Slezak, D.; Arabnia, H.R.; Howard, D., Los Alamitos, Calif.: IEEE Computer Society, 2007, p. 1093-1099Conference paper, Published paper (Refereed)
Abstract [en]

Using simulation environments to support mobile distributed application development has many benefits. Since mobile devices can be modeled as autonomous intelligent agents, the multi agent based simulation (MABS) approach is useful for such applications. In this paper, we propose a MABS platform on the computational Grid for mobile distributed computing. A prototype of the proposed platform is implemented and its performance characteristics are studied The findings of the experiment show that a Grid based MABS platform can provide a scalable simulation environment for mobile distributed applications.

Place, publisher, year, edition, pages
Los Alamitos, Calif.: IEEE Computer Society, 2007
National Category
Computer Sciences
Identifiers
urn:nbn:se:hkr:diva-11452 (URN)000247093600183 ()978-0-7695-2777-2 (ISBN)
Conference
International Conference on Multimedia and Ubiquitous Engineering
Available from: 2013-12-16 Created: 2013-12-16 Last updated: 2018-01-11Bibliographically approved
Davidsson, P., Holmgren, J., Kyhlbäck, H., Mengistu, D. & Persson, M. (2007). Applications of agent based simulation. In: Luis Antunes & Keiki Takadama (Ed.), Multi-agent-based simulation VII: International workshop, MABS 2006, Hakodate, Japan, May 8, 2006, revised and invited papers. Paper presented at 7th International Workshop on Multi-Agent-Based Simulation (pp. 15-27). Berlin: Springer Berlin/Heidelberg
Open this publication in new window or tab >>Applications of agent based simulation
Show others...
2007 (English)In: Multi-agent-based simulation VII: International workshop, MABS 2006, Hakodate, Japan, May 8, 2006, revised and invited papers / [ed] Luis Antunes & Keiki Takadama, Berlin: Springer Berlin/Heidelberg, 2007, p. 15-27Conference paper, Published paper (Refereed)
Abstract [en]

This paper provides a survey and analysis of applications of Agent Based Simulation (ABS). A framework for describing and assessing the applications is presented and systematically applied. A general conclusion from the study is that even if ABS seems a promising approach to many problems involving simulation of complex systems of interacting entities, it seems as the full potential of the agent concept and previous research and development within ABS often is not utilized. We illustrate this by providing some concrete examples. Another conclusion is that important information of the applications, in particular concerning the implementation of the simulator, was missing in many papers. As an attempt to encourage improvements we provide some guidelines for writing ABS application papers.

Place, publisher, year, edition, pages
Berlin: Springer Berlin/Heidelberg, 2007
Series
Lecture notes in computer science, ISSN 0302-9743 ; 4442
National Category
Computer Sciences
Identifiers
urn:nbn:se:hkr:diva-11438 (URN)000251466000002 ()978-3-540-76536-3 (ISBN)978-3-540-76539-4 (ISBN)
Conference
7th International Workshop on Multi-Agent-Based Simulation
Available from: 2013-12-13 Created: 2013-12-13 Last updated: 2018-01-11Bibliographically approved
Mengistu, D. (2007). Multi-agent based simulations in the grid environment. (Licentiate dissertation). Karlskrona: Department of Systems and Software Engineering, Blekinge Institute of Technology
Open this publication in new window or tab >>Multi-agent based simulations in the grid environment
2007 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The computational Grid has become an important infrastructure as an execution environment for scientific applications that require large amount of computing resources.  Applications which would otherwise be unmanageable or take a prohibitively longer execution time under previous computing paradigms can now be executed efficiently on the Grid within a reasonable time.

Multi-agent based simulation (MABS) is a methodology used to study and understand the dynamics of real world phenomena in domains involving interaction and/or cooperative problem solving where the participants are characterized by entities having autonomous and social behaviour.  For certain domains the size of the simulation is extremely large, intractable without employing adequate computing resources such as the Grid. 

Although the Grid has come with immense opportunities to resource demanding applications such as MABS, it has also brought with it a number of challenges related to performance.  Performance problems may have their origins either on the side of the computing infrastructure or the application itself, or both. 

This thesis aims at improving the performance of MABS applications by overcoming problems inherent to the behaviour of MABS applications.  It also studies the extent to which the MABS technologies have been exploited in the field of simulation and find ways to adapt existing technologies for the Grid.  It investigates performance monitoring and prediction systems in the Grid environment and their implementation for MABS application with the purpose of identifying application related performance problems and their solutions.

Our research shows that large-scale MABS applications have not been implemented despite the fact that many problem domains that cannot be studied properly with only partial simulation.  We assume that this is due to the lack of appropriate tools such as MABS platforms for the Grid.  Another important finding of this work is the improvement of application performance through the use of MABS specific middleware.

Place, publisher, year, edition, pages
Karlskrona: Department of Systems and Software Engineering, Blekinge Institute of Technology, 2007. p. 104
Series
Blekinge Institute of Technology Licentiate Dissertation Series, ISSN 1650-2140 ; 2007:06
Keywords
Agenter (datorprogram)
National Category
Computer Sciences
Identifiers
urn:nbn:se:hkr:diva-11456 (URN)9789172951181 (ISBN)
Available from: 2013-12-16 Created: 2013-12-16 Last updated: 2018-01-11Bibliographically approved
Mengistu, D., Lundberg, L. & Davidsson, P. (2007). Performance prediction of multi-agent based simulation applications on the Grid. International Journal of Intelligent Technology, 2(3), 166-171
Open this publication in new window or tab >>Performance prediction of multi-agent based simulation applications on the Grid
2007 (English)In: International Journal of Intelligent Technology, ISSN 1305-6417, Vol. 2, no 3, p. 166-171Article in journal (Refereed) Published
Abstract [en]

A major requirement for Grid application developers is ensuring performance and scalability of their applications. Predicting the performance of an application demands understanding its specific features. This paper discusses performance modeling and prediction of multi-agent based simulation (MABS) applications on the Grid. An experiment conducted using a synthetic MABS workload explains the key features to be included in the performance model. The results obtained from the experiment show that the prediction model developed for the synthetic workload can be used as a guideline to understand to ,estimate the performance characteristics of real world simulation applications.

National Category
Computer Sciences
Identifiers
urn:nbn:se:hkr:diva-11454 (URN)
Available from: 2013-12-16 Created: 2013-12-16 Last updated: 2018-01-11Bibliographically approved

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