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41st International Conference on parallel Processing Workshops, ICPPW 2012

作者： Shen, Jie Fang, Jianbin Sips, Henk Varbanescu, Ana Lucia Parallel and Distributed Systems Group Delft University of Technology Netherlands Department of Computer Systems VU University Amsterdam Netherlands

ISBN: (纸本)9780769547954

OpenCL and OpenMP are the most commonly used programming models for multi-core processors. They are also fundamentally different in their approach to parallelization. In this paper, we focus on comparing the performance of OpenCL and OpenMP. We select three applications from the Rodinia benchmark suite (which provides equivalent OpenMP and OpenCL implementations), and carry out experiments with different datasets on three multi-core platforms. We see that the incorrect usage of the multi-core CPUs, the inherent OpenCL fine-grained parallelism, and the immature OpenCL compilers are the main reasons that lead to the OpenCL poorer performance. After tuning the OpenCL versions to be more CPU-friendly, we show that OpenCL either outperforms or achieves similar performance in more than 80% of the cases. Therefore, we believe that OpenCL is a good alternative for multi-core CPU programming. © 2012 IEEE.

关键词： Program processors

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Towards an effective unified programming model for many-cores

Towards an effective unified programming model for many-core...

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25th IEEE International parallel and distributed Processing Symposium, Workshops and Phd Forum, IPDPSW 2011

作者： Varbanescu, Ana Lucia Hijma, Pieter Van Nieuwpoort, Rob Bal, Henri Computing Systems Group Vrije Universiteit Amsterdam Netherlands Parallel and Distributed Systems Group Delft University of Technology Netherlands ASTRON Dwingeloo Netherlands

ISBN: (纸本)9780769543857

Building an effective programming model for many-core processors is challenging. On the one hand, the increasing variety of platforms and their specific programming models force users to take a hardware-centric approach not only for implementing parallel applications, but also for designing them. This approach diminishes portability and, eventually, limits performance. On the other hand, to effectively cope with the increased number of large-scale workloads that require parallelization, a portable, application-centric programming model is desirable. Such a model enables programmers to focus first on extracting and exploiting parallelism from their applications, as opposed to generating parallelism for specific hardware, and only second on platform-specific implementation and optimizations. In this paper, we first present a survey of programming models designed for programming three families of many-cores: general purpose many-cores (GPMCs), graphics processing units (GPUs), and the Cell/B.E. We analyze the usability of these models, their ability to improve platform programmability, and the specific features that contribute to this improvement. Next, we also discuss two types of generic models: parallelism-centric and application-centric. We also analyze their features and impact on platform programmability. Based on this analysis, we recommend two application-centric models (OmpSs and OpenCL) as promising candidates for a unified programming model for many-cores and we discuss potential enhancements for them. © 2011 IEEE.

关键词： Computer graphics

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NDRank: optimised parallel search for weather analogues

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Big Earth Data 2023年第2期7卷 276-297页

作者： David Martins Miguel Ferreira João Nuno Silva Instituto Superior Técnico Universidade de LisboaLisboaPortugal Caravela Energy Partners DarienConnecticutUSA Distributed Parallel and Secure Systems GroupINESC-ID LisboaLisboaPortugal

Global meteorology data are now widely used in various areas, but one of its applications, weather analogues, still require exhaustive searches on the whole historical data. We present two optimisations for the state-of-the-art weather analogue search algorithms: a parallelization and a heuristic search. The heuristic search (NDRank) limits of the final number of results and does initial searches on a lower resolution dataset to find candidates that, in the second phase, are locally validated. These optimisations were deployed in the Cloud and evaluated with ERA5 data from ECMWF. The proposed parallelization attained speedups close to optimal, and NDRank attains speedups higher than 4. NDRank can be applied to any parallel search, adding similar speedups. A substantial number of executions returned a set of analogues similar to the existing exhaustive search and most of the remaining results presented a numerical value difference lower than 0.1%. The results demonstrate that it is now possible to search for weather analogues in a faster way (even compared with parallel searches) with results with little to no error. Furthermore, NDRank can be applied to existing exhaustive searches, providing faster results with small reduction of the precision of the results.

关键词： Multidimensional arrays weather analogues search parallel computing algorithm optimisation

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Detection of covert botnet command and control channels by causal analysis of traffic flows

Detection of covert botnet command and control channels by c...

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5th International Symposium on Cyberspace Safety and Security, CSS 2013

作者： Burghouwt, Pieter Spruit, Marcel Sips, Henk Parallel and Distributed Systems Group Delft University of Technology Mekelweg 4 Delft 2628CD Netherlands

ISBN: (纸本)9783319035833

The Command and Control communication of a botnet is evolving into sophisticated covert communication. Techniques as encryption, steganography, and recently the use of social network websites as a proxy, impede conventional detection of botnet communication. In this paper we propose detection of covert communication by passive host-external analysis of causal relationships between traffic flows and prior traffic or user activity. Identifying the direct causes of traffic flows, allows for real-time bot detection with a low exposure to malware, and offline forensic analysis of traffic. The proposed causal analysis of traffic is experimentally evaluated by a self-developed tool called CITRIC with various types of real Command and Control traffic. © Springer International Publishing Switzerland 2013.

关键词： Botnet

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Performance evaluation of a Python implementation of the new LEDBAT congestion control algorithm

Performance evaluation of a Python implementation of the new...

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17th IEEE International Conference on Automation, Quality and Testing, Robotics, AQTR 2010

作者： Andreica, Mugurel Ionuţ Ţâpuş, Nicolae Pouwelse, Johan Computer Science Department Politehnica University of Bucharest Romania Parallel and Distributed Systems Group Delft University of Technology Netherlands

ISBN: (纸本)9781424467259

LEDBAT is a new congestion control algorithm which was proposed in an IETF draft in March 2009. LEDBAT's goal is to provide a less-than-best-effort data transport service, i.e. a LEDBAT flow should back-off in the presence of other competing flows (TCP flows in particular). Because of its intended friendliness to competing flows, LEDBAT has already been implemented in the popular Bittorrent client uTorrent. In this paper we present performance evaluation results for our Python implementation of LEDBAT. We ran tests both in emulated networks as well as in real world networks. One of the tests involved approximately 300 volunteers spread throughout the world.

关键词： Python

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HAS DEDICATED HARDWARE FOR PROLOG A FUTURE

HAS DEDICATED HARDWARE FOR PROLOG A FUTURE

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INTERNATIONAL WORKSHOP ON PROCESSING DECLARATIVE KNOWLEDGE ( PDK 91 )

作者： DOROCHEVSKY, M NOYE, J THIBAULT, O European Computer-Industry Research Centre Parallel and Distributed Systems Group Arabellastr. 17 München 81 D-8000 Germany

ISBN: (纸本)354055033X

Efficiency has always been one of the problems of high-level languages like Prolog. Different solutions have been suggested to speed up the execution of Prolog. One alternative is to build dedicated hardware. Another alternative, using advanced compilation techniques through global analysis, has been taken recently with spectacular results. A third alternative consists of combining hardware and software solutions. This paper discusses the relative merits and shortcomings of the three approaches in the light of the experiince gained at ECRC in the KCM (Knowledge Crunching Machine) project, the ultimate question being: “Has dedicated hardware for Prolog a future?”. © 1991, Springer Verlag. All rights reserved.

关键词： Computer circuits

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Multi radio diversity for satellite-terrestrial mobile communications

Multi radio diversity for satellite-terrestrial mobile commu...

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2008 4th IEEE International Conference on Circuits and systems for Communications, ICCSC

作者： Khan, A.A. Adda, A. Khan, T.A. Systems Engineering Research Group Faculty of Technology University of Portsmouth Faculty of Technology University of Portsmouth Parallel and Distributed Systems Research Group Signals and Systems Ltd. Rawalpindi Pakistan

ISBN: (纸本)9781424417087

This paper presents the study of the resource allocation problem in hybrid terrestrial and satellite mobile communication networks. The number of terrestrial and satellite mobile communication standards is increasing, as well as the number of users in the market. Efficient access allocation schemes not only aid network operators with better resource utilizations but also provide the users with better service times, specifically required in emergency/high load situations. The degree of internetworking in access allocation procedures varies from tight to very loose internetworking. In this paper we present a parallel Multi Radio Diversity (MRD) based access allocation scheme in a hybrid terrestrial-satellite network which through diversity gains, results in improved mean service time. The analysis is validated via dynamic system level simulation of a sub-urban area. ©2008 IEEE.

关键词： Satellites

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A resource based framework for planning and replanning

A resource based framework for planning and replanning

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作者： Van Krogt, Roman Der De Weerdt, Mathijs Witteveen, Cees Parallel and Distributed Systems Group Delft University of Technology PO Box 5031 2600 GA Delft Netherlands

ISBN: (纸本)0769519318

We discuss a rigorous unifying framework for both planning and replanning, extending an existing logic-based approach to resource-based planning. The primitive concepts in this Action Resource Framework (ARF) are actions and resources. Actions consume and produce resources. Plans are structures composed of actions, resource facts and an explicit dependency function specifying their interrelationships. In this framework, both planning and replanning are conceived as plan transformation processes accomplished by applying sequences of operations on plans. For this, we introduce operators for plan transformation and define the concept of a plan library. Using a refinement planning template, we show how some existing (re)planning methods and heuristics can be described as special cases of this framework. The advantage of the framework is that it offers a unifying view on planning and replanning. © 2003 IEEE.

关键词： Heuristic methods

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Virtual memory support for OR-parallel logic programming systems 3rd

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3rd International Conference on parallel Architectures and Languages Europe, PARLE 1991

作者： Véron, André Xu, Jiyang Delgado-Rannauro, S.A. Schuerman, K. Distributed and Parallel Systems Group European Computer-Industry Research Center Arabellastr. 17 München 81D-8000 Germany

ISBN: (纸本)9783540541523

Most previous parallel logic programming systems have been built on top of classical operating systems. The advances in the area of parallel operating systems have made it possible to explore new execution models that take advantage of their features. In this paper we propose a family of execution models (VM,VMBA,VMHW) that make use of the new virtual memory technologies such as copy-on-write, memory inheritance, and distributed shared memory. Preliminary results from our implementations and simulations are reported. © Springer-Verlag Berlin Heidelberg 1991.

关键词： Computer circuits

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DMSS: A dynamic memory scheduling system in server consolidation environments

DMSS: A dynamic memory scheduling system in server consolida...

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作者： Liu, Lanzheng Chu, Rui Zhu, Yongchun Zhang, Pengfei Wang, Liufeng National Laboratory for Parallel and Distributed Processing National University of Defense Technology Changsha China Systems and Technology Group IBM China Beijing China

ISBN: (纸本)9780769546698

As the foundation of cloud computing, Server consolidation allows multiple computer infrastructures running as virtual machines in a single physical node. It improves the utilization of most kinds of resource but memory under x86 architecture. Because of inaccurate memory usage estimate and the lack of memory resource management, there is much service performance degradation in data centers, even though they have occupied a large amount of memory. Furthermore, memory becomes insufficient for a physical server when a lot of virtual machines depend on it. In order to improve this, we present a dynamic memory scheduling system called DMSS, which can manage memory resources in server consolidation environments and allocate memory among virtual machines on demand. We have designed and implemented the corresponding memory scheduling policy based on Xen virtualization platform to enhance memory efficiency and achieve service level agreement. The benchmark shows that DMSS can make an accurate and rapid response to memory changes and save more than 30% physical memory with less than 5% performance degradation. DMSS actually brings in economic benefits to cloud service providers because more virtual machines can be accommodated at lower costs. © 2012 IEEE.

关键词： Virtual machine

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