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6th International Conference on Data Science, Technology and Applications, DATA 2017

作者： Bednárek, David Kruliš, Martin Yaghob, Jakub Zavoral, Filip Parallel Architectures/Algorithms/Applications Research Group Charles University Prague Czech Republic

ISBN: (纸本)9783319948089

Electronic sports or pro gaming have become very popular in this millenium and the increased value of this new industry is attracting investors with various interests. One of these interest is game betting, which requires player and team rating, game result predictions, and fraud detection techniques. This paper discusses several aspects of analysis of game recordings in Counter-Strike: Global Offensive game including decoding the game recordings, matching of different sources of player data, quantifying player performance, and evaluation of economical aspects of the game. © Springer International Publishing AG, part of Springer Nature 2018.

关键词： Data integration

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Column-oriented data store for astrophysical data 25

Column-oriented data store for astrophysical data

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25th International Workshop on Database and Expert Systems Applications, DEXA 2014

作者： Yaghob, Jakub Bednarek, David Kruli, Martin Zavoral, Filip Parallel Architectures/Applications/Algorithms Research Group Depratment of Software Engineering Charles University Prague Czech Republic

ISBN: (纸本)9781479957224

Astrophysical databases have used proprietary formats (especially the FITS format) to represent measured data and related metadata. The design of the FITS format was influenced by punch cards, thus it is extremely inappropriate for modern hardware. Even though this format is well established in the domain of astrophysics and will be definitely used as a common ground for data exchange, a new representation is required if the data are to be processed efficiently in a high performance manner. In this paper, we propose a specialized column-oriented format for the measured data, which allows much faster loading from the persistent data storage and direct application of the data in computational operations. Furthermore, we have tested various I/O methods implemented in modern operating systems to accommodate different access patterns that were observed in various use cases. We have created a prototype implementation of the proposed methods and experimentally evaluated their benefits. © 2014 IEEE.

关键词： Electronic data interchange

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A review of bioinspired computer-aided design tools for hardware design

A review of bioinspired computer-aided design tools for hard...

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作者： Lanchares, Juan Garnica, Oscar Fernández-De-Vega, Francisco Ignacio Hidalgo, J. Parallel Architectures and Bioinspired Algorithms Group UCM Madrid Spain Universidad de Extremadura Mérida Spain

During the tools have been also influenced by this evolutionary fashion. In this paper, we give a broader view of the application of techniques inspired by nature to hardware design and parallel architectures problem solving. Our aim is to furnish an overview of the various bioinspired techniques based tools that have been used so far to solve the problems of automatic hardware design. We can claim that a lot of the approaches found in the literature suffer from a lack of interdisciplinary interaction among researchers of both evolutionary computation and hardware design fields. In addition, we have also detected that some multi-objective problems do not use the appropriate algorithms. Copyright © 2012 John Wiley & Sons, Ltd.

关键词： parallel architectures

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The Effectiveness of Cyclic Blockwise Distribution

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Wuhan University Journal of Natural Sciences 1996年第Z1期1卷 410-419页

作者： Mark R. Roest(parallel algorithms group Delft University Of Technology, the Netherlands)(email: roest@dutind3. two. tudelft.nl) Parallel Algorithms Group Delft University of Technology the Netherlands

In spite of the wealth Of existing data distribution methods, most parallel programming languages support only some form of cyclic blockwise distribution. The main reason why only this single method is supported is that it is relatively simple to implement. However, it is as yet nuclear whether cyclic blockwise distribution is sufficiently powerful for a wide class of distribution problems. In this paper the method will be analysed, showing that for a wide range of problems it is indeed sufficient. It will also be shown in which cases cyclic blockwise distribution can be effected to fail. From this analysis, it is possible to formulate practical guidelines to assist Programmers in choosing the cycle frequency for cyclic blockwise distribution that leads to an optimal result.

关键词： The Effectiveness of Cyclic Blockwise Distribution

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Integrated data placement and task assignment for scientific workflows in Clowds

Integrated data placement and task assignment for scientific...

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4th International Workshop on Data-Intensive Distributed Computing, DIDC 2011, held in conjunction with the ACM International Conference on High-Performance parallel and Distributed Computing, HPDC 2011

作者： Çatalyürek, Ümit V. Kaya, Kamer Uçar, Bora Biomedical Informatics Ohio State University United States Parallel Algorithms Group CERFACS France CNRS ENS Lyon France

ISBN: (纸本)9781450307048

We consider the problem of optimizing the execution of dataintensive scientific workflows in the Cloud. We address the problem under the following scenario. The tasks of the workflows communicate through files;the output of a task is used by another task as an input file and if these tasks are assigned on different execution sites, a file transfer is necessary. The output files are to be stored at a site. Each execution site is to be assigned a certain percentage of the files and tasks. These percentages, called target weights, are pre-determined and reflect either user preferences or the storage capacity and computing power of the sites. The aim is to place the data files into and assign the tasks to the execution sites so as to reduce the cost associated with the file transfers, while complying with the target weights. To do this, we model the workflow as a hypergraph and with a hypergraph-partitioning-based formulation, we propose a heuristic which generates data placement and task assignment schemes simultaneously. We report simulation results on a number of real-life and synthetically generated scientific workflows. Our results show that the proposed heuristic is fast, and can find mappings and assignments which reduce file transfers, while respecting the target weights. Copyright 2011 ACM.

关键词： Computing power

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Contemplating efficiency of the ROOT file format for data intensive simulations in particle physics 14

Contemplating efficiency of the ROOT file format for data in...

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14th Conference on Information Technologies - Applications and Theory, ITAT 2014

作者： Zavoral, Filip Yaghob, Jakub Bednárek, David Kruliš, Martin Parallel Architectures/Algorithms/Applications Research Group Faculty of Mathematics and Physics Charles University in Prague Malostranské nám. 25 Prague Czech Republic

ISBN: (纸本)9788087136188

A vast majority of nuclear and particle physicists in the world are currently using the ROOT framework (developed in CERN) as a software platform for simulations and data evaluations. Some of the simulations and experiments performed in this domain are very data intensive and they need to be designed with particular emphasis on the processing performance. We have analyzed the efficiency of the Background Mixer component employed in particle simulations of the Belle II project and identified, that the ROOT file format is unacceptably inefficient. The structure of the file and the API presented in ROOT framework prevents efficient data retrieval for parallel processing. We propose a data format which overcomes these limitations and which is much more suitable for high performance computing. We also demonstrate how to integrate this novel format into processing pipeline of the Belle II experiments and present its initial evaluation. © 2014 F. Zavoral, J. Yaghob, D. Bednárek, M. Kruliš.

关键词： High energy physics

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Critical evaluation of existing external sorting methods in the perspective of modern hardware?

Critical evaluation of existing external sorting methods in ...

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Annual International Workshop on DAtabases, TExts, Specifications and Objects, DATESO 2015

作者： Kruliš, Martin Parallel Architectures/Applications/Algorithms Research Group Faculty of Mathematics and Physics Charles University in Prague Malostranské nám. 25 Prague Czech Republic

External sorting methods which are designed to order large amounts of data stored in persistent memory are well known for decades. These methods were originally designed for systems with small amount of operating (internal) memory and magnetic tapes used as external mem-ory. Data on magnetic tapes has to be accessed in strictly serial man-ner and this limitation shaped the external sorting algorithms. In time, magnetic tapes were replaced with hard drives which are now being re-placed with solid state drives. Furthermore, the amount of the operating memory in mainstream servers have increased by orders of magnitude and the future may hold even more impressive innovations such as non-volatile memories. As a result, most of the assumptions of the external sorting algorithms are not valid any more and these methods needs to be innovated to better reect the hardware of the day. In this work, we critically evaluate original assumptions in empirical manner and propose possible improvements.

关键词： Magnetic tape

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Exploiting HTML5 technologies for distributed parasitic web storge 14

Exploiting HTML5 technologies for distributed parasitic web ...

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14th Annual Workshop on DAtabases, TExts, Specifications and Objects, DATESO 2014

作者： Kruliš, Martin Falt, Zbyněk Zavoral, Filip Parallel Architectures/Applications/Algorithms Research Group Faculty of Mathematics and Physics Charles University in Prague Malostranské nám. 25 Prague Czech Republic

ISBN: (纸本)9788001054826

Current web technologies have been leaping forward, especially since the introduction of HTML5. The web browsers of the day implement various APIs for the client-side scripts, such as elaborate data storage or advanced network connectivity. We propose, how to combine these technologies to create distributed data storage using the web environment. We have implemented a prototype framework as a proof of concept and explored the most problematic issues which require to be researched further. Systems that would use this storage may benefit from the fact that the users do not need to install or configure any type of client application, since the only thing required is the web browser. Web-based distributed data storage can be used as an extension of server storage, for data caching, and in various other applications.

关键词： Web browsers

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Employing evolutionary algorithms for classification of astrophysical spectra 14

Employing evolutionary algorithms for classification of astr...

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14th Conference on Information Technologies - Applications and Theory, ITAT 2014

作者： Bednárek, David Kruliš, Martin Yaghob, Jakub Zavoral, Filip Parallel Architectures/Algorithms/Applications Research Group Faculty of Mathematics and Physics Charles University in Prague Malostranské nám. 25 Prague Czech Republic

ISBN: (纸本)9788087136188

In the past decade, automated astronomical observatories collected huge amounts of data which can no longer be explored by astronomers individually. In our case, we deal with optical spectra produced by multi-object low-resolution spectrographs. Due to lower resolution and higher level of noise in such surveys, individual spectra rarely offer reliable information;however, since many similar objects expectedly exist in the universe, global analysis of the spectrum database may reveal classes of objects sharing similar properties. In this paper, we propose a novel evolutionary approach to classification of spectral data which is expected to achieve finer level of detail than traditional methods. Furthermore, we describe the most computationally-intensive parts of the method in the form of parallel cache-aware algorithm. © 2014 D. Bednárek, M. Kruliš, J. Yaghob, F. Zavoral.

关键词： Evolutionary algorithms

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Assessing applicability of power-efficient embedded devices for micro-cloud computing 15

Assessing applicability of power-efficient embedded devices ...

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15th Conference on Information Technologies - Applications and Theory, ITAT 2015

作者： Kruliš, Martin Stefan, Petr Yaghob, Jakub Zavoral, Filip Parallel Architectures/Algorithms/Applications Research Group Faculty of Mathematics and Physics Charles University in Prague Malostranské nám. 25 Prague Czech Republic

ISBN: (纸本)9781515120650

Distributed computing and cloud phenomenon have become an intensively studied topic in the past decade. These technologies have been enveloped with attractive business models, where the customer pays only for the resources or services which have been actually utilized. Even though this popularity lead to rapid development of distributed algorithms, virtualization platforms, and various cloud services, many issues are still waiting to be solved. One of these issues is the question of power efficiency. In this paper, we investigate possibilities of applying single-board computers as platform for distributed systems and cloud computing. These small devices (such as Raspberry Pi) are quite power efficient and relatively cheap, so they may reduce the overall cost for cloud services. Furthermore, they may be employed to create small clusters that could replace traditional enterprise servers and achieve lower cost and better robustness for some tasks.

关键词： Web services

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