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Panel: Challenge and opportunity of HPC-based distributed systems

Panel: Challenge and opportunity of HPC-based distributed sy...

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International conference on parallel and distributed Systems (ICPADS)

Summary form only given, as follows. While digital device and digital information become immersive, internet computing as a discipline is at a turning point. Modern computing and communication systems are unprecedented powerful and, in the meantime, unprecedented complex. On one hand, new computing paradigms, such as cloud computing, internet of things, cyberinfrastructure, and data centric computing, continue emerging to utilize technological advances. On the other hand, timely challenges, such as reliability, security, power consumption, and coordination and consistency, have to be addressed to meet the ever increasing user demand. High performance computing (HPC) is moving from Peta-flops era to Exa-scale era. How the changing will influence data center based distributed computing, and vice visa. We are at a historical point to ask: what are the challenges and opportunities of HPC-based distributed systems? This is especially true for Far East, where China just historically reached the first place on the HPC top500 list and launched a unique program in Internet of Things. This panel invites outstanding leaders around the world to explore deliberations regarding the strategic value of HPC-based distributed systems and discuss disruptive technologies and innovations most likely to overturn today’s internet computing landscape. A record of the panel discussion was not made available for publication as part of the conference proceedings.

关键词： Internet of Things Turning Cloud computing Reliability Security Power demand

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Information flow in a purpose-oriented access control model

Information flow in a purpose-oriented access control model

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International conference on parallel and distributed Systems (ICPADS)

作者： M. Yasuda T. Tachikawa K. Takizawa Department of Computers and Systems Engineering Tokyo Denki University Japan

In distributed applications, a group of multiple objects are cooperating to achieve some objectives. An object is modeled as a pair of data structures and operations. Each object is manipulated through an operation supported by the object and then the operation may further invoke operations of other objects, i.e., nested operations. The purpose-oriented access rules indicate which operation on each object can invoke operations of other objects. The information flow among the objects occur if the requests and responses of the operations carry some data. Only the purpose-oriented access rules which imply the legal information flow are allowed. We discuss how to test the access rules if the information flow occurring in the nested invocation of the operations is legal.

关键词： Access control Law Legal factors Information security Data structures distributed computing Systems engineering and theory Application software System testing Client-server systems

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Fast reductions on a network of workstations

Fast reductions on a network of workstations

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International conference on High Performance computing

作者： S. Srinivasan M. Lyell J. Wehrwein P.F. Reynolds Mystech Associates Inc. Falls Church VA USA Department of Computer Science University of Virginia Charlottesville VA USA

Reduction operations are very useful in parallel and distributed computing, with applications in barrier synchronization, distributed snapshots, termination detection, global virtual time computation, etc. In the context of parallel discrete event simulations, we have previously introduced a class of adaptive synchronization algorithms based on fast reductions. We explore the implementation of fast reductions on a popular high performance computing platform-a network of workstations. The specific platform is a set of Pentium Pro PC's running the Linux operating system interconnected by Myrinet-a Gbps network. The general reduction model on which our synchronization algorithms are based is introduced first, followed by a description of how this model can be implemented. We discuss several design trade offs that must be made in order to achieve the driving goal of high speed reductions and provide innovative algorithms to meet the correctness and performance requirements of the reduction model.

关键词： Workstations Discrete event simulation distributed computing Concurrent computing parallel programming Hardware Computer science Test facilities Springs Contracts

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Performance of the r-truncated Benes networks under randomized routing algorithms

Performance of the r-truncated Benes networks under randomiz...

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International conference on parallel and distributed Systems (ICPADS)

作者： H. El-Sayed A. Youssef Department of Electrical Engineering and Computer Science George Washington University Washington D.C. DC USA

Benes networks have the potential for balanced traffic, fewer conflicts, and can route any permutation in one pass due to their multiplicity of paths. Omega networks, on the other hand, have fast set-up and low hardware cost, but could take more than one pass to route a permutation. This paper introduces a new class of networks referred to as r-truncated Benes, which is a Benes network with r randomization stages eliminated. Using randomized routing, we will show that r-truncated Benes networks is an excellent trade-off between Omega and Benes networks. In particular, it will be shown that the I-truncated Benes network out performs Omega and is also superior to Benes and other truncated Benes networks in cost and performance.

关键词： Routing Costs Hardware Multiprocessor interconnection networks parallel algorithms Telecommunication traffic Ambient intelligence parallel processing Computer networks Concurrent computing

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parallel and distributed simulation 14

Parallel and distributed simulation

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Simulation Winter conference

作者： Richard M. Fujimoto School of Computational Science and Engineering Georgia Institute of Technology 266 Ferst Drive Atlanta USA

Driven by the widespread availability of commercial multiprocessor systems and advances in computer networking, the parallel and distributed simulation field emerged and flourished in the late 1970s and 1980s. The field has evolved since that time to address critical issues such as synchronization and interoperability, and remains an active area of research to this day. Many impressive successes have been reported to date. Today, new platforms ranging from massively parallel, heterogeneous supercomputers and cloud computing environments as well as broader technology trends such as big data and the Internet of Things present new challenges and opportunities. This presentation will review work in the parallel and distributed simulation field from seminal research in the 1970s and 80s to important successes that illustrate the potential offered by this technology. Key impediments that have prevented the technology from achieving more widespread adoption by the general modeling and simulation community are discussed as well as important challenges that remain in exploiting new and emerging computing platforms and technology trends.

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ELMO: extending (sequential) languages with migratable objects-compiler support

ELMO: extending (sequential) languages with migratable objec...

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International conference on High Performance computing

作者： R.J. Richards B. Ramkumar S.G. Rathnam Department of Electrical and Computer Engineering University of Iowa Iowa USA

Efficient task migration is an important feature in parallel and distributed programs, in particular to support checkpointing and recovery for fault tolerance. It is also very useful in distributed environments like networks of workstations where external loads are often unpredictable and dynamic in nature. We propose simple language extensions (ELMO) to existing sequential programming languages like C, Fortran or C++, that provide an object based task parallel execution model. Tasks may be dynamically created, are location transparent, and may be migrated or check pointed transparently by the system. ELMO's language features, together with the requisite compiler support is presented.

关键词： Checkpointing Computer networks Concurrent computing Debugging Fault tolerance Workstations Delay parallel programming Runtime Program processors

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Molecular mechanical calculations on parallel and distributed processors

Molecular mechanical calculations on parallel and distribute...

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International conference on High Performance computing in the Asia-Pacific Region

作者： Youngdo Won Department of Chemistry Hanyang University Seoul South Korea

The molecular mechanical potential function is widely used in molecular modeling and simulation research. The most CPU time consuming parts of molecular mechanical potential are the nonbonding interaction terms. An efficient parallel algorithm for nonbonding energy calculation is outlined and its implementation is tested on a variety of parallel and distributed processing elements. As minimal parallel constructs are added, the current implementation does not modify nor slow down the serial algorithm. Load balancing, flexible enough to accommodate local loads of each PE and optimization of list updating procedure are desired and under development.

关键词： Atomic measurements Biological system modeling Bonding Mechanical energy Chemistry parallel algorithms Testing distributed processing Load management Microprocessors

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14th International conference on Dependability of Computer Systems, DepCoS-RELCOMEX 2019

14th International Conference on Dependability of Computer S...

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14th International conference on Dependability of Computer Systems, DepCoS-RELCOMEX 2019

ISBN: (纸本)9783030195007

The proceedings contain 54 papers. The special focus in this conference is on Dependability of Computer Systems. The topics include: Numerical Analysis of the Building Materials Electrical Properties Influence on the Electric Field Intensity;Framework to Verify distributed IoT Solutions for Traffic Analysis in ATN Stations;the Picking Process Model in e-Commerce Industry;evaluation of Design Pattern Utilization and Software Metrics in C# Programs;scheduling Tasks in a System with a Higher Level of Dependability;Comparison of parallel and Non-parallel Approaches in Algorithms for CAD of Complex Systems with Higher Degree of Dependability;Examples of Applications of CAD Methods in the Design of Fault Tolerant Systems;The Concept of the ALMM Solver Knowledge Base Retrieval Using Protégé Environment;graph-Based Vehicle Traffic Modelling for More Efficient Road Lighting;a Fuzzy Approach for Evaluation of Reconfiguration Actions After Unwanted Events in the Railway System;A Comparative Study of Statistical and Neural Network Models for PLC Network Traffic Anomaly Detection;on Some Computational and Security Aspects of the Blom Scheme;registration and Analysis of a Pilot’s Attention Using a Mobile Eyetracking System;minimization Problem Subject to Constraint of Availability in Semi-Markov Reliability Models;method for Railway Timetable Evaluation in Terms of Random Infrastructure Load;representing Process Characteristics to Increase Confidence in Assurance Case Arguments;dependability of Multichannel Communication System with Maintenance Operations for Air Traffic Management;modelling and Safety Assessment of Programmable Platform Based Information and Control Systems Considering Hidden Physical and Design Faults;multi-clustering Used as Neighbourhood Identification Strategy in Recommender Systems.

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High performance computing for direct turbulence simulation in computational fluid dynamics

High performance computing for direct turbulence simulation ...

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International conference on High Performance computing in the Asia-Pacific Region

作者： G. Coussement B. Troff J. Ryan H. Yamazaki M. Yoshida T. Iwamiya Office National d'Etudes et de Recherches Aérospatrales (ONERA) Chatillon France National Aerospace Laboratory Chofu Tokyo Japan

The remarkable advances obtained in prediction and design in computational fluid dynamics (CFD) which requires scalable computing power in terms of speed and memory can currently be sustained with parallel supercomputers. This paper presents cooperative work between ONERA (France) and NAL (Japan) to investigate the potential of distributed environments for high performance computing in CFD. For this purpose a Navier-Stokes flow code was integrated into a distributed processor environment with two parallelization strategies: one based on domain partitioning with message passing; and another one based on loop-parallelization with compiler directives. We present in this paper the results obtained on different computers such as CRAY, PARAGON and NAL NWT supercomputers.

关键词： High performance computing Computational modeling Computational fluid dynamics Supercomputers Collaborative work Message passing Navier-Stokes equations Finite element methods Concurrent computing Protocols

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A concurrency control protocol for parallel B-tree structures without latch-coupling for explosively growing digital content 08

A concurrency control protocol for parallel B-tree structure...

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11th International conference on Extending Database Technology, EDBT 2008

作者： Yoshihara, Tomohiro Kobayashi, Dai Yokota, Haruo Department of Computer Science Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 Japan Global Scientific Information and Computing Center Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8550 Japan Systems Development Laboratory Hitachi Ltd. JSPS

ISBN: (纸本)9781595939265

While shared-nothing parallel infrastructures provide fast processing of explosively growing digital content, managing data efficiently across multiple nodes is important. The value-range partitioning method with parallel B-tree structures in a shared-nothing environment is an efficient approach for handling large amounts of data. To handle large amounts of data, it is also important to provide an efficient concurrency control protocol for the parallel B-tree. Many studies have proposed concurrency control protocols for B-trees, which use latch-coupling. None of these studies has considered that latch-coupling contains a performance bottleneck of sending of messages between processing elements (PEs) in distributed environments because latch-coupling is efficient for a B-tree on a single machine. The only protocol without latch-coupling is the B-link algorithm, but it is difficult to use the B-link algorithm directly on an entire parallel B-tree structure because it is necessary to guarantee the consistency of the side pointers. We propose a new concurrency control protocol named LCFB that requires no latch-coupling in optimistic processes. LCFB reduces the amount of communication between PEs during a B-tree traversal. To detect access path errors in the LCFB protocol caused by removal of latch-coupling, we assign boundary values to each index page. Because a page split may cause page deletion in a Fat-Btree, we also propose an effective method for handling page deletions without latch-coupling. We then combine LCFB with the B-link algorithm within each PE to reduce the cost of Structure Modification Operations (SMOs) in a PE, as a solution to the difficulty of consistency management for the side pointers in a parallel B-tree structure. To compare the performance of the proposed protocol with conventional protocols MARK-OPT, INC-OPT, and ARIES/IM, we implemented them on an autonomous disk system with a Fat-Btree structure. Experimental results in various environments

关键词： Network protocols

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