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22nd IEEE international symposium on real-time distributed computing (ISORC)

作者： Maroulis, Stathis Zacheilas, Nikos Theocharis, Thanasis Kalogeraki, Vana Athens Univ Econ & Business Dept Informat Athens Greece

ISBN: (纸本)9781728101514

In recent years we observe a rapid growth in the deployment of machine learning workloads on big data analytics frameworks like Apache Spark and Apache Flink. These workloads are typically represented as graphs, run on shared infrastructures and often have much more demanding resource requirements than those traditionally found in typical enterprise settings. However, predicting the execution times of the workloads is important as they often run on shared public or private infrastructures and, thus, their execution is greatly affected by the resource sharing, the hardware infrastructure utilized as well as the choice of the configuration parameters provided by the frameworks. In this work, we propose a fast and efficient performance prediction system to address the challenge of predicting the execution times of big data workloads, exploiting the fact that workloads are represented as processing graphs and often share similar structures and parameters. Thus, we can use the performance models we have built for already deployed workloads, to estimate the end-to-end execution time for a new workload. Previous works assume that a large number of profiling runs can be utilized for building the prediction models. However, this assumption is not always valid and more elaborate mechanisms need to be applied. Our detailed experimental evaluation on our local Spark cluster illustrates that our approach can predict accurately the execution time of a wide range of Spark workloads.

关键词： Graph Similarity Predictions distributed Systems

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Supporting the analyst when reasoning on requirements specifications for real-time and distributed systems 1

Supporting the analyst when reasoning on requirements specif...

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1st international symposium on object-oriented real-time distributed computing (ISORC 98)

作者： Zeippen, JM Dubois, E Du Bois, P Univ Namur Dept Comp Sci CEDITI FUNDP B-6041 Gosselies Belgium

ISBN: (纸本)0818684321

Formal methods are being advocated for the design of complex software systems, like real-time and distributed systems: they provide clear semantics and allow (possibly automated) calculations to deduce properties from a system description. In practice, especially for requirements specification languages, formally analysing such descriptions may not be easily achievable. We sketch a toolset for assisting the analyst in his/her task of analysing a requirements specification. The basic idea of the approach is to provide automated and intuitive support for exploring the specifications and gaining an initial understanding of them before it is possible to reason formally about them (if it really pays-off as, in the exploration process, errors may already be uncovered).

关键词： Semantics

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Measuring and optimizing CORBA latency and scalability over high-speed networks

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IEEE TRANSACTIONS ON COMPUTERS 1998年第4期47卷 391-413页

作者： Gokhale, AS Schmidt, DC Washington Univ Dept Comp Sci St Louis MO 63130 USA

There is increasing demand to extend object-oriented middleware, such as OMG CORBA, to support applications with stringent quality of service (QoS) requirements. However, conventional CORBA object Request Broker (ORB) implementations incur high latency and low scalability when used for performance-sensitive applications. These inefficiencies discourage developers from using CORBA for mission/life-critical applications such as real-time avionics, telecom call processing, and medical imaging. This paper provides two contributions to the research on CORBA performance. First, we systematically analyze the latency and scalability of two widely used CORBA ORBs, VisiBroker and Orbix. These results reveal key sources of overhead in conventional ORBs. Second, we describe techniques used to improve latency and scalability in TAO, which is a high-performance, real-time implementation of CORBA. Although conventional ORBs do not yet provide adequate QoS guarantees to applications, our research results indicate ii is possible to implement ORBs that can support high-performance, real-time applications.

关键词： distributed object computing CORBA communication middleware performance real-time CORBA

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Principles of constructing a timeliness-guaranteed kernel and time-triggered message-triggered object support mechanisms 1

Principles of constructing a timeliness-guaranteed kernel an...

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1st international symposium on object-oriented real-time distributed computing (ISORC 98)

作者： Kim, KH Subbaraman, C Univ Calif Irvine Dept Elect & Comp Engn Irvine CA 92697 USA

ISBN: (纸本)0818684321

One of the major components required for the construction of future complex real-time computer systems (RTCS's) needed in safety-critical applications is a timeliness-guaranteed operating system. A model of an operating system kernel called the DREAM kernel that can support both conventional real-time processes and new-style real-time objects has been formulated recently. The key emphasis in formulating the DREAM kernel was in the realization of guaranteed timely responses to the service requests from supported client programs. This paper presents a summary of the main structuring principles that were exploited to realize guaranteed timely service capabilities while maintaining the modular and easily expandable structure in the DREAM kernel. Implementation of real-time processes and real-time objects involves designing various calls to DREAM kernel services. A library of functions, called the DREAM library and providing user-friendly interfaces to the DREAM kernel, has been developed in the authors' laboratory. This library consists of a collection of specific C++ classes. A 32-bit prototype version of the DREAM kernel, version D3.0, encapsulated by the DREAM library that supports well-structured real-time application programming in C++ has been implemented. This prototype version has been used in efficient development of several real-time object structured applications including a non-trivial defense C-3 system, a steel factory control system, and an advanced traffic management system.

关键词： real-time operating system object-oriented real-time system time-triggered message-triggered object real-time programming DREAM kernel

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Heterogeneous Task Co-location in Containerized Cloud computing Environments 23

Heterogeneous Task Co-location in Containerized Cloud Comput...

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IEEE 23rd international symposium on real-time distributed computing (ISORC)

作者： Zhong, Zhiheng He, Jiabo Rodriguez, Maria A. Erfani, Sarah Kotagiri, Ramamohanarao Buyya, Rajkumar Univ Melbourne Sch Comp & Informat Syst Cloud Comp & Distributed Syst CLOUDS Lab Melbourne Vic Australia

ISBN: (纸本)9781728169583

Although cloud computing became a mainstream industrial computing paradigm, low resource utilization remains a common problem that most warehouse-scale datacenters suffer from. This leads to a significant waste of hardware resources, infrastructure investment, and energy consumption. As the diversity in application workloads grows into an essential characteristic in modern datacenters, task co-location of different workloads to the same compute cluster has gained immense popularity as a heuristic solution for resource utilization optimization. Although the existing co-location methodologies manage to improve resource efficiency to a certain degree, application QoS is usually sacrificed as a trade-off when dealing with resource interference between different applications. This paper proposes a containerized task co-location (CTCL) scheduler to improve resource utilization and minimize task eviction rate. Our CTCL scheduler (1) applies an elastic task co-location strategy to improve resource utilization;and (2) supports a dynamic task rescheduling mechanism to prevent severe QoS degradation from frequent task evictions. We evaluate our approach in terms of resource efficiency and rescheduling cost through the ContainerCloudSim simulator. Our experiments with the Alibaba 2018 workload traces demonstrate that CTCL could improve overall resource efficiency and reduce rescheduling rate by 38% and 99% respectively.

关键词： Cluster Management Container Orchestration Resource Co-location Resource Heterogeneity Workload Characterization

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Performance evaluation of a fault-tolerant mechanism based on replicated distributed objects for CORBA 4

Performance evaluation of a fault-tolerant mechanism based o...

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4th IEEE international symposium on object-oriented real-time computing (ISORC 2001)

作者： Takemoto, M Nakamura, T NTT Network Innovat Labs Musashino Tokyo Japan

ISBN: (纸本)0769510892

For future applications, it is important to develop Systems using small objects. Such systems must be able to provide uninterrupted services even when some small objects stop. Replicating such objects is one way to do this. However introducing some type of redundancy into systems generally adds some overhead. Our proposed model reduces this overhead. It is implemented with multi-threaded execution for applications in actual systems. We measured the performance of an implementation for applications connected to databases. The results show that the overhead for ordinary execution and the time required to switch the replicas are both acceptably small. This technique will therefore play an important role in future systems.

关键词： Common object request broker architecture (CORBA)

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Lessons learned applying performance modeling and analysis techniques

Lessons learned applying performance modeling and analysis t...

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9th IEEE international symposium on object-oriented real-time distributed computing, ISORC 2006

作者： Street, Julie A. Pettit IV, Robert G. Aerospace Corporation 15049 Conference Center Drive Chantilly VA 20151 United States

ISBN: (纸本)076952561X

This paper provides a series of lessons learned with respect to using performance modeling and analysis techniques on designs of object-oriented software systems. Specifically it focuses on the application of the Unified Modeling Language (UML) Profile for Schedulability Performance, and time (SPT) paired with statistical simulation and coloured Petri nets (CPNs). The experiences captured in this paper are based on observations from an empirical study evaluating these techniques. © 2006 IEEE.

关键词： object oriented programming

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A Document centric Framework for Building distributed Smart object Systems

A Document centric Framework for Building Distributed Smart ...

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IEEE international symposium on object/Component/Service-oriented real-time distributed computing

作者： Kawsar, Fahim Nakajima, Tatsuo Waseda Univ Dept Comp Sci Tokyo Japan

ISBN: (纸本)9780769535739

We present an architectural framework that provides the foundation for building smart object systems and uses a document centric approach utilizing a profile based artefact framework and a task based application framework. Our artefact framework represents an instrumented physical smart objects as a collection of service profiles and expresses these services in generic documents. Applications for smart objects are expressed as a collection of functional tasks (independent of the implementation.) in a corresponding document. A runtime component provides the foundation for mapping these tasks to the corresponding service provider smart objects. There are three primary advantages of our approach- firstly, it allows developers to write applications in a generic way without prior knowledge of the smart objects that could be used by the applications. Secondly;smart object management (locating/accessing/etc.) issues are completely handled by the infrastructure thus application development becomes rapid and simple. Finally;the programming abstraction used in the framework allows extension of functionalities of smart objects and applications very easily. We describe an. implemented prototype of our framework and show examples of its use in a real life scenario to illustrate its feasibility.

关键词： Computer programming

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DOORS: distributed object oriented Runtime System (Position Paper) 16

DOORS: Distributed Object Oriented Runtime System (Position ...

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16th international symposium on Parallel and distributed computing (ISPDC)

作者： Palanciuc, Dorin Univ Politehn Bucuresti Comp Sci Dept Fac Automat Control & Comp Bucharest Romania

ISBN: (纸本)9781538608623

The large software applications of today provide abstractions of the real-life systems that they support. A digital model of the system, and of the changes that occur within, are being maintained and updated, as triggered by real-life events. Morphologically, such applications contain several distinct architectural entities: databases holding the state, central components describing how the system reacts to external events and mechanisms through which the user can view the current state and issue new commands. Each of these entities may use distinct paradigms and employ different technologies. A production-ready software application ends up assembling a relatively high technology stack and provides the final abstractions for both the problem and its solution. In this paper we propose a short-circuit for the long chain of technologies that are usually employed in large, production-ready software applications. The resulting architecture is a distributed, message-based system which behaves as a hybrid between a database and a runtime environment. The system operates with persistent and live entities, encapsulating both state and operations and therefore easily assimilated with OOP classes.

关键词： distributed computing message passing object oriented runtime storage

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Towards an implementation model for FB-based reconfigurable distributed control applications

Towards an implementation model for FB-based reconfigurable ...

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7th IEEE international symposium on object-oriented real-time distributed computing

作者： Thramboulidis, K Doukas, G Frantzis, A Univ Patras Patras 26500 Greece

ISBN: (纸本)076952124X

The Function Block (FB) has been defined by the international Electro-technical Commission (IEC) as the basic construct for the development of reusable, interoperable, distributed control applications. Complete applications can be defined in the design level as networks of interconnected FBs. For these design models to be automatically converted to implementation ones, adopting the model integrated computing paradigm, an appropriate implementation meta-model should be defined. In this paper we describe two alternatives for the implementation of FB design models. The first one adopts the straight forward transformation of the FB design model to a high level language (C++, Java) implementation model. The second approach utilizes UML-RT models as an intermediate representation towards the final implementation model. Both approaches support the dynamic re-configuration of the control application and exploit our extensions to the IEC Execution Control Chart notation, to improve the expressiveness of the design model and the efficiency of the implementation one.

关键词： distributed parameter control systems

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