A real-time virtual machine for task placement in loosely-coupled computer systems

The possibilities of increasing the likelihood of timely service and reducing the average waiting time for requests for inter-machine exchange in distributed real-time computer systems are investigated. The analyzed effect is achieved as a result of redundant multi-way transmissions of packets that are critical to delays, which provide for the replication of transmitted packets with the task for each replica of the path (route) of the sequential passage of network nodes. The condition for the timeliness of the reserved transmissions is that the accumulated waiting in the queues of the nodes making up the path, at least for one of the replicas, does not exceed the maximum permissible time. An analytical model is proposed for estimating the average delays of multi-path redundant transmissions, when determined by the average delivery time of the first of the replicas transmitted in different ways. For requests critical to service delays, the influence of the frequency of reservation (replication) of requests on the probability of their timely service and the average waiting time accumulated at the nodes of the path for the replica delivered first was analyzed.

Download Full-text

Service Discovery Framework for Distributed Embedded Real-Time Systems

Advances in Systems Analysis, Software Engineering, and High Performance Computing - Handbook of Research on Emerging Advancements and Technologies in Software Engineering ◽

10.4018/978-1-4666-6026-7.ch007 ◽

2014 ◽

pp. 126-147 ◽

Cited By ~ 1

Author(s):

Furkh Zeshan ◽

Radziah Mohamad ◽

Mohammad Nazir Ahmad

Keyword(s):

Web Services ◽

Real Time ◽

Context Awareness ◽

Service Discovery ◽

Low Cost ◽

High Volume ◽

Heterogeneous Environments ◽

Real Time Systems ◽

Loosely Coupled ◽

Time Systems

Embedded systems are supporting the trend of moving away from centralised, high-cost products towards low-cost and high-volume products; yet, the non-functional constraints and the device heterogeneity can lead to system complexity. In this regard, Service-Oriented Architecture (SOA) is the best methodology for developing a loosely coupled, dynamic, flexible, distributed, and cost-effective application. SOA relies heavily on services, and the Semantic Web, as the advanced form of the Web, handles the application complexity and heterogeneity with the help of ontology. With an ever-increasing number of similar Web services in UDDI, a functional description of Web services is not sufficient for the discovery process. It is also difficult to rank the similar services based on their functionality. Therefore, the Quality of Service (QoS) description of Web services plays an important role in ranking services within many similar functional services. Context-awareness has been widely studied in embedded and real-time systems and can also play an important role in service ranking as an additional set of criteria. In addition, it can enhance human-computer interaction with the help of ontologies in distributed and heterogeneous environments. In order to address the issues involved in ranking similar services based on the QoS and context-awareness, the authors propose a service discovery framework for distributed embedded real-time systems in this chapter. The proposed framework considers user priorities, QoS, and the context-awareness to enable the user to select the best service among many functional similar services.

Download Full-text

Interactive IR in OPAC Environments

Interactive Information Retrieval in Digital Environments ◽

10.4018/978-1-59904-240-4.ch002 ◽

2008 ◽

pp. 29-52

Author(s):

Iris Xie

Keyword(s):

Real Time ◽

Computer Technology ◽

Computer Systems ◽

Relevant Information ◽

University Libraries ◽

Retrieval Systems ◽

Interactive Retrieval ◽

Online Catalogs ◽

Computer Based ◽

The 1960S

Online catalogs are types of interactive computer systems; they can also be called “interactive catalogs” because a user interacts with the computer to find relevant information. The interaction is the main difference between Online Public Access Catalogs (OPACs) and other types of library catalogs (Hildreth, 1982; Matthews, 1985). Online catalogs are regarded as real-time interactive retrieval systems for libraries (Fayen, 1983). According to Peters (1991), the development of online catalogs can be characterized by three decades of development. In the 1960s, the development of online catalogs was led by the development of computer technology and the library community’s desire to increase efficiency in finding library materials. In the 1970s, commercial vendors started to replace large university libraries as the principal developers of computer-based library systems. In the 1980s, local libraries expand their control of the library catalog systems.

Download Full-text

Achieving Consistent Real-Time Latency at Scale in a Commodity Virtual Machine Environment Through Socket Outsourcing-Based Network Stacks

IEEE Access ◽

10.1109/access.2018.2877296 ◽

2018 ◽

Vol 6 ◽

pp. 69961-69977 ◽

Cited By ~ 1

Author(s):

Oscar F. Garcia ◽

Yasushi Shinjo ◽

Calton Pu

Keyword(s):

Real Time ◽

Virtual Machine ◽

Time Latency

Download Full-text