Layered distributed operating system

The improved efficiency of microelectronics and the development of digital transmission systems have allowed experimentation with distributed computing architectures. The requirements of a distributed operating system are outlined, and the principles and architecture used in the system are explained. A method is described of managing the system directories, and an analysis is given of the results obtained.     

The Galaxy distributed operating system

The Galaxy research project, which is attempting to design, implement, and use a distributed computing environment, based on the idea of making gradual improvements by learning from existing systems and trying to overcome their limitations, is described. The design goals and novel aspects of the project are outlined, and the Galaxy system architecture is described. Galaxy's object naming and locating mechanisms, interprocess communication, and computation model are discussed     

The Clouds distributed operating system

The authors discuss a paradigm for structuring distributed operating systems, the potential and implications this paradigm has for users, and research directions for the future. They describe Clouds, a general-purpose operating system for distributed environments. It is based on an object-thread model adapted from object-oriented programming     

A distributed real-time operating system

Two versions of the HARTS operating system, which is based on Software Components Group's pSOS uniprocessor kernel, are presented. In one version, pSOS services are enhanced to provide interprocessor communication and a distributed naming service. In the second version, real-time fault-tolerant communication, including reliable broadcasting, clock synchronization, and group communication are added to the HARTS operating system. Three tools to evaluate the performance and fault tolerance dependability of HARTS hardware and software-a synthetic-workload generator, a monitor, and a fault injector-are described. The generator produces a synthetic workload, the monitor collects the performance data, and the fault injector simulates faulty behavior for further study. Together these tools create a facility that lets the user perform a wide range of experiments. The tools are independent, so they are equally effective separately or together, depending on the requirements     

The THUDSOS Distributed Operating System

The THUDSOS is a distributed operating system modeled as an abstract machine which provides decentralized control,transparency,availability,and reliability,as welol as a good degree of autonomy at each node,that makes our distributed system usable.Our operating system supports transparent access to data through network wide filesystem.The simultaneous access to any device is discussed for the case when the peripherals are treated as files.This operating system allows spawning of parallel application programs to solve problems in the fields,such as numerical analysis and artificial intelligence.     

Configuration management in the Nexus distributed operating system

The paper describes the approach taken for configuration management in the Nexus distributed operating system. Nexus uses kernel-level support for monitoring the failure or termination status of distributed components of an application. Periodic user-level messages are not required for status monitoring. Group and dependency relationships between such components can be defined by the programmer for the purpose of configuration monitoring and management. An object belonging to a distributed application can be monitored by its host kernel for system-defined exception conditions. When any of these conditions arise, other objects are notified through signals or messages, as specified by the programmer.     

Dawning-1000 PROOS Distributed Operating System

PROOS is a distributed operating system running on the computing nodes of massively parallel processing computer Dawning-1000.It is an efficient and easily extendible micro kernel operating system.It supports the Intel NX message passing interface for communication.     

The performance of the Amoeba distributed operating system

Amoeba is a capability-based distributed operating system designed for high-performance interactions between clients and servers using the well-known RPC model. The paper starts out by describing the architecture of the Amoeba system, which is typified by specialized components such as workstations, several services, a processor pool, and gateways that connect other Amoeba systems transparently over wide-area networks. Next the RPC interface is described. The paper presents performance measurements of the Amoeba RPC on unloaded and loaded systems. The time to perform the simplest RPC between two user processes has been measured to be 1-4 ms. Compared to SUN 3/50's RPC, Amoeba has one ninth of the delay, and over three times the throughput. Finally we describe the Amoeba file server. The Amoeba file server is so fast that it is limited by the communication bandwidth. To the best of our knowledge this is the fastest file server yet reported in the literature for this class of hardware.     

PEACE: The distributed SUPRENUM operating system

This paper describes the fundamental concepts and structure of the distributed operating system, PEACE, for SUPRENUM. A large scale of distribution is achieved because of consequently encapsulating typical operating system services by processes. By this way an optimal and application-oriented mapping of the entire operating system onto the distributed SUPRENUM architecture is made feasible.     

Mos: A multicomputer distributed operating system

This paper describes the goals and the internal structure of MOS, a Multicomputer distributed Operating System. MOS is a general-purpose time-sharing operating system which makes a cluster of loosely connected independent homogeneous computers behave as a single-machine UNIX system. The main goals of the system include network transparency, decentralized control, site autonomy and dynamic process migration. The main objective in the design of the system was to reduce the complexity of the system, while maintaining good performance. The internal structure of the system can be characterized by modularity, a high degree of information hiding, hierarchical organization and remote procedure calls.     

An overview of the Nexus distributed operating system design

Nexus is a distributed operating system designed to support experimental research in fault-tolerance techniques and object-oriented programming in distributed systems. The Nexus programming environment consists of objects, which are instances of abstract data types. Inheritance of types and multiple implementations for a type are supported by the system. Operations on objects are invoked, based on the remote-procedure-call paradigm and executed as atomic actions with provisions for application-controlled checkpointing and restart within actions. Nexus also supports parallel remote procedure calls. Interobject communication and location transparency in accessing objects is supported by the Nexus kernel     

海量小文件系统的可移植操作系统接口兼容技术

基于Hadoop分布式文件系统（HDFS）研发的海量小文件系统（SMDFS）遗留了HDFS不兼容可移植操作系统接口（POSIX）约束的问题,为解决SMDFS的这一问题,提出基于本地缓存的POSIX兼容技术和基于数据暂存区的元数据高效管理技术。首先,通过设置数据暂存区来实现读写模式文件流的重定向,然后建立异步线程池模型,实现数据暂存区镜像文件的同步,从而完成用户层到存储层的所有POSIX相关的文件操作。此外,借助跳表结构的元数据缓存实现List目录等元数据操作效率优化。测试表明,相较于HDFS的Linux客户端,基于技术成果实现的SMDFS3.0的随机读性能有10倍以上的性能提升,顺序读和顺序写性能有约3~4倍的提升,随机写性能可以达到本地文件系统的20%,基于目录的元数据缓存的设计使目录的List操作效率提升近10倍。但是,由于用户空间文件系统（FUSE）挂载的客户端会引入额外的内核态和用户态切换等带来的开销,因此SMDFS3.0的Linux客户端相对于系统的Java接口会有大约50%的性能损耗。     

The Design and Implementation of an OA System ZGL1

ZGLI,an office automation system for municipal administration,is presented.It is a distributedmicrocomputer system based on OMNINET.Each node of it is an IBM PC/XT microcomputer with Chinesecharacter facilities.The system consists of a distributed database management system,a Chinese characterelectronic mail system,a Chinese word processor and others.Its functions include document management,report form management,research project management,finance management and information access.     

A Mechanism Supporting the Client/Server Relationship in the Operating System of Distributed System “THUDS”

This paper presents a distributed operating system modeled as an abstract machine that provides all the distributed processes with the same set of services.The kernel of our operating system supports services which are achieved by a remote procedure call on requests by parallel processes.Therefore,a scheme for solving the client-server relationship is required.In our system there are more than one clients and,at least,a receive would be required for each.Similarly,there are more than one servers such that the send in a client should produce a message that can be received by every server.Consequently,a mechanism well suited for programming multiple-clients/single-server and single-client/multiple-servers interactions is proposed.     

分布式实时操作系统消息机制的设计与实现

随着数字信号处理技术的迅猛发展,针对并行数字信号处理(DSP)应用自主开发了一个满足用户需要的高性能分布式实时操作系统--腾飞分布式实时操作系统(TF-RTOS).消息机制用于线程间的通信,是操作系统中的重要部分.在开发TF-RTOS过程中,从消息命令包、消息队列、消息传递过程和消息原语这4个方面设计并实现了一种直接消息传递的消息机制,该消息机制具有简化线程间通信、增强系统功能、提高系统性能的特点.     

DEMOS/MP: The development of a distributed operating system

The DEMOS/MP operating system has moved from a supercomputer with a simple addressing structure to a network of microcomputers. This transformation was done without significant changes to the semantics of the original DEMOS, i.e. existing DEMOS programs should run on DEMOS/MP. The changes to DEMOS were simplified by the structure of its primitive objects and the functions over those objects. The structure of DEMOS links and processes were the major contributors to the simplicity. The changes made to produce DEMOS/MP involved the internal structure of link, modification to parts of the kernel, and limited changes to the various system processes.     

基于志愿者计算的高性能分布式作业系统及其优化

为提高分布式作业系统的性能,提出了基于志愿者计算的方法.对分布式作业系统中的任务服务器进行设计,通过提高任务服务器的分发能力,提升了作业系统整体的计算能力,实例仿真计算表明,当任务服务器的数量增加时,采用基于志愿者的分布式作业系统能够大大提高任务服务器处理任务的能力,同时如果对数据库查询进行优化,可以进一步提高分布式作业系统的性能.     

The performance of a distributed combat simulation with the time warp operating system

This paper analyzes the performance of a discrete-event combat simulation executed on a parallel processor under control of the Time Warp Operating System. Time Warp is in a class of distributed simulation methods called Optimistic methods which have proven to be useful over a wide range of simulations. The combat simulation used for this performance study, called STB88, is a division-corps model incorporating a number of different types of computations. The speed-up for three versions of this model on the Caltech/JPL Mark III Hypercube and the BBN Butterfly parallel processors was measured relative to an efficient sequential execution of the same model on the same hardware. The results indicate that STB88 version 1 achieves a speed-up of 28.6 on 60 Mark III processors, while STB88 version 2 achieves a speed-up of 36.8 on 100 Butterfly processors. Version 3 of STB88 achieved a speed-up of 38.5 on 128 Mark III processors. The versions differed only in their interface to Time Warp. On the Butterfly, the sequential execution completed in 2 hours, while the 100 processor execution completed in 3.2 minutes.