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Object Oriented Programming (OOP) is currently being hyped as the best way to do everything from promoting code reuse to forming lasting relationships with persons of your preferred sexual orientation. This paper tries to demystify the benefits of OOP. ...

We present a tool, called sif, for finding all similar files in a large file system. Files are considered similar if they have significant number of common pieces, even if they are very different otherwise. For example, one file may be contained, ...

cql is a UNIX system tool that applies C style query expressions to flat file databases. In some respects it is yet another addition to the toolbox of programmable file filters: grep [Hume88], sh [Bour78] [BK89], awk [AKW88], and perl [Wall]. However, ...

GLIMPSE, which stands for GLobal IMPlicit SEarch, provides indexing and query schemes for file systems. The novelty of glimpse is that it uses a very small index - in most cases 2-4% of the size of the text - and still allows very flexible full-text ...

News transport and spooling systems of the last several years have concentrated on decreasing the resource load on news servers. One beneficial side effect has been the average decrease in time that a news system spends on a given article. This paper ...

Refdbms is a database system for sharing bibliographic references among many users at sites on a wide-area network such as the Internet. This paper describes our experiences in building and using refdbms for the last two years. It summarizes the ...

As the Net burgeons, new tools and protocols are being introduced to permit some orderly use to be made of the wealth of information available. These new protocols, however, often presuppose the use of new, nonstandard, highly interactive user ...

Concert/C is a new language for distributed C programming that extends ANSI C to support distribution and process dynamics. Concert/C provides the ability to create and terminate processes, connect them together, and communicate among them. It supports ...

We have modified Mach 3.0 to treat cross-domain remote procedure call (RPC) as a single entity, instead of a sequence of message passing operations. With RPC thus elevated, we improved the transfer of control during RPC by changing the thread model. ...

TreadMarks is a distributed shared memory (DSM) system for standard Unix systems such as SunOS and Ultrix. This paper presents a performance evaluation of TreadMarks running on Ultrix using DECstation-5000/240's that are connected by a 100-Mbps switch-...

We show how multimedia applications with real-time requirements can be supported in a distributed system. A UNIX system has been modified to give soft real-time support. The modifications include deadline-based scheduling, preemption points and ...

This paper describes the implementation of an ATM protocol stack as a protocol family within a 4.3 BSD derived Unix. A novel approach to the implementation of the management and control functions for the ATM protocol stack has been adopted. The data ...

This paper describes a new packet filter mechanism that efficiently dispatches incoming network packets to one of multiple endpoints, for example address spaces. Earlier packet filter systems iteratively applied each installed filter against every ...

In this paper we characterize the latency of the BSD 4.4 alpha implementation of TCP on an ATM network. Latency reduction is a difficult task, and careful analysis is the first step towards reduction. We investigate the impact of both the network ...

Several studies have shown that operating system performance has lagged behind improvements in application performance. In this paper we show how operating systems can be improved to make better use of RISC architectures, particularly in some of the ...

We used memory reference traces from a DEC Ultrix system running the X11 window system from MIT Project Athena and several freely available X11 applications to measure different aspects of memory system behavior and performance. Our measurements show ...

The Spring operating system provides a uniform name service that can be used to associate any name with any object independent of the type of object, and allows arbitrary name spaces to be created and used as first-class objects. We have used this name ...

A hybrid of window system, shell, and editor, Acme gives text-oriented applications a clean, expressive, and consistent style of interaction. Traditional window systems support interactive client programs and offer libraries of pre-defined operations ...

Network Appliance Corporation recently began shipping a new kind of network server called an NFS file server appliance, which is a dedicated server whose sole function is to provide NFS file service. The file system requirements for an NFS appliance are ...

The Network File System (NFS) utilizes a stateless protocol between clients and servers; the major advantage of this statelessness is that NFS crash recovery is very easy. However, the protocol requires that data modification operations such as write be ...

There are some constraints inherent in the NFS^TM∈ protocol that result in performance limitations for high performance workstation environments. This paper discusses an NFS-like protocol named Not Quite NFS (NQNFS), designed to address some of these ...

With the advent and subsequent popularity of portable computers, power management of system components has become an important issue. Current portable computers implement a number of power reduction techniques to achieve a longer battery life. Included ...

Minimizing power consumption is important for mobile computers, and disks consume a significant portion of system-wide power. There is a large difference in power consumption between a disk that is spinning and one that is not, so systems try to keep ...

The evolution of the Andrew File System (AFS) into a wide-area distributed file system has encouraged collaboration and information dissemination on a much broader scale than ever before. In this paper, we examine AFS as a provider of wide-area file ...

Wux is a port of Unix tools to the Microsoft Windows environment. It is based on a library providing a Unix-compatible set of system calls on top of Windows. Unix-derived tools run in parallel, communicating using the Unix pipe abstraction. All ...

We have written DosFs, a new file system for UNIX that uses MS-DOS data structures for permanent storage. DosFs can be used anywhere a traditional UNIX file system can be used, and it can mount disks written by MS-DOS as regular UNIX partitions. DosFs ...

The NetWare operating system is designed specifically to provide service to clients over a computer network. This design has resulted in a system that differs in several respects from more general-purpose operating systems. In addition to highlighting ...