Hans van Staveren

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Most modern network protocols give adequate support for traditional applications such as file transfer and remote login. Distributed applications, however, have different requirements (e.g., efficient at-most-once remote procedure call even in the face of processor failures). Instead of using ad hoc protocols to meet each of the new requirements, we have(More)
A description is given of the Amoeba distributed operating system, which appears to users as a centralized system but has the speed, fault tolerance, security safeguards, and flexibility required for the 1990s. The Amoeba software is based on objects. Objects are managed by server processes and named using capabilities chosen randomly from a sparse name(More)
The Amsterdam Compiler Kit is an integrated collection of programs designed to simplify the task of producing portable (cross) compilers and interpreters. Fore ach language to be compiled, a program (called a front end) must be written to translate the source program into a common intermediate code. This intermediate code can be optimized and then either(More)
Many portable compilers generate an intermediate code that is subsequently translated into the target machine's assembly language. In this paper a stack-machine-based intermediate code suitable for algebraic languages (e.g., PASCAL, C, FORTRAN) and most byte-addressed mini-and microcomputers is described. A table-driven peephole optimizer that improves this(More)
Remote Procedure Call (RPC) is a widely used communication mechanism in local network based distributed operating systems. It is simple , fast, and straightforward to implement. However, when two or more distant distributed systems are connected, problems arise concerning the protocols, locating services, and other issues. To solve these problems, gateways(More)
The Amoeba project is a research effort aimed at understanding how to connect multiple computers in a seamless way [16, 17, 26, 27, 31]. The basic idea is to provide the users with the illusion of a single powerful timesharing system, when, in fact, the system is implemented on a collection of machines, potentially distributed among several countries. This(More)
Distributed operating systems have been in the experimental stage for a number of years now, but few have progressed to the point of actually being used in a production environment. It is our belief that the reason lies primarily with the performance of these systems---they tend to be fairly slow compared to traditional single computer systems. The Amoeba(More)
SUMMARY 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(More)
UNIX has been around now for almost 20 years. At the time UNIX began, most departments felt themselves well-endowed indeed if they owned a single PDP-11/45 with 256K memory and a 2.5M RK05 disk. Nowadays a laptop would be embarrassed to have only that. It is our hypothesis that UNIX is no longer the appropriate kind of operating system for the 1990s. In(More)