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The Distributed ASCI Supercomputer (DAS) is a homogeneous wide-area distributed system consisting of four cluster computers at different locations. DAS has been used for research on communication software, parallel languages and programming systems, schedulers, parallel applications, and distributed applications. The paper gives a preview of the most(More)
Orca is a portable, object-based distributed shared memory (DSM) system. This article studies and evaluates the design choices made in the Orca system and compares Orca with other DSMs. The article gives a quantitative analysis of Orca's coherence protocol (based on write-updates with function shipping), the totally ordered group communication protocol, the(More)
Panda is a virtual machine designed to support portable implementations of parallel programming systems. It provides communication primitives and thread support to higher-level layers (such as a runtime system). We have used Panda to implement four parallel programming systems: Orca, data parallel Orca, PVM, and SR. The paper describes our experiences in(More)
Clusters of workstations are often claimed to be a good platform for parallel processing, especially if a fast network is used to interconnect the workstations. Indeed, high performance can be obtained for low-level message passing primitives on modern networks like ATM and Myrinet. Most application programmers, however, want to use higherlevel(More)
This work was carried out in graduate school ASCI. ASCI dissertation series number 52. Preface Personal Acknowledgements First and foremost, I am grateful to my thesis supervisors, Henri Bal and Andy Tanenbaum, for creating an outstanding research environment. I thank them both for their confidence in me and my work. I am very grateful to all members, past(More)
We systematically evaluate the performance of five implementations of a single, user-level communication interface. Each implementation makes different architectural assumptions about the reliability of the network hardware and the capabilities of the network interface. The implementations differ accordingly in their division of protocol tasks between host(More)