In this paper, we give an overview of the results of the CRAFT optimising compiler project (Fortran 90/HPF subset compilers). We start by describing the theoretical framework within which we designed program transformations for the optimization of inter- and intra-procedural data motion, as well as the optimizations for parallel loops; we then describe the implementation of the CRAFT compilers for Thinking Machines' CM-2 and CM-5. We report results from experiments on the Connection Machine CM-5, the IBM SP-2 and a network of UltraSparc workstations. The results demonstrate that these optimizations can achieve significant object code performance improvement. Copyright © 1999 John Wiley & Sons, Ltd.

A useful discrete-event simulation environment should support component-level reuse, integration of graphical tools, and scalable performance. The JTED framework (http://www.cooperate.com/JTED) demonstrates that Java can serve as the basis for constructing very large models that achieve these goals. © 1998 John Wiley & Sons, Ltd.

In this paper, we sketch some techniques for using Java to improve the state-of-the-art in scalable collaboration management for scientific and engineering applications. We argue that flexibility, cost containment and support for large-scale collaboration must join raw performance as metrics for successful, scalable HPC software. Finally, we summarize our experience with large-scale Web-based collaboration, and describe some plans for future work. © 1997 John Wiley & Sons, Ltd.

Massively parallel architectures, and the languages used to program them, are among both the most difficult and the most rapidly-changing subjects for compilation. This has created a demand for new compiler prototyping technologies that allow novel styles of compilation and optimization to be tested in a reasonable amount of time. Using formal specification techniques, we have produced a data-parallel Fortran-90 subset compiler for Thinking Machines' Connection Machine/2 and Connection Machine/5. The prototype produces code from initial Fortran-90 benchmarks demonstrating sustained performance superior to hand-coded *Lisp and competitive with Thinking Machines' CM Fortran compiler. This paper presents some new specification techniques necessary to construct competitive, easily retargetable prototype compilers. 1 Introduction Existing compilers for massively parallel machines have generally been constructed using traditional methods, combining generation from specification for a few su...

Abstract A technique is presented, based on the method of tries, which allows direct access to variable‐length records in a sequential file. No reorganization of the original file is involved.