Association for computing machinery jan 2025 (4 risultati)

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This book describes the development and use of supercomputers in the period 1960 - 1996, a time that can be called the Seymour Cray Era. For more than three decades, Cray's computer designs were seen as the yardstick against which all other efforts were measured. Initially, this yardstick was sheer computing speed. However, the supercomputer world gradually became more complex and other factors became equally important.The initial development of supercomputers was commissioned and financed by the Los Alamos and Lawrence Livermore National Laboratories, which had huge computational needs in connection with nuclear weapons development. The computers designed by Cray satisfied those needs, while these computers were also sold to a few dozen other big research organizations and weather agencies. From the 98 s, a variety of companies started to compete with the Cray designs by offering supercomputers that used a new architectural approach, MPP: massively parallel processing. This new architecture, based on using tens of thousands of relatively simple microprocessors, subsequently began to dominate high-performance computing and marked the end of the Seymour Cray Era.This book is important reading for anyone working in the area of high-performance computing, providing essential historical context for the work of a legendary pioneer and the computers he became famous for designing. It will also be valuable to students of computing history and, more generally, to readers interested in the history of science and technology. For advanced students, the book illustrates how innovation in its very essence is a socio-technical process: not just a matter of developing the 'best technology,' but also of making appropriate choices concerning the interaction of human and technical factors in product design. 282 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This book outlines a methodology to develop formally verified Just-in-Time compilers. Just-in-Time compilation is a technique to execute programs, where execution is interleaved with optimizations of the program itself. These compilers often produce fast executions, so much so that their use has grown greatly for dynamic programming languages. Most modern web browsers today use Just-in-Time compilation to speed up the execution of the JavaScript programs they execute.However, the techniques used in Just-in-Time compilers can be particularly complex. This complexity can be a source of bugs and vulnerabilities. How can you make sure that your Just-in-Time compiler is bug-free For traditional ahead-of-time compilers, many techniques have been developed to prevent compilation bugs. One such technique is formally verified compilation, where the compiler itself comes with proof that the semantics of the compiled program correspond to the semantics of the source program. But Just-in-Time compilers are more recent, less understood, and have been the target of far fewer verification efforts.To bring formal verification to Just-in-Time compilation, the book identifies a set of specific verification challenges and presents novel solutions for each of them. Such challenges include dynamic optimizations, speculative optimizations, deoptimizations, and the interleaving of interpretation and machine code generation. The author repurposes proof techniques from formally verified ahead-of-time compilers like CompCert. Following this methodology, readers can develop Just-in-Time compilers and formally prove that they behave as prescribed by the semantics of the program they execute. All proofs within the book have been mechanized in the Coq proof assistant. 176 pp. Englisch.…

Buch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This book describes the development and use of supercomputers in the period 1960 - 1996, a time that can be called the Seymour Cray Era. For more than three decades, Cray's computer designs were seen as the yardstick against which all other efforts were measured. Initially, this yardstick was sheer computing speed. However, the supercomputer world gradually became more complex and other factors became equally important.The initial development of supercomputers was commissioned and financed by the Los Alamos and Lawrence Livermore National Laboratories, which had huge computational needs in connection with nuclear weapons development. The computers designed by Cray satisfied those needs, while these computers were also sold to a few dozen other big research organizations and weather agencies. From the 98 s, a variety of companies started to compete with the Cray designs by offering supercomputers that used a new architectural approach, MPP: massively parallel processing. This new architecture, based on using tens of thousands of relatively simple microprocessors, subsequently began to dominate high-performance computing and marked the end of the Seymour Cray Era.This book is important reading for anyone working in the area of high-performance computing, providing essential historical context for the work of a legendary pioneer and the computers he became famous for designing. It will also be valuable to students of computing history and, more generally, to readers interested in the history of science and technology. For advanced students, the book illustrates how innovation in its very essence is a socio-technical process: not just a matter of developing the 'best technology,' but also of making appropriate choices concerning the interaction of human and technical factors in product design. 282 pp. Englisch.…

Buch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This book outlines a methodology to develop formally verified Just-in-Time compilers. Just-in-Time compilation is a technique to execute programs, where execution is interleaved with optimizations of the program itself. These compilers often produce fast executions, so much so that their use has grown greatly for dynamic programming languages. Most modern web browsers today use Just-in-Time compilation to speed up the execution of the JavaScript programs they execute. However, the techniques used in Just-in-Time compilers can be particularly complex. This complexity can be a source of bugs and vulnerabilities. How can you make sure that your Just-in-Time compiler is bug-free For traditional ahead-of-time compilers, many techniques have been developed to prevent compilation bugs. One such technique is formally verified compilation, where the compiler itself comes with proof that the semantics of the compiled program correspond to the semantics of the source program. But Just-in-Time compilers are more recent, less understood, and have been the target of far fewer verification efforts. To bring formal verification to Just-in-Time compilation, the book identifies a set of specific verification challenges and presents novel solutions for each of them. Such challenges include dynamic optimizations, speculative optimizations, deoptimizations, and the interleaving of interpretation and machine code generation. The author repurposes proof techniques from formally verified ahead-of-time compilers like CompCert. Following this methodology, readers can develop Just-in-Time compilers and formally prove that they behave as prescribed by the semantics of the program they execute. All proofs within the book have been mechanized in the Coq proof assistant. 176 pp. Englisch.…