Although the Unix I/O facility is simple and versatile, application programs running under Unix typically do not use its I/O system calls directly. Instead, they use higher level facilities implemented by the programm...
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Although the Unix I/O facility is simple and versatile, application programs running under Unix typically do not use its I/O system calls directly. Instead, they use higher level facilities implemented by the programming language or its application-level libraries. Using application-level I/O facilities improves functionality and portability and can also significantly improve application performance. This articles introduces a new application-level I/O facility called the Alloc Stream Facility. ASF addresses recent computing substrate changes to improve performance, allowing applications to benefit from specific features such as mapped files. It's also designed for parallel systems, maximizing concurrency and reporting errors properly. Because it's modular and objectoriented, it supports a variety of popular existing I/O interfaces and can be tuned to a system's behavior, exploiting its strengths while avoiding its weaknesses. The authors' experiments demonstrate that on a number of standard Unix systems, I/O-intensive applications perform substantially better when linked to ASF instead of the facilities provided - in the best case, up to twice as well. Modifying the applications to use a new interface provided with ASF can improve performance even more.
A problem of synthesis of optimal configuration of spatial objects have been considered. The analysis of models, methods and trends of the development of informatization tools for structural synthesis of complex spati...
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ISBN:
(纸本)9781538664650
A problem of synthesis of optimal configuration of spatial objects have been considered. The analysis of models, methods and trends of the development of informatization tools for structural synthesis of complex spatial objects is carried out. Approaches to the development of new information technologies for solving problems on the basis of their generalized information-analytical model are proposed. A hierarchy of classes is formed for processing, transformation and adaptation of data for the synthesis of optimal configurations of spatial objects. The data is converted into an object-oriented structure in order to visualize the synthesized configurations. Consolidated data storage structure is proposed.
A problem of synthesis of optimal configuration of spatial objects have been considered. The analysis of models, methods and trends of the development of informatization tools for structural synthesis of complex spati...
详细信息
A problem of synthesis of optimal configuration of spatial objects have been considered. The analysis of models, methods and trends of the development of informatization tools for structural synthesis of complex spatial objects is carried out. Approaches to the development of new information technologies for solving problems on the basis of their generalized information-analytical model are proposed. A hierarchy of classes is formed for processing, transformation and adaptation of data for the synthesis of optimal configurations of spatial objects. The data is converted into an object-oriented structure in order to visualize the synthesized configurations. Consolidated data storage structure is proposed.
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