Interfaces for Parallel and Distributed I/O

PIOUS系统是一个实验性的软件体系结构，用于异构并行和分布式计算环境中的高效数据管理和I/O。PIOUS提供具有标准一致性语义的可扩展并发控制，向应用程序提供并行文件的全局或分段视图，并对物理数据进行去集群以提高性能。 PIOUS中的并发控制是基于事务的，并且允许易变或稳定的文件访问语义，以增加吞吐量或对系统故障的恢复能力。 本项目的目标是在PVM消息传递平台上完成并实现PIOUS原型系统。 该系统将由一个API库组成，该库旨在提供熟悉的文件系统语法和语义，同时允许多个并发访问和跨多个磁盘设备的去集群。 PIOUS的基础设施，然后将进一步加强设计适当的文件系统原语，使高层次的文件访问语义的有效实施，并允许大型结构化和异构数据集被有效地存储和访问在分布式网络环境。 一个适当的文件模型将被定义，基于一个可扩展的和灵活的，多层的体系结构，并将指定一组访问接口，这些方法将被实现为一套便携式和高效的运行时库和支持软件。 ***

The PIOUS system is an experimental software architecture for efficient data management and I/O in heterogeneous parallel and distributed computing environments. PIOUS offers scalable concurrency control with standard consistency semantics, presents global or segmented views of parallel files to applications, and declusters physical data for improved performance. Concurrency control in PIOUS is based on transactions, and permits either volatile or stable file access semantics for increased throughput or resilience to system failures. The goal of this project is to complete and implement the PIOUS prototype system on the PVM message passing substrate. The system will consist of an API library that is designed to present familiar file system syntax and semantics, while permitting multiple concurrent accesses and declustering across multiple disk devices. The PIOUS infrastructure will then be further enhanced by designing appropriate file system primitives that will enable the efficient implementation of high level file access semantics and permit large structured and heterogeneous data sets to be efficiently stored and accessed in distributed networked environments. An appropriate file model will be defined, based on an extensible and flexible, multilayered architecture, and will specify a set of access interfaces; these methods will be realized as a suite of portable and efficient runtime libraries and support software. ***