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For an increasing number of data intensive scientific applications, parallelI/O concepts are a major performance issue. Tackling this issue, we develop aninput/output system designed for highly efficient, scalable and convenientlyusable parallel I/O on distributed memory systems. The main focus of thisresearch is the parallel I/O runtime system support provided forsoftware-generated programs produced by parallelizing compilers in the contextof High Performance FORTRAN efforts. Specifically, our design aims for theVienna Fortran Compilation System.  In our research project we investigate the I/O problem from a runtime systemsupport perspective. We focus on the design of an advanced parallel I/Osupport, called ViPIOS (VIenna Parallel I/O System), to be targeted by languagecompilers supporting the same programming model like High Performance Fortran(HPF). The ViPIOS design is partly influenced by the concepts of paralleldatabase technology.  At the beginning of the project we developed a formal model, which forms atheoretical framework on which the ViPIOS design is based. This model describesthe mapping of the problem specific data space starting from the applicationprogram data structures down to the physical layout on disk across severalintermediate representation levels.  Based on this formal model we designed and developed an I/O runtime system,ViPIOS, which provides support for several issues, as - parallel access tofiles for read/write operations, - optimization of data-layout on disks, -redistribution of data stored on disks, - communication of out-of-core (OOC)data, and - many optimizations including data prefetching from disks based onthe access pattern knowledge extracted from the program by the compiler orprovided by a user specification.

ViPIOS - VIenna Parallel Input Output System: Language, Compiler and Advanced Data Structure Support for Parallel I/O Operations