Disk-directed I/O for MIMD multiprocessors

  • Authors:
  • David Kotz

  • Affiliations:
  • Department of Computer Science, Dartmouth College, Hanover, NH

  • Venue:
  • OSDI '94 Proceedings of the 1st USENIX conference on Operating Systems Design and Implementation
  • Year:
  • 1994

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Abstract

Many scientific applications that run on today's multiprocessors, such as weather forecasting and seismic analysis, are bottlenecked by their file-I/O needs. Even if the multiprocessor is configured with sufficient I/O hardware, the file-system software often fails to provide the available bandwidth to the application. Although libraries and enhanced file-system interfaces can make a significant improvement, we believe that fundamental changes are needed in the file-server software. We propose a new technique, disk-directed I/O, to allow the disk servers to determine the flow of data for maximum performance. Our simulations show that tremendous performance gains are possible. Indeed, disk-directed I/O provided consistent high performance that was largely independent of data distribution, obtained up to 93% of peak disk bandwidth, and was as much as 16 times faster than traditional parallel file systems.