@TechReport{ap:enwrich-tr,
  author = {Apratim Purakayastha and Carla Schlatter Ellis and David Kotz},
  title = {{ENWRICH:} A Compute-Processor Write Caching Scheme for Parallel
  File Systems},
  year = {1995},
  month = {October},
  number = {CS-1995-22},
  institution = {Dept. of Computer Science, Duke University},
  copyright = {the authors},
  later = {ap:enwrich},
  URL = {ftp://ftp.cs.duke.edu/dist/techreport/1995/1995-22.ps.gz},
  URLpdf = {http://www.cs.dartmouth.edu/~dfk/papers/ap:enwrich-tr.pdf},
  keywords = {parallel file system, parallel I/O, caching, pario-bib, dfk},
  abstract = {Many parallel scientific applications need high-performance I/O.
  Unfortunately, end-to-end parallel-I/O performance has not been able to keep
  up with substantial improvements in parallel-I/O hardware because of poor
  parallel file-system software. Many radical changes, both at the interface
  level and the implementation level, have recently been proposed. One such
  proposed interface is {\em collective I/O}, which allows parallel jobs to
  request transfer of large contiguous objects in a single request, thereby
  preserving useful semantic information that would otherwise be lost if the
  transfer were expressed as per-processor non-contiguous requests. Kotz has
  proposed {\em disk-directed I/O} as an efficient implementation technique for
  collective-I/O operations, where the compute processors make a single
  collective data-transfer request, and the I/O processors thereafter take full
  control of the actual data transfer, exploiting their detailed knowledge of
  the disk-layout to attain substantially improved performance. \par Recent
  parallel file-system usage studies show that writes to write-only files are a
  dominant part of the workload. Therefore, optimizing writes could have a
  significant impact on overall performance. In this paper, we propose ENWRICH,
  a compute-processor write-caching scheme for write-only files in parallel
  file systems. ENWRICH combines low-overhead write caching at the compute
  processors with high performance disk-directed I/O at the I/O processors to
  achieve both low latency and high bandwidth. This combination facilitates the
  use of the powerful disk-directed I/O technique independent of any particular
  choice of interface. By collecting writes over many files and applications,
  ENWRICH lets the I/O processors optimize disk I/O over a large pool of
  requests. We evaluate our design via simulated implementation and show that
  ENWRICH achieves high performance for various configurations and workloads.}
}