Todd Kordenbrock

Learn More
Significant challenges exist for achieving peak or even consistent levels of performance when using IO systems at scale. They stem from sharing IO system resources across the processes of single largescale applications and/or multiple simultaneous programs causing internal and external interference, which in turn, causes substantial reductions in IO(More)
Today's high-end massively parallel processing (MPP) machines have thousands to tens of thousands of processors , with next-generation systems planned to have in excess of one hundred thousand processors. For systems of such scale, efficient I/O is a significant challenge that cannot be solved using traditional approaches. In particular, general purpose(More)
Efficient data movement is an important part of any high-performance I/O system, but it is especially critical for the current and next-generation of massively parallel processing (MPP) systems. In this paper, we discuss how the scale, architecture, and organization of current and proposed MPP systems impact the design of the data-movement scheme for the(More)
The increasing fidelity of scientific simulations as they scale towards exascale sizes is straining the proven IO techniques championed throughout terascale computing. Chief among the successful IO techniques is the idea of collective IO where processes coordinate and exchange data prior to writing to storage in an effort to reduce the number of small,(More)
This poster presents an overview of and the performance results of recent I/O advancements in the parallel CMAQ framework. These optimizations were developed as part of a collaboration between the EPA and Sandia National Laboratories. netCDF provides a portable file format and an easily understood API, but it does not support concurrent writes by multiple(More)
Sandia is a multiprogram laboratory operated by Sandia Corporation, NOTICE: This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government, nor any agency thereof, nor any of their employees, nor any of their contractors, subcontractors, or their employees, make any warranty,(More)
  • 1