SCHEDULE: NOV 10-16, 2012
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Byte-Precision Level of Detail Processing for Variable Precision Analytics
SESSION: Optimizing I/O For Analytics
EVENT TYPE: Papers
TIME: 10:30AM - 11:00AM
SESSION CHAIR: Dean Hildebrand
AUTHOR(S):John Jenkins, Eric Schendel, Sriram Lakshminarasimhan, Terry Rogers, David A. Boyuka, Stephane Ethier, Robert Ross, Scott Klasky, Nagiza F. Samatova
ROOM:355-D
ABSTRACT:
I/O bottlenecks in HPC applications are becoming a more pressing
problem as compute capabilities continue to outpace I/O capabilities.
While double-precision simulation data often must be stored losslessly, the loss
of some of the fractional component may introduce acceptably small errors to
many types of scientific analyses.
Given this observation, we develop a precision level of detail (APLOD)
library, which partitions double-precision datasets along user-defined
byte boundaries. APLOD parameterizes the analysis accuracy-I/O
performance tradeoff, bounds maximum relative error, maintains I/O access
patterns compared to full precision, and operates with
low overhead. Using ADIOS as an I/O use-case, we show proportional reduction in
disk access time to the degree of precision. Finally, we show the effects of
partial precision analysis on accuracy for operations such as k-means and
Fourier analysis, finding a strong applicability for the use of varying degrees
of precision to reduce the cost of analyzing extreme-scale data.
Chair/Author Details:
Dean Hildebrand (Chair) - IBM Almaden Research Center
John Jenkins - North Carolina State University
Eric Schendel - North Carolina State University
Sriram Lakshminarasimhan - North Carolina State University
Terry Rogers - North Carolina State University
David A. Boyuka - North Carolina State University
Stephane Ethier - Princeton Plasma Physics Laboratory
Robert Ross - Argonne National Laboratory
Scott Klasky - Oak Ridge National Laboratory
Nagiza F. Samatova - North Carolina State University
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Byte-Precision Level of Detail Processing for Variable Precision Analytics
SESSION: Optimizing I/O For Analytics
EVENT TYPE:
TIME: 10:30AM - 11:00AM
SESSION CHAIR: Dean Hildebrand
AUTHOR(S):John Jenkins, Eric Schendel, Sriram Lakshminarasimhan, Terry Rogers, David A. Boyuka, Stephane Ethier, Robert Ross, Scott Klasky, Nagiza F. Samatova
ROOM:355-D
ABSTRACT:
I/O bottlenecks in HPC applications are becoming a more pressing
problem as compute capabilities continue to outpace I/O capabilities.
While double-precision simulation data often must be stored losslessly, the loss
of some of the fractional component may introduce acceptably small errors to
many types of scientific analyses.
Given this observation, we develop a precision level of detail (APLOD)
library, which partitions double-precision datasets along user-defined
byte boundaries. APLOD parameterizes the analysis accuracy-I/O
performance tradeoff, bounds maximum relative error, maintains I/O access
patterns compared to full precision, and operates with
low overhead. Using ADIOS as an I/O use-case, we show proportional reduction in
disk access time to the degree of precision. Finally, we show the effects of
partial precision analysis on accuracy for operations such as k-means and
Fourier analysis, finding a strong applicability for the use of varying degrees
of precision to reduce the cost of analyzing extreme-scale data.
Chair/Author Details:
Dean Hildebrand (Chair) - IBM Almaden Research Center
John Jenkins - North Carolina State University
Eric Schendel - North Carolina State University
Sriram Lakshminarasimhan - North Carolina State University
Terry Rogers - North Carolina State University
David A. Boyuka - North Carolina State University
Stephane Ethier - Princeton Plasma Physics Laboratory
Robert Ross - Argonne National Laboratory
Scott Klasky - Oak Ridge National Laboratory
Nagiza F. Samatova - North Carolina State University
Click here to download .ics calendar file