Accession Number:

ADA626686

Title:

Mapping the Conjugate Gradient Algorithm onto High Performance Heterogeneous Computers

Descriptive Note:

Master's thesis

Corporate Author:

JACKSON STATE UNIV MS

Personal Author(s):

Report Date:

2014-05-01

Pagination or Media Count:

143.0

Abstract:

Mapping scientific kernels onto high performance heterogeneous computers HPHC must comply with certain rules of thumb or heuristics. Previous research by Jackson State Universitys JSU HPHC research group has provided anecdotal evidence illustrating some of these rulesheuristics. The research highlighted by this thesis corroborates the credibility of these rules. In particular, four versions two pairs of a floating-point sparse matrix conjugate gradient CG iterative solver are presented. JSU s state-of-the-art HPHC utilizes general purpose processors GPP and heterogeneous computational hardware, in particular, a field programmable gate array FPGA, to develop the CG kernels. The first version of the pair executes strictly on the GPP and the second uses both the GPP and FPGA to map the entire CG algorithm onto hardware. For the second pair, a refactored version of CG is used, which is statically analyzed to determine where the most computationally expensive operation occurs. This operation is the sparse matrix vector multiply MVM kernel. Based on this analysis, the software version of CG is refactored to call MVM as a subroutine. An FPGA version of the MVM algorithm is also developed and a static analysis of that algorithm suggests a speedup of the MVM kernel. All four version of CG are executed using a specially designed set of sparse matrices and the results demonstrate that adherence to the rules of thumb and heuristics when mapping scientific kernels onto a HPHC can lead to significant speedups.

Subject Categories:

  • Computer Programming and Software
  • Computer Hardware

Distribution Statement:

APPROVED FOR PUBLIC RELEASE