Seminar Details:

LANS Informal Seminar
"Performance Tuning for GPUs - An Iterative Process"

DATE: June 2, 2014 to June 2, 2014

TIME: 14:00:00 - 15:00:00
SPEAKER: Karl Rupp, Postdoctoral Appointee, Institute for Microelectronics, Vienna University of Technology
LOCATION: Building 240 Room 1404-1405, Argonne National Laboratory

Description:
Despite all the improvements to both hardware and the software stack, programming graphics processing units (GPUs) for scientific applications remains a challenge, particularly if the resulting code should run on other, a-priori unknown GPUs. In this talk we present various levels of optimization for obtaining performance-portable GPU code: First, we start off with a standard conjugate gradient formulation and minimize data transfer for better performance. In a second step, we provide tuning results for common memory-bandwidth limited linear algebra operations across different hardware generations of the same vendor as well as across vendors. Finally, we rewrite the conjugate gradient algorithm in a mathematically equivalent way to improve data reuse.


 

Please send questions or suggestions to Debojyoti Ghosh: ghosh at mcs dot anl dot gov.