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CUDA C++AMP Performance portability of parallel kernels on shared-memory systems text Hwu, Wen-Mei W. Hwu, Wen-Mei W. Chen, Deming Lumetta, Steven S. Padua, David A. Stratton, John 2013-05-24T22:09:48Z 2013-05-24T22:09:48Z 2013-05 2013-05-24T22:09:48Z 2013-05 This work describes my solution to the performance portability problem: between CPUs and GPUs in particular, but laying the foundation for even broader performance portability support. I argue that the best approach is to use a language like OpenCL as a portable, low-level programming model with well-defined mechanisms for expressing multi-level parallelism and locality. That low-level program representation can be supported with architecture-specific compilers, runtimes, and libraries to target the application code to various platforms with high performance. High-level language designers or tool developers could then target this single, low-level programming and parallelism model as a portable, high-performance intermediate program representation. To demonstrate the feasibility of this approach, I show how one would design a good CPU implementation of OpenCL given that the programs are written according to the current high-level GPU vendor optimization guidelines. Programs written in such a way already meet the criteria of good GPU performance, and in this work, I show that those same programs on a CPU platform implemented according to my proposals can out-perform an OpenMP implementation of the same algorithm on the same system. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2013-01-07T20:51:17Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Dissertation_Stratton_John.zip: 4265528 bytes, checksum: d4499bed6a78434fdeccbf84fb8761da (MD5) Stratton_John.pdf: 1698270 bytes, checksum: e0a249b49b6cb4d010fb7764ffa6d934 (MD5) Made available in DSpace on 2013-05-24T22:09:48Z (GMT). No. of bitstreams: 3 John_Stratton.pdf: 1698270 bytes, checksum: e0a249b49b6cb4d010fb7764ffa6d934 (MD5) Dissertation_Stratton_John.zip: 4265528 bytes, checksum: d4499bed6a78434fdeccbf84fb8761da (MD5) license.txt: 4063 bytes, checksum: c6f8541556b3c9c34cb9cc55c17f2446 (MD5) http://hdl.handle.net/2142/44383 en Copyright 2013 John Stratton Performance Portability OpenCL Electrical & Computer Eng 1933 Electrical & Computer Engr 1200 University of Illinois at Urbana-Champaign Dissertation Ph.D. PHD:Electr & Computer Eng-UIUC 10KS1200PHD