Redefining the Role of the CPU in the Era of CPU-GPU Integration

Authors:
Manish Arora;Siddhartha Nath;Subhra Mazumdar;Scott B. Baden;Dean M. Tullsen
Affiliations:
University of California, San Diego;University of California, San Diego;University of California, San Diego;University of California, San Diego;University of California, San Diego
Venue:
IEEE Micro
Year:
2012

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Abstract

In an integrated CPU-GPU system, the CPU executes code that is profoundly different than in past CPU-only environments. This new code's characteristics should drive future CPU design and architecture. Post-GPU code has lower instruction-level parallelism, more difficult branch prediction, and loads and stores that are significantly harder to predict. Post-GPU code exhibits much smaller gains from the availability of multiple cores, owing to reduced thread-level parallelism.