XMT-GPU: A PRAM Architecture for Graphics Computation
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DuBois, Thomas M., Bryant Lee, Yi Wang, Marc Olano, and Uzi Vishkin. “XMT-GPU: A PRAM Architecture for Graphics Computation.” 2008 37th International Conference on Parallel Processing, September 2008, 364–72. https://doi.org/10.1109/ICPP.2008.35.
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Abstract
The shading processors in graphics hardware are becoming increasingly general-purpose. We test, through simulation and benchmarking, the potential performance impact of replacing these processors with a fully general-purpose parallel processor, without the fixed-function graphics hardware legacy of current graphics processing units (GPUs). The representative general-purpose processor we test against is XMT (for eXplicit Multi-Threading), a PRAM-like single-chip parallel architecture. Performance is compared for two characteristic shaders running in a fragment-limited GPU benchmark harness and on a cycle-accurate XMT simulator. The general-purpose processor is found to be significantly faster at a compute-only shader, but slower on a memory bound texture shader. Finally we analyze the design tradeoffs that would allow combining the best of both worlds: (i) a competitive XMT texture shader, with (ii) a general-purpose easy-to-program XMT many-core approach that scales up or down to the amount of parallelism provided by the application and is even compatible with serial code.