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Performance Evaluation and Improvements of the PoCL Open-Source OpenCL Implementation on Intel CPUs

Tobias Baumann, Matthias Noack, Thomas Steinke
Zuse Institute Berlin, Berlin, Germany
International Workshop on OpenCL (IWOCL’21), 2021

@inproceedings{baumann2021performance,

   title={Performance Evaluation and Improvements of the PoCL Open-Source OpenCL Implementation on Intel CPUs},

   author={Baumann, Tobias and Noack, Matthias and Steinke, Thomas},

   booktitle={International Workshop on OpenCL},

   pages={1–12},

   year={2021}

}

The Portable Computing Language (PoCL) is a vendor independent open-source OpenCL implementation that aims to support a variety of compute devices in a single platform. Evaluating PoCL versus the Intel OpenCL implementation reveals significant performance drawbacks of PoCL on Intel CPUs – which run 92 % of the TOP500 list. Using a selection of benchmarks, we identify and analyse performance issues in PoCL with a focus on scheduling and vectorisation. We propose a new CPU device-driver based on Intel Threading Building Blocks (TBB), and evaluate LLVM with respect to automatic compiler vectorisation across work-items in PoCL. Using the TBB driver, it is possible to narrow the gap to Intel OpenCL and even outperform it by a factor of up to 1.3× in our proxy application benchmark with a manual vectorisation strategy.
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