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

  • 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.
Author:Tobias BaumannORCiD, Matthias NoackORCiD, Thomas SteinkeORCiD
Document Type:In Proceedings
Parent Title (English):IWOCL'21: International Workshop on OpenCL
Year of first publication:2021
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