OpenMP Versus OpenCL
Difference in Performance?
Julia Fedorova; Sergei Vinogradov; Dmitry Prohorov Intel Corporation, Russia
Abstract
This chapter compares OpenMP and OpenCL, which offer different constructs for describing data parallelism, with the question of whether one has an advantage over the other in the performance. A set of benchmarks is examined that initially show an advantage for OpenCL over OpenMP due to the optimization in the OpenCL code and algorithms, which were not present in naive OpenMP versions. OpenMP was slightly faster once these were corrected in these benchmarks. Also, a set of performance improvements are discussed that were found to be common for all workloads: use of local memory to achieve better ...
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