A Probabilistic Machine Learning Approach to Scheduling Parallel Loops With Bayesian Optimization
- 주제(키워드) 도움말 Frequency selective surfaces , Task analysis , Heuristic algorithms , Dynamic scheduling , Optimization , Scheduling algorithms , Copper , Parallel loop scheduling , Bayesian optimization , parallel computing , OpenMP
- 발행기관 IEEE COMPUTER SOC
- 발행년도 2021
- 총서유형 Journal
- 본문언어 영어
초록/요약 도움말
This article proposes Bayesian optimization augmented factoring self-scheduling (BO FSS), a new parallel loop scheduling strategy. BO FSS is an automatic tuning variant of the factoring self-scheduling (FSS) algorithm and is based on Bayesian optimization (BO), a black-box optimization algorithm. Its core idea is to automatically tune the internal parameter of FSS by solving an optimization problem using BO. The tuning procedure only requires online execution time measurement of the target loop. In order to apply BO, we model the execution time using two Gaussian process (GP) probabilistic machine learning models. Notably, we propose a locality-aware GP model, which assumes that the temporal locality effect resembles an exponentially decreasing function. By accurately modeling the temporal locality effect, our locality-aware GP model accelerates the convergence of BO. We implemented BO FSS on the GCC implementation of the OpenMP standard and evaluated its performance against other scheduling algorithms. Also, to quantify our method's performance variation on different workloads, or workload-robustness in our terms, we measure the minimax regret. According to the minimax regret, BO FSS shows more consistent performance than other algorithms. Within the considered workloads, BO FSS improves the execution time of FSS by as much as 22% and 5% on average.
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