OpenMP程序性能退化的诊断与处理

为了解决OpenMP程序性能退化问题，本文提出性能退化区和性能退化强度的概念．使用性能退化强度能够剔除非性能退化区并突出执行时间较长的性能退化代码段；同时．性能退化区的分解能够逐步缩小性能退化区并最终准确定位引发性能退化的代码段．去除引发性能退化的根源就能有效改进OpenMP程序的执行性能．实例分析证实了本文提出的OpenMP程序性能退化诊断与处理方法的有效性．

Performance Degradation Diagnosis and Solution for OpenMP Programs

In order to solve performance degradation in OpenMP programs,this paper proposes the conception about performance degradation region and performance degradation strength.Using performance degradation strength is able to eliminate code regions whose performance doesn't degrade and give prominence to performance degradation regions that need relatively long execution time.At the same time,the decomposition of performance degradation regions can reduce the scope of performance degradation regions and finally locate the code sections that result in performance degradation.Then,the performance of OpenMP programs will be improved through removing roots of performance degradation.The analysis of examples proves that the method of performance degradation diagnosis and solution for OpenMP programs proposed in this paper is efficient.