Optimizing Chapel for Single-Node Environments.

This paper investigates how Chapel performance compares with other parallel frameworks. We provide specific examples of how programmers may improve their single-node (single-locale) Chapel programs to improve performance. We also identify some changes that would be possible to the language to make it easier to get these performance gains. Specifically, we compare the intranode performance of Chapel programs with OpenMP in C/C++ by conducting case studies profiling the LULESH, MiniMD, SSCA#2, and CLOMP benchmarks. Our optimization techniques demonstrate improved runtime performance of Chapel benchmarks by factors of 3x, 5.3x, 6.3x, and 4.8x respectively and outperformed their OpenMP counterparts by factors of 2x for LULESH, 1.6x for SSCA#2, and 4.8x for CLOMP.