Tools That Led To Increased Program Performance

This papers describes a set of tools that help a programmer be more e cient in optimizing scienti c programs for a parallel computer. The design of these tools emerged from experience gained during a successful optimization e ort on a set of representative supercomputer application codes. We have developed a number of utilities that complement available Unix tools. Additional tools o er a higher degree of interactivity; they are currently built into the Emacs editor which o ers help and customization facilities. The new tools mainly facilitate two development phases that were identi ed as most time-consuming in the optimization project: The process of creating a consistent set of experimental program variants and the analysis and interpretation of compilation and performance results.