Author retrospective for PYRROS: static task scheduling and code generation for message passing multiprocessors.

ABSTRACTGiven a program with annotated task parallelism represented as a directed acyclic graph (DAG), the PYRROS project was focused on fast DAG scheduling, code generation and runtime execution on distributed memory architectures. PYRROS scheduling goes through several processing stages including clustering of tasks, cluster mapping, and task execution ordering. Since the publication of the PYRROS project, there have been new advancements in the area of DAG scheduling algorithms, the use of DAG scheduling for irregular and large-scale computation, and software system development with annotated task parallelism on modern parallel and cloud architectures. This retrospective describes our experience from this project and the follow-up work, and reviews representative papers related to DAG scheduling published in the last decade.