关键词: 集合通信, 通信性能, 可扩展性

Abstract: The performance of collective communications impacts the efficiency of large scale parallel numerical computing application. Since the theoretic analysis and evaluation on every type of collective communications is still insufficient for the programmer, the communication modules of many applications are designed and used unreasonably. Using Intel IMB benchmark, this paper analyzes and evaluates the typical MPI (message passing interface) collective communication on BXJ supercomputer (a parallel machine platform), and gives the theoretic results based on the current model and algorithm. The results show that the performance of different MPI collective communications is different. There is an obvious gap between the actual value of some collective communication and theoretic value. The results reflect that there are still many researches, such as accurate theoretic performance model for some collective communication, optimization of collective communication, and optimization of application communication module, etc.

Key words: collective communication, communication performance, scalability