关键词: 容错, 降级, 检查点, Parallel C语言

Abstract: Heterogeneous many-core computer system has become the development direction of supercomputer, due to its outstanding advantages like high computational ability and high performance. However, the complex heterogeneous architecture and huge system scale have brought great challenges to the system usability. Therefore, the research of lightweight fault tolerant techniques in heterogeneous many-core system is of great significance. In terms of the large time cost problem in classical system level fault tolerance, two language supported fault tolerance mechanisms are designed and realized in Parallel C language, namely lightweight degrade via local fault sensing and checkpoint technique by automatic analysis together with complier guidance. The local fault sensing lightweight degrade is realized by dynamic task scheduling framework, which is suitable for the many-core system and can be expanded to parallel computing with millions scales. The checkpoint technique by automatic analysis and complier guidance can reduce the total amount of retained and restored data by simple complier guidance which uses complier to analyze the unnecessary data. The experimental results in Sunway Taihu Light supercomputer show that, in comparison with the classical fault tolerance methods, the proposed fault tolerance mechanisms have good performance. The fault tolerance cost rate of the lightweight degrade is less than 1 percent, which is 3.5 percent less than the traditional method of rewinding fault tolerant in one fault execution time. The restored data in the proposed checkpoint technique in the typical application can be reduced to 1/10, which shows good practicality.

Key words: fault tolerant, degrade, checkpoint, Parallel C language