syncchecker: detecting synchronization errors between mpi applications and libraries

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	syncchecker: detecting synchronization errors between mpi applications and libraries
	Chen Zhezhe ; Li Xinyu ; Chen Jau-Yuan ; Zhong Hua ; Qin Feng
	2012
会议名称	2012 IEEE 26th International Parallel and Distributed Processing Symposium, IPDPS 2012
会议日期	May 21, 2012 - May 25, 2012
会议地点	Shanghai, China
关键词	Communication Computer operating systems Distributed parameter networks Experiments Libraries Software testing
页码	342-353
中文摘要	While improving the performance, nonblocking communication is prone to synchronization errors between MPI applications and the underlying MPI libraries. Such synchronization error occurs in the following way. After initiating nonblocking communication and performing overlapped computation, the MPI application reuses the message buffer before the MPI library completes the use of the same buffer, which may lead to sending out corrupted message data or reading undefined message data. This paper presents a new method called Sync Checker to detect synchronization errors in MPI nonblocking communication. To examine whether the use of message buffers is well synchronized between the MPI application and the MPI library, Sync Checker first tracks relevant memory accesses in the MPI application and corresponding message send/receive operations in the MPI library. Then it checks whether the correct execution order between the MPI application and the MPI library is enforced by the MPI completion check routines. If not, Sync Checker reports the error with diagnostic information. To reduce runtime overhead, we propose three dynamic optimizations. We have implemented a prototype of Sync Checker on Linux and evaluated it with seven bug cases, i.e., five introduced by the original developers and two injected, in four different MPI applications. Our experiments show that Sync Checker detects all the evaluated synchronization errors and provides helpful diagnostic information. Moreover, our experiments with seven NAS Parallel Benchmarks demonstrate that Sync Checker incurs moderate runtime overhead, 1.3-9.5 times with an average of 5.2 times, making it suitable for software testing. © 2012 IEEE.
英文摘要	While improving the performance, nonblocking communication is prone to synchronization errors between MPI applications and the underlying MPI libraries. Such synchronization error occurs in the following way. After initiating nonblocking communication and performing overlapped computation, the MPI application reuses the message buffer before the MPI library completes the use of the same buffer, which may lead to sending out corrupted message data or reading undefined message data. This paper presents a new method called Sync Checker to detect synchronization errors in MPI nonblocking communication. To examine whether the use of message buffers is well synchronized between the MPI application and the MPI library, Sync Checker first tracks relevant memory accesses in the MPI application and corresponding message send/receive operations in the MPI library. Then it checks whether the correct execution order between the MPI application and the MPI library is enforced by the MPI completion check routines. If not, Sync Checker reports the error with diagnostic information. To reduce runtime overhead, we propose three dynamic optimizations. We have implemented a prototype of Sync Checker on Linux and evaluated it with seven bug cases, i.e., five introduced by the original developers and two injected, in four different MPI applications. Our experiments show that Sync Checker detects all the evaluated synchronization errors and provides helpful diagnostic information. Moreover, our experiments with seven NAS Parallel Benchmarks demonstrate that Sync Checker incurs moderate runtime overhead, 1.3-9.5 times with an average of 5.2 times, making it suitable for software testing. © 2012 IEEE.
收录类别	EI
会议录	Proceedings of the 2012 IEEE 26th International Parallel and Distributed Processing Symposium, IPDPS 2012
语种	英语
ISBN号	9780769546759
内容类型	会议论文
源URL	[http://ir.iscas.ac.cn/handle/311060/15748]
专题	软件研究所_软件所图书馆_会议论文
推荐引用方式 GB/T 7714	Chen Zhezhe,Li Xinyu,Chen Jau-Yuan,et al. syncchecker: detecting synchronization errors between mpi applications and libraries[C]. 见:2012 IEEE 26th International Parallel and Distributed Processing Symposium, IPDPS 2012. Shanghai, China. May 21, 2012 - May 25, 2012.