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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 | |
| Conference Name | 2012 IEEE 26th International Parallel and Distributed Processing Symposium, IPDPS 2012 |
| Source | Proceedings of the 2012 IEEE 26th International Parallel and Distributed Processing Symposium, IPDPS 2012 |
| Pages | 342-353 |
| Conference Date | May 21, 2012 - May 25, 2012 |
| Conference Place | Shanghai, China |
| Indexed Type | EI |
| ISBN | 9780769546759 |
| Department | (1) Dept. of Computer Science and Engineering Ohio State University United States; (2) Technology Center of Software Engineering Institute of Software Chinese Academy of Sciences China |
| English Abstract | 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.; 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. |
| Keyword | Communication Computer Operating Systems Distributed Parameter Networks Experiments Libraries Software Testing |
| Language | 英语 |
| Content Type | 会议论文 |
| URI | http://ir.iscas.ac.cn/handle/311060/15748 |
| Collection | 中国科学院软件研究所 |
| Recommended Citation GB/T 7714 | Chen Zhezhe,Li Xinyu,Chen Jau-Yuan,et al. syncchecker: detecting synchronization errors between mpi applications and libraries[C],2012:342-353. |
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