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Issue No. 11 - November (2009 vol. 58)
ISSN: 0018-9340
pp: 1512-1524
Zizhong Chen , Colorado School of Mines, Golden
Jack Dongarra , University of Tennessee, Knoxville
As the number of processors in today's high-performance computers continues to grow, the mean-time-to-failure of these computers is becoming significantly shorter than the execution time of many current high-performance computing applications. Although today's architectures are usually robust enough to survive node failures without suffering complete system failure, most of today's high-performance computing applications cannot survive node failures. Therefore, whenever a node fails, all surviving processes on surviving nodes usually have to be aborted and the whole application has to be restarted. In this paper, we present a framework for building self-healing high-performance numerical computing applications so that they can adapt to node or link failures without aborting themselves. The framework is based on FT-MPI and diskless checkpointing. Our diskless checkpointing uses weighted checksum schemes, a variation of Reed-Solomon erasure codes over floating-point numbers. We introduce several scalable encoding strategies into the existing diskless checkpointing and reduce the overhead to survive k failures in p processes from 2 \lceil \log p \rceil . k ((\beta + 2\gamma ) m + \alpha ) to (1 + O ({\sqrt{p}\over \sqrt{m}} ) )^2 . k (\beta + 2\gamma ) m, where \alpha is the communication latency, {1\over \beta } is the network bandwidth between processes, {1\over \gamma } is the rate to perform calculations, and m is the size of local checkpoint per process. When additional checkpoint processors are used, the overhead can be reduced to (1 + O ({1\over \sqrt{m}} ) ) . k (\beta + 2\gamma ) m, which is independent of the total number of computational processors. The introduced self-healing algorithms are scalable in the sense that the overhead to survive k failures in p processes does not increase as the number of processes p increases. We evaluate the performance overhead of our self-healing approach by using a preconditioned conjugate gradient equation solver as an example. Experimental results demonstrate that our self-healing scheme can survive multiple simultaneous process failures with low-performance overhead and little numerical impact.
Self-healing, diskless checkpointing, fault tolerance, pipeline, parallel and distributed systems, high-performance computing, Message Passing Interface.

J. Dongarra and Z. Chen, "Highly Scalable Self-Healing Algorithms for High Performance Scientific Computing," in IEEE Transactions on Computers, vol. 58, no. , pp. 1512-1524, 2009.
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