SC13 Home > SC13 Schedule > SC13 Presentation - Enabling Low I/O-Cost Fine-Grained Checkpointing in QMCPack

SCHEDULE: NOV 16-22, 2013

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Enabling Low I/O-Cost Fine-Grained Checkpointing in QMCPack

SESSION: ACM Student Research Competition Poster Reception

EVENT TYPE: ACM Student Research Competition Posters, ACM Student Research Competition

TIME: 5:15PM - 7:00PM

AUTHOR(S):Michael Matheny

ROOM:Mile High Pre-Function

As simulation size increases, the likelihood of a node crash and the cost of checkpointing increases. This is more of a problem as flops increase exponentially while I/O speeds increase at a slower rate. The cost of saving data is even higher when checkpointed data is used for in-situ or in-transit analyses such as for visualization or for atom proximity identifications. QMCPack is one such example that is limited by its checkpointing implementation. QMCPack uses serial HDF5 to write checkpointing data to disk. As the number of processes increase, the associated I/O cost grows significantly. Preliminary results showed that even for simple simulations, the time spent in I/O associated to a checkpointing could make up 90% of the execution time on systems with large numbers of nodes. In this poster we use ADIOS to tackle the problem of enabling more efficient fine-grained checkpointing in QMCPack while limiting the I/O overhead.

Chair/Author Details:

Michael Matheny - University of Delaware

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