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SCHEDULE: NOV 16-21, 2014
When viewing the Technical Program schedule, on the far righthand side is a column labeled "PLANNER." Use this planner to build your own schedule. Once you select an event and want to add it to your personal schedule, just click on the calendar icon of your choice (outlook calendar, ical calendar or google calendar) and that event will be stored there. As you select events in this manner, you will have your own schedule to guide you through the week.
Lossy Compression for Checkpointing: Fallible or Feasible?
SESSION: Poster Reception
EVENT TYPE: Posters
TIME: 5:15PM - 7:00PM
AUTHOR(S):Xiang Ni, Tanzima Islam, Kathryn Mohror, Adam Moody, Laxmikant V. Kale
ROOM:New Orleans Theater Lobby
ABSTRACT:
As HPC applications scale to hundreds of thousands of processors, large checkpoints consume a lot of space making it costly to fit them in memory or burst buffers. It also takes a significant amount of time to transfer them to stable storage. Lossless compression fail to reduce the size of such checkpoints due to randomness in the lower bits of typical floating point scientific data. To address this challenge, we propose use of lossy compression for reducing checkpoint size significantly, and study its impact on correctness of application execution. We study the trade-off between the loss of precision, compression ratio, and correctness due to lossy compression. For ChaNGa, we show that use of moderate lossy compression reduces checkpoint size by 3-5x while maintaining correctness. Finally, we inject failures following different distributions to study whether an application is more sensitive to precision loss at earlier or later stages of the simulation.
Chair/Author Details:
Xiang Ni - University of Illinois at Urbana-Champaign
Tanzima Islam - Lawrence Livermore National Laboratory
Kathryn Mohror - Lawrence Livermore National Laboratory
Adam Moody - Lawrence Livermore National Laboratory
Laxmikant V. Kale - University of Illinois at Urbana-Champaign
Click here to download .ics calendar file
