Jie Ren
ABSTRACT
Emerging non-volatile memory (NVM) is promising to be used as main memory, because of its good performance, density, and energy efficiency. Leveraging the non-volatility of NVM as main memory, we can recover data objects and resume application computation (recomputation) after the application crashes. The existing work studies how to ensure that data objects stored in NVM can be recovered to a consistent version during system recovery, a property referred to as crash consistency. However, enabling crash consistency often requires program modification and brings large runtime overhead.
In this paper, we use a different view to examine application recomputation in NVM. Without taking care of consistency of data objects, we aim to understand if the application can be recomputable, given possible inconsistent data objects in NVM. We introduce a PIN-based simulation tool, NVC, to study application recomputability in NVM without crash consistency. The tool allows the user to randomly trigger application crash and then perform postmortem analysis on data values in caches and memory to examine data consistency. We use NVC to study a set of applications. We reveal that some applications are inherently tolerant to the data inconsistency problem. We perform a detailed analysis of application recomputability without crash consistency in NVM.
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