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- W3150764511 abstract "Traditionally, research in fault tolerance has required architectural state to be numerically perfect for program execution to be correct. However, in many programs, even if execution is not 100% numerically correct, the program can still appear to execute correctly from the user's perspective. To quantify user satisfaction, application-level fidelity metrics (such as PSNR) can be used. The output for such applications is defined to be correct if the fidelity metrics satisfy a certain threshold. However, such applications still contain instructions whose outputs are critical - i.e. their correctness decides if the overall quality of the program output is acceptable. In this paper, we present an analysis technique for identifying such critical program segments. More importantly, our technique is capable of guaranteeing application-level correctness through a combination of static analysis and runtime monitoring. Our static analysis consists of data flow analysis followed by control flow analysis to find static critical instructions which affect several instructions. Critical instructions are further refined into likely non-critical and likely critical sets in a profiling phase. At runtime, we use a monitoring scheme to monitor likely non-critical instructions and take remedial actions if some likely non-critical instructions become critical. Based on this analysis, we minimize the number of instructions that are duplicated and checked at runtime using a software-based fault detection and recovery technique [20]. Put together, our approach can lead to 22% average energy savings for multimedia applications while guaranteeing application-level correctness, when compared to a recent work [9], which cannot guarantee application-level correctness. Comparing to the approach proposed in [20] which guarantees both application-level and numerical correctness, our method achieves 79% energy reduction." @default.
- W3150764511 created "2021-04-13" @default.
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- W3150764511 date "2011-11-01" @default.
- W3150764511 modified "2023-10-18" @default.
- W3150764511 title "Assuring application-level correctness against soft errors" @default.
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- W3150764511 doi "https://doi.org/10.1109/iccad.2011.6105319" @default.
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