CADET: A Systematic Method For Debugging Misconfigurations using Counterfactual Reasoning

10/12/2020 ∙ by Rahul Krishna, et al. ∙ 0

Modern computing platforms are highly-configurable with thousands of interacting configurations. However, configuring these systems is challenging. Erroneous configurations can cause unexpected non-functional faults. This paper proposes CADET (short for Causal Debugging Toolkit) that enables users to identify, explain, and fix the root cause of non-functional faults early and in a principled fashion. CADET builds a causal model by observing the performance of the system under different configurations. Then, it uses casual path extraction followed by counterfactual reasoning over the causal model to: (a) identify the root causes of non-functional faults, (b) estimate the effects of various configurable parameters on the performance objective(s), and (c) prescribe candidate repairs to the relevant configuration options to fix the non-functional fault. We evaluated CADET on 5 highly-configurable systems deployed on 3 NVIDIA Jetson systems-on-chip. We compare CADET with state-of-the-art configuration optimization and ML-based debugging approaches. The experimental results indicate that CADET can find effective repairs for faults in multiple non-functional properties with (at most) 17 28 debugging methods. Compared to multi-objective optimization approaches, CADET can find fixes (at most) 9× faster with comparable or better performance gain. Our case study of non-functional faults reported in NVIDIA's forum show that CADET can find 14 30 minutes.

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