Robust Non-Intrusive Record-Replay with Processor Extraction
Workshop on Parallel and Distributed Systems: Testing, Analysis, and Debugging at ISSTA (PADTAD) 2010
Publication Type: Talk
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Summary
With the advent of increasingly larger parallel machines, debugging is becoming more and more challenging. In particular, applications at this scale tend to behave non-deterministically, leading to race condition bugs. Furthermore, gaining access to these large machines for long debugging sessions is generally infeasible. In this paper, we present a 3-step algorithm to perform what we call "processor extraction": a procedure to record the execution of a set of processors from a parallel application, and replay any of them in a controlled environment. Our technique generates very low interference in the recorded program thanks to the separation between non-determinism elimination, and detailed processor recording. In order to improve robustness and accuracy, we further augmented our algorithm with a self-correction mechanism.
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