本文介绍了在混合多核架构上的一种动态冗余技术——线程阴影。线程阴影通过在不同模式下（如软件和硬件）运行被观察线程及其副本，并比较它们的签名来检测错误。研究了块处理应用的实验，展示了不同线程阴影模式下的开销、检测延迟和覆盖范围。结果显示，跨模式线程阴影虽然检测延迟较长，但能以较低的开销提供良好的覆盖率。
摘要：
Dynamic thread duplication is a known redundancy technique for multi-cores. The approach duplicates a thread under observation for some time period and compares the signatures of the two threads to detect errors. Hybrid multi-cores, typically implemented on platform FPGAs, enable the unique option of running the thread under observation and its copy in different modalities, i.e., software and hardware. We denote our dynamic redundancy technique on hybrid multi-cores as thread shadowing . In this paper we present the concept of thread shadowing and an implementation on a multi-threaded hybrid multi-core architecture. We report on experiments with a block-processing application and demonstrate the overheads, detection latencies and coverage for a range of thread shadowing modes. The results show that trans-modal thread shadowing, although bearing long detection latencies, offers attractive coverage at a low overhead.
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