Processors

Real-Time, Unobtrusive, and Efficient Program Execution Tracing With Stream Caches and Last Stream Predictors

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Executive Summary

This paper introduces a new hardware mechanism for capturing and compressing program execution traces unobtrusively in real-time. The proposed mechanism is based on two structures called stream cache and last stream predictor. The authors explore the effectiveness of a trace module based on these structures and analyze the design space. They show that the trace module, with less than 600 bytes of state, achieves a trace-port bandwidth of 0.15 bits/instruction/processor, which is over six times better than state-of-the-art commercial designs.

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