Efficient Runahead Threads

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Provided by: Association for Computing Machinery
Topic: Hardware
Format: PDF
Run-a-head Threads (RaT) is a promising solution that enables a thread to speculatively run ahead and prefetch data instead of stalling for a long-latency load in a simultaneous multithreading processor. With this capability, RaT can reduce resource monopolization due to memory-intensive threads and exploits memory-level parallelism, improving both system performance and single-thread performance. Unfortunately, the benefits of RaT come at the expense of increasing the number of executed instructions, which adversely affects its energy efficiency. In this paper, the authors propose Run-a-head Distance Prediction (RDP), a simple technique to improve the efficiency of Run-a-head Threads.
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