MEMORY LATENCY TOLERANCE SEVERAL SIMPLE TECHNIQUES CAN MAKE RUNAHEAD EXECUTION MORE EFFICIENT BY REDUCING THE NUMBER OF INSTRUCTIONS EXECUTED AND THEREBY REDUCING THE ADDITIONAL ENERGY CONSUMPTION TYP...


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    • Author:  by Onur Mutlu  Hyesoon Kim  Yale N. Patt  Runahead Execution  

    • Abstract:  Today?s high-performance processors face main-memory latencies on the order of hundreds of processor clock cycles. As a result, even the most aggressive processors spend a significant portion of their execution time stalling and waiting for main-memory accesses to return data to the execution core. Previous research has shown that runahead execution significantly increases a high-performance processor?s ability to tolerate long main-memory latencies. 1, 2 Runahead execution improves a processor?s performance by speculatively preexecuting the application program while the processor services a long-latency (L2) data cache miss, instead of stalling the processor for

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