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T-SPaCS-A Two-Level Single-Pass Cache Simulation Methodology
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DOI：10.1109/TC.2011.194.png)
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The cache hierarchy's large contribution to total microprocessor system power makes caches a good optimization candidate. To facilitate a fast design-time cache optimization process, we propose a single-pass trace-driven cache simulation methodology-T-SPaCS-for a two-level exclusive cache hierarchy. Direct adaptation of conventional trace-driven cache simulation to two-level caches requires significant storage and simulation time as numerous stacks record cache access patterns for each level one and level two cache combination and each stack is repeatedly processed. T-SPaCS significantly reduces storage space and simulation time using a set of stacks that only record the complete cache access pattern. Thereby, T-SPaCS simulates all cache configurations for both the level one and level two caches simultaneously in a single pass. Experimental results show that T-SPaCS is 21.02X faster on average than sequential simulation for instruction caches and 33.34X faster for data caches. A simplified, but minimally lossy version of T-SPaCS (simplified-T-SPaCS) increases the average simulation speedup to 30.15X for instruction caches and 41.31X for data caches. We leverage T-SPaCS and simplified-T-SPaCS for determining the lowest energy cache configuration to quantify the effects of lossiness and observe that T-SPaCS and simplified-T-SPaCS still find the lowest energy cache configuration as compared to exact simulation.
Keyword:
Cache memories
low-power design
real-time systems and embedded systems
simulation
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