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THE IMPACT OF WRITE BACK ON CACHE PERFORMANCE

This paper quantifies the impact of write policies and allocation policies on the cache performance. Adding write back to a cache design increases hardware cost, since additional storage for dirty bits is required. Furthermore, write back is not always faster. This paper derives a criterion which allows to check easily whether write back improves the performance of a given memory system. This is done with the help of extensive cache simulations on a MIPS RISC architecture with SPEC92 benchmarks as workload.