Analysis of Cache Memories in Highly Parallel Systems
Analysis of Cache Memories in Highly Parallel Systems
Kevin Mcauliffe
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Lastly, the 6600 has a separate normalize instruction. This anomaly has con- trasting effects. If the normalize is in a loop, the extra instruction will generate a lower miss ratio, provided the loop is held in cache. If the loop can not be held in cache or if the normalize is used in a serial code sequence, then the extra instruction may generate a higher miss ratio. Overall, the use of trace data based on programs generated on PEs consisting of 6600s will provide statistics that are sHghtly m...ore pessimistic than could be expected for a contemporary machine. However, the main purpose of the simula- tions is to provide relative performance measures so various cache policies can be analysed. 4. 2. 2. Cache Simulator The purpose of the cache simulator is to determine the miss ratio and the amount of network traffic generated by various cache organizations. Input to the simulator is a set of parameters that specify the organization of a cache and trace data (as described above). The parameters specify the cache size, line size, replace- ment algorithm, and update policy.
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