Multiple Level Cache Performance Improvement Method

Distributed or parallel system is known for their performance. To improve the performance of an I/O system, there is a great demand in multilevel cache over a single cache because of its efficiency. Many policies of multilevel cache are present still there is a performance issue. 1) These policies fail to select optimally cache block for replacement i.e. fail to select a victim and 2)increases redundancy causes cache pollution at lower level. These policies include LFU, LRU-K, PROMOTE, DEMOTE, Multi Queue (MQ). In this paper we introduced Reputation cache management policy which will address drawbacks of above defined policies by considering three factors together to replace or update cache block in a multilevel cache hierarchy, secondly it prevents cache pollution at lower level cache. First factor is recency of object in a cache i.e. how nearly object is used, second is frequency i.e. How repeatedly promotion and demotion of cache block takes place in a cache. Third is considering object size, the object with largest block size and less recency and frequency will be evicted first. This policy is capable of selecting a cache block efficiently and thus gives higher hit ratio compared to other present multilevel cache policies.