The performance of cache memory is frequently measured in terms of a quantity called Hit ratio.
For a cache miss, the cache allocates a new entry and copies in data from main memory, then the request is fulfilled from the contents of the cache. If the processor does not find the memory location in the cache, a cache miss has occurred.If the processor finds that the memory location is in the cache, a cache hit has occurred and data is read from cache.When the processor needs to read or write a location in main memory, it first checks for a corresponding entry in the cache. It is external memory which is not as fast as main memory but data stays permanently in this memory. It is small in size and once power is off data no longer stays in this memory. It is memory on which computer works currently. It is the fastest memory which has faster access time where data is temporarily stored for faster access. Most commonly used register is accumulator, Program counter, address register etc. It is a type of memory in which data is stored and accepted that are immediately stored in CPU. There are various different independent caches in a CPU, which store instructions and data. The cache is a smaller and faster memory which stores copies of the data from frequently used main memory locations. ISRO CS Syllabus for Scientist/Engineer ExamĬache memory is used to reduce the average time to access data from the Main memory.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.
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