Calculate the effective access time for a referenced word

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Reference no: EM132144519

A system has two levels of cache L1 and L2 between processor and main memory. If a referenced word is in L1, 10 ns are required to access it. The look-up time for L2 is 20 ns. L1 hit ratio is 30% and L2 hit ratio is 50%.

When neither of the caches contains the word, main memory is checked. It takes 0.1 microseconds to look up an item in main memory, but the success rate is 80%.

The word can always be found on the disk and takes 1 millisecond to access it from disk. Calculate the effective access time for a referenced word.

Reference no: EM132144519

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