the cache; i.e., maximum leakage to minimum leakage under variation might
be 10~100. Then, they introduce way prioritization technique to select low
leakage ways in cache management. The propose technique can approxi-
mately reduce leakage current by 20%. It is important to note that the way
prioritization technique utilize variations estimation. However, they do not
provide a fast and cheap method for the variations estimation.
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