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A computer processor is very fast and is constantly reading information from
memory, which means it often has to wait for the information to arrive, because
the memory access times are slower than the processor speed. A cache memory is
a small, temporary, but fast memory that the processor uses for information it is
likely to need again in the very near future.
Noncomputer examples of caching are all around us. Keeping them in mind
will help you to understand computer memory caching. Think of a homeowner
with a very large tool chest in the garage. Suppose you are this homeowner and
have a home improvement project to work on in the basement. You know this
project will require drills, wrenches, hammers, a tape measure, several types of
saws, and many different types and sizes of screwdrivers. The first thing you
want to do is measure and then cut some wood. You run out to the garage, grab
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