The memory
hierarchy system consists of all storage devices in a computer system from slow
but higher capacity auxiliary memory to a relatively faster main memory to an
even smaller and faster cache memory. The main memory occupies central position
by being able to communicate directly with CPU and with auxiliary memory
devices through an I/O processor.
When
programs not residing in main memory are needed by CPU, they are brought in
from auxiliary memory. Programs not currently needed in main memory are
transferred into auxiliary memory to provide space for currently used programs
and data. A very high speed memory called a cache is sometimes used to increase
the speed of processing by making current programs and data available to CPU at
rapid rate. Using this it is possible to increase the performance rate of
computer.
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