Cache
memory:
It is very
fast memory located in between processor and RAM. The CPU uses cache memory to
store instruction and data that are repeatedly required to run programs,
improving overall system speed .when an information is required by the
processor, first it will look up in cache memory, and if it is not available in
the cache then it will fetch if from the RAM.
Purpose
of cache memory:
The main purpose
of cache memory is to eliminate the speed difference between processor register
and main memory.
Levels
of cache memory:
·
L1
(level 1 cache)
·
L2
(level 2 cache)
·
L3
(level 3 cache)
L1
cache:
L1 cache is
built into the actual processor core. A processor core is a processing unit
which read instruction to perform specific actions.
It is a part
of high speed memory which operate at high speed as CPU. It is very expensive
and can store very limited data i.e., 8 to 128 kbytes . it holds data that
processor needs to execute instructions.
L2
cache:
L2 cache
pulls information from RAM , which is then accessed by the l1 cache. It is bigger
in size and slow er in speed then l1 cache. it can store up to 16 mb data and
instruction.
The basic
purpose of l2 cache is to regularly read somewhat large quantities of data from
RAM which is then available in l1 cache.
L3
cache:
L3 cache is
a specialized memory that worked hand in hand with l1 and l2 cache to improve
computer performance. It is the largest
cache and faster than ram but slower than l1 and l2 cache.l3 cache has typically been built
into the motherboard while l1 an l2 cache are built into processor .processor
firs look for instruction in l1 cache, and
then it checks l2 and l3 cache respectively.
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