cache.pptx
- 2. • Cache Memory- • • Cache memory is a Random Access Memory. • The main advantage of cache memory is its very fast speed. • It can be accessed by the CPU at much faster speed than main memory.
- 3. • Location- • • Cache memory lies on the path between the CPU and the main memory. • It facilitates the transfer of data between the processor and the main memory at the speed which matches to the speed of the processor.
- 5. • Purpose- • • The fast speed of the cache memory makes it extremely useful. • It is used for bridging the speed mismatch between the fastest CPU and the main memory. • It does not let the CPU performance suffer due to the slower speed of the main memory.
- 6. • Execution Of Program- • • Whenever any program has to be executed, it is first loaded in the main memory. • The portion of the program that is mostly probably going to be executed in the near future is kept in the cache memory. • This allows CPU to access the most probable portion at a faster speed.
- 7. • Multilevel Cache Organization- • • A multilevel cache organization is an organization where cache memories of different sizes are organized at multiple levels to increase the processing speed to a greater extent. • The smaller the size of cache, the faster its speed. • The smallest size cache memory is placed closest to the CPU. • This helps to achieve better performance in terms of speed.
- 8. L1 Working • If the computer processor can find the data it needs for its next operation in cache memory, it will save time compared to having to get it from random access memory. • L1 is "level-1" cache memory, usually built onto the microprocessor chip itself. For example, the Intel MMX microprocessor comes with 32 thousand bytes of L1.
- 9. L2 • L2 (that is, level-2) cache memory is on a separate chip (possibly on an expansion card) that can be accessed more quickly than the larger "main" memory. A popular L2 cache memory size is 1,024 kilobytes (one megabyte).
- 10. L3 • A Level 3 (L3) cache is a specialized cache that that is used by the CPU and is usually built onto the motherboard and, in certain special processors, within the CPU module itself.
- 11. • There are CPUs which have the L1 cache on die and the L2 cache on a separate die on the same chip or even on a separate chip, or there are CPUs which have both L1 and L2 cache on the same die as the CPU core.
- 12. • There are multi-core, multi-chip CPUs where each core has its own L1 cache on die, the 4 cores of one multi-core chip share an L2 cache that is on chip, but on a separate die, and the 2 chips share an L3 cache that is on a separate chip, but in the same package.