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CPU Performance (Cache Memory (To overcome this, there are different…
CPU Performance
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Number of Cores
Multiple cores work on the same program together (parallel processing) or cores can work on different programs at the same time (multi-tasking).
Doubling the number of cores will double the number of instructions executed per second, but not necessarily double the speed of the computer.
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Cache Memory
Cache can contain recently or frequently used programs/data. CPU can check cache first. If it is in cache it doesn't have to wait to get it from RAM.
Speed of computers is often limited by speed of RAM. One solution is to use smaller amounts of very fast RAM (cache memory) with dedicated connections to the CPU (too expensive for all memory to be this).
However - the larger the cache memory, the slower it becomes to find instructions and data in it.
While memory (RAM) is faster than the hard disk drive it is SLOW compared to how quickly the processor can F-D-E.
To overcome this, there are different levels of cache memory:
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Level 2 cache is larger, further from the CPU and slower than L1, but still much faster than pulling something from main memory (RAM).
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