Cache memory is a high-speed, small-sized type of volatile computer memory that plays a crucial role in improving CPU (Central Processing Unit) performance. It serves as a bridge between the CPU and the slower, larger main memory (RAM). The CPU registers form part of the cache memory.
The primary purpose of cache memory is to reduce the time it takes for the CPU to access frequently used data and instructions, thereby enhancing overall system performance.
Cache memory is static ram (SRAM) that stores its data in flop flop circuits.
Cache memory operates at a higher compared to the main memory.
Cache Hits & Misses
A cache hit occurs when the CPU requests a piece of data or instruction, and that data is found in the cache memory. In other words, the data needed by the CPU is already present in the cache.
A cache miss occurs when the CPU requests data or instructions that are not present in the cache memory. In this case, the cache does not contain the required data, and the CPU must fetch it from a slower memory hierarchy level, typically from the main memory (RAM).
Cache hits are desirable because they result in very fast memory access times. The CPU can retrieve the required data directly from the cache, avoiding the longer latency associated with accessing data from main memory (RAM) or even slower storage devices like hard drives or SSDs.
What happens when a requested data is not found in cache memory?
Pros & Cons of Cache Memory
Advantages
Cache memory is faster than RAM memory because it is located directly on the CPU using flip-flop circuits.
Disadvantages
Cache memory is more expensive than RAM because the circuitry is more complex than RAM.
It is also more energy intensive, due to the flip flop circuits being constantly active.
How does cache memory improve computer performance?
