What Is CPU Cache And What Is It Used For, What is cache - 28 April

What Is CPU Cache And What Is It Used For, What is cache - 28 April 

What is CPU cache and what does it do? This is covered in this post. A central processor is another name for a central processing unit (CPU). It is also known as the main processor or simply the processor. The CPU is the electronic circuitry that executes computer program instructions. The CPU does the following:

a) Basic arithmetic.

b) Logic.

c) Controlling.

d) and lastly, input/output (I/O) operations specified by the instructions in the program.

This differs with external components such as main memory and I/O circuitry, and specialized processors such as graphics processing units (GPUs).

What is CPU cache

A CPU cache is a hardware cache used by a computer's central processing unit (CPU) to reduce the average cost (time or energy) of accessing data from main memory. A cache is a smaller, faster memory that is located near the processor core. It keeps duplicates of data from frequently used main memory locations. Most CPUs have a cache hierarchy of multiple levels (L1, L2, frequently L3, and rarely L4), with different instruction-specific and data-specific caches at level 1.

What is CPU cache used for?

When the processor needs to read from or write to a location in main memory, it first checks the cache to see if a copy of that data exists. If this is the case, the processor immediately reads or writes to the cache, which is much faster than reading or writing to main memory.

Most modern desktop and server CPUs include at least three independent caches: an instruction cache for faster executable instruction fetch, a data cache for faster data fetch and store, and a translation lookaside buffer (TLB) for faster virtual-to-physical address translation for both executable instructions and data. The data cache is typically organized as a hierarchical structure with multiple cache levels (L1, L2, etc).

Working memory is the actual data that your application uses (as well as a copy of the executable itself; which in the old days you were freely able to modify at runtime). As a computer user, this is the only thing you need to be concerned about. It is stored in your computer's main memory, which is (almost always) a different physical object.

The caches in this section are all on your CPU (which is why they are faster for your CPU to access than RAM modules, which is where it must look if it can't find what it needs in the cache).

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