What is a write buffer?

In computer architecture, there are pieces of memory known as buffers. These buffers are small and contain information that must be accessed quickly. A write buffer, which is held in the cache of the central processing unit ( CPU ), contains information that must be able to be written from the buffer to the computer’s random access memory (RAM) area. Most cache data is read and not written, so the write buffer is tiny compared to the read section of the cache. The write buffer can only handle one write request at a time, so only one data is freed when a write request is received.

A central processing unit. A write buffer is kept on the CPU.

In memory architecture, regardless of whether the memory is CPU or RAM, there is a section called cache. This represents a very small part of all memory and stores previously read data so that it can be retrieved later. By storing the information, the computer will be able to retrieve it much more quickly and easily when the user accesses it again.

A write buffer, which is stored exclusively in the CPU cache, stores information for writing. The difference between a read and write request is how the information is handled. On a read request, the information is retrieved as is, without any changes or calculations. A write request is more complicated because the information needs to be changed or calculated before it can be used.

Most requests are read requests, such as retrieving a static website or opening a previously saved document that hasn’t changed. The recording buffer helps to organize the entire buffer. Instead of having all read and write requests in one place, which can drastically slow down the cache, write information is only stored in one section so that section can work exclusively on write requests. The rest of the cache is left to work on prevailing read requests.

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In the write buffer, requests can only be handled one at a time. Instead of the read section of the cache, which handles many requests at once, the write section can only flush information for one request. This is mainly because write requests are harder to fill, so the cache needs to focus on one task.

Although the buffer can only fill one write request at a time, it still moves quickly. Write requests only need a small block of information to work and data is retrieved in milliseconds. Although slower than read requests, write requests still fill with only a small delay.

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