What is cold buffer?
A cold buffer is a segment of computer memory that is reserved for temporary data storage that was not recently accessed or was recently used. A cold buffer could also refer to an area of memory that has not recently been written. The concept of cold buffer is related to the data structure used for storage management schemes, such as the Least Recently Used (LRU) policy.
Modern operating systems often use efficient memory management schemes such as segmentation and paging. In paging, the process is divided into pages and the memory is divided into frames. The pages are arranged in frames according to the requirements of the process. The segmentation follows a similar mechanism. Only a subset of the pages that are necessary for the execution of a process need to be stored in main memory; The other pages are on secondary storage. However, the cost of accessing a page from secondary storage is too high, so a buffer is retained. The buffer uses an algorithm like the LRU page policy, where the buffer only stores pages that are frequently referenced by the application. This is because the inherent nature of the application dictates that certain parts be accessed more often than others.
The buffer stores the last accessed page on the top, while other pages are pushed down each time a new entry is made in the buffer. The top of the buffer contains memory addresses that are regularly accessed and is referred to as the hot buffer, while the bottom of the buffer contains memory addresses that have not been accessed for some time and are therefore known as the cold buffer.