Buffer storage control system.

摘要

In a storage hierarchy system, a part of data stored in a main storage is held as a copy by a buffer storage (61) of a smaller capacity and higher speed than the main storage. A processor fetches data from the buffer storage (61) or stores data in the buffer storage (61) at a high speed. A buffer storage control system includes a first buffer directory (44) and a second buffer directory (54). The first buffer directory (44) and the buffer storage (61) are accessed by an address for a fetch request (40), while the second buffer directory (54) and the buffer storage (61) are accessed by an address for store request (50), whereby competition for the access to the buffer storage between the fetch and store operations is reduced.