| 摘要 |
<p>PURPOSE:To efficiently use a data transfer path even when respective input/ output devices having deviation in access frequency by determining whether a pre-reading and batch writing schedule process by an input/output device which is scheduled at the current point or a process by another input/output device is performed at a next schedule point according to the operation state. CONSTITUTION:A next schedule point of time is set a preprocessing time before the time when the pre-read and batch write data transfer process scheduled at the current schedule point of time ends, and it is determined at the next schedule point of time which of the pre-reading and batch writing schedule process by the input/output device scheduled at the current point and the pre- reading and batch writing schedule process by another input/output device is performed. Consequently, even if respective input/output devices have deviation in access frequency, the data transfer path between the input/output devices and a controller which controls them is used efficiently and the pre-reading and batch writing of data are realized with the smallest buffer size.</p> |
