JPH0244438A - File area allocation system - Google Patents

Abstract

PURPOSE:To prevent the performance of file access from being lowered according to the operation of a system by performing file area allocation so as to utilize a null area in a memory device large in capacity effectively. CONSTITUTION:At the time of storing an new file in the memory device 1 large in capacity, the size of the null area 3 at a null area managing part 2 in the memory device 1 is compared with that of the file, and the null area with the size equal to that of the file is allocated as a file storage area with the highest precedence, and the one with the size larger than that of the file and also with the minimum null area as the file storage area with the second highest precedence, and the one with the size smaller than that of the file and with the maximum null area as the file storage area with the third highest precedence, and the file is stored. In such a way, it is possible to use the null area effectively, and to prevent the performance of the file access from being lowered.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a file area allocation method in a mass storage device of an information processing system.

[Conventional technology]

In a file management method that allows one file to be divided and stored in multiple segments in a mass storage device, when acquiring a new file storage area, the second
As shown in the figure, a method is generally used in which a blank area 3 is allocated as a file storage area by referring to a blank area management section 2 in a mass storage device 1.

[Problem to be solved by the invention]

Conventionally, no special restrictions have been set on the allocation of the blank area 3; for example, in order to store files from the blank area 3 at the beginning of the blank area management section 2, small files may be stored in the large blank area 3. Such cases also occur. If the system is operated in the above state, as files are repeatedly created and deleted, the blank area 3 in the storage device 1 will become fragmented, and the next time an attempt is made to acquire a file storage area, it will not fit in the largest blank area. , it will be divided into multiple segments and stored. When a certain file is divided into many segments and exists in a storage device, there is a drawback that when accessing the file, the head moves frequently and the file access performance deteriorates. An object of the present invention is to prevent a decline in file access performance that accompanies system operation by providing a file area allocation method that effectively utilizes blank areas within a mass storage device.

[Means to solve the problem]

In a file management method that allows one file to be divided and stored in multiple segments in a mass storage device, when storing a new file in the storage device,
The size of the blank area in the blank area management section in the storage device is compared with the size of the file, and the blank area with the same size as the file is given first priority as the file storage area. A file is stored by assigning a blank area that is larger than the file size and is the smallest to a second priority, and assigning a blank area that is smaller than the size of the file and the largest to a third priority.

[For use]

By allocating a blank area for storage according to the file size, the blank area can be used effectively.

[Embodiments of the invention]

FIG. 1 shows a flowchart of the allocation method according to the present invention. The explanation will be given below according to the flowchart. When acquiring a new file in the storage device, compare the size of the blank area in each blank area management section with the file size (step ■). If a blank area of the same size exists, move the file there. Store (step ■)
. If a blank area of equal size does not exist, check for the existence of a blank area larger than the file size (step ■),
If the file exists, the file is stored in the smallest blank area among them (step ①), and the rest of the blank area is used as a new blank area. If there is neither a blank area equal to the size of the file nor a blank area larger than the size of the file, store in the largest existing blank area a size large enough to store the beginning of the file in the blank area. Find the remaining area (step ■) and repeat the same process.

【Effect of the invention】

According to the present invention, by allocating a file area, it is possible to prevent a large blank area from being divided by storing a small file in the same area, and it is possible to effectively utilize the blank area.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing an embodiment of the file area allocation method according to the present invention, and FIG. 2 is a block diagram of blank area management in a storage device. 1-Mass storage device, 2-Blank area management section, 3...1
Myosoku 1 edict

Claims (1)

[Claims] In a file management method that allows one file to be divided and stored in a plurality of segments in a mass storage device, when storing a new file in the storage device, the content of the storage device is The size of the blank area managed by the blank area management unit is compared with the size of the file, and the blank area having the same size as the file is given first priority as the file storage area, and the size of the file is prioritized. A file allocation method characterized in that: a large and smallest blank area is assigned to a second priority, and a blank area that is smaller and largest than the file size is assigned to a third priority.