JPH06214845A - System for simultaneously processing plural blocks - Google Patents

Abstract

PURPOSE:To transport a conventional application program interface to a system for handling only the data stream without changing the interface and to improve throughput by reducing the number of times of inputting to a magnetic disk. CONSTITUTION:At an electronic computer 13, an application program 11 and a block input program 12 are operated. A parameter 16 dispatched from the application program 11 is analyzed by the block input program 12, and data are simultaneously inputted from a magnetic disk 14. Thus, the application program interface can be transported to the system for handling only the data stream without being changed. Further, the throughput can be improved by reducing the number of times of I/O with the magnetic disk 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method relating to the transfer of an application program in a file system that handles only stream data and the data stored on a magnetic disk.

[0002]

2. Description of the Related Art FIG. 4 is a diagram for explaining a method of inputting a block stored on a conventional magnetic disk. In FIG. 4, 41 indicates an application program, 4
Reference numeral 2 is a block input program, and 43 is an electronic computer that executes these programs. Reference numeral 44 is a magnetic disk that stores data, and includes 45a, 45b, 45c, 45
d indicates n data blocks stored on the magnetic disk.

Next, the operation will be described. When an input request from block 0 to block 2 is made from the application program 41 to the block input program 42, the block input program 42 causes the block 0 (45a), block 1 (45b), block 2 to be transmitted from the magnetic disk.
I / O is performed three times for each block in the order of (45c), and the input result is passed to the application program.

[0004]

However, it is impossible to apply the conventional method to a system that can handle only stream data.
Remodeling was necessary.

It is an object of the present invention to apply to a system that handles only a data stream while improving the input performance without changing the application program interface.

[0006]

In order to achieve the above object, stream data is virtually divided into blocks of the same length and managed, and n times the block length is input as one input unit from a magnetic disk. With this, the conventional application program interface is guaranteed, the number of inputs is reduced, and the performance is improved.

[0007]

In a system that can handle only stream data, the conventional application program can be used as it is by recompiling it. Further, the number of input requests of the magnetic disk is reduced as compared with the conventional execution, and the performance can be improved.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of the configuration of a system according to the present invention. The block input program 12 is called for block input from the application program 11 operating on the electronic computer 13. At this time, the parameter 16 instructing the block input program 12 to input three blocks from block 0 (15a) is passed. The block input program 12 analyzes the parameter 16 and inputs data from the magnetic disk 14. The data on the magnetic disk 14 is byte stream data (18), and assuming that the block input program 12 is virtually divided into blocks, block 0 (15a), block 1 (15b), block 2 ( The data for the length of 15c) is input by one I / O (17). Then, the data is transferred to the input area designated by the parameter 6 and the process returns to the calling point of the application program 1.

FIG. 2 shows an application program 11
6 is a diagram showing a format of a parameter 16 passed from the block input program 12 to the block input program 12. Reference numeral 21 designates an input block number (22a) and an input block number (22b) in a continuous area. 23 designates the number of combinations of the block number (22a) and the block number (22b) designated in 21. 24 and 25 specify the input area length and the input area address, respectively.

FIG. 3 is a flow chart of processing of the block input program 12. When control is passed from the application program 11 together with the parameter 16 to the block input program, n block numbers (22
The minimum value and the maximum value + the number of blocks are obtained from a) and the block range to be input is determined. (31) The calculated block range × block length is calculated to calculate the input data length (32) and the calculated minimum value × block length is calculated to determine the data input position on the magnetic disk (14). (33) Depending on the input data length and the data input position, the magnetic disk (1
Input the data from 4). (34) The input data is transferred to the area of the input area address 25 designated according to the designation of the parameter 16. (35) According to this embodiment, stream data can be handled by the same interface as a conventional CKD (count key data) type magnetic disk. Moreover, since n blocks are executed by one I / O, there is an effect of improving processing performance.

[0012]

According to the present invention, an application program can be used without changing the interface.
It can be ported to a system that handles only stream data, and has the effect of improving the processing performance during program execution.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a system according to the present invention.

FIG. 2 is a diagram for explaining an interface in the embodiment.

FIG. 3 is a diagram for explaining a block input program in the embodiment.

FIG. 4 is a diagram showing a configuration example of a conventional system.

[Explanation of symbols]

 11 ... Application program, 12 ... Block input program, 13 ... Electronic computer, 14 ... Magnetic disk for storing data.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kunio Nashimoto Inventor, 6-81, Onoe-machi, Naka-ku, Yokohama-shi, Kanagawa Hitachi Software Engineering Co., Ltd. (72) Inventor Takeo Itai, 6-81, Onoue, Naka-ku, Yokohama, Kanagawa Address Hitachi Software Engineering Co., Ltd. In-house (72) Inventor Atsushi Suzuki 6-81, Onoue-cho, Naka-ku, Yokohama-shi, Kanagawa Hitachi Software Engineering Co., Ltd. In-house

Claims (1)

[Claims] 1. In a file system that handles only stream data, in a system that realizes a pseudo direct organization file in which stream data is divided and managed as a block of a fixed length and directly accessible from the application program, A multi-block batch processing method that uses a parameter interface to pass multiple blocks to the application program at one time as one input / output unit.