JPH0293826A - Double buffer input control system - Google Patents

Abstract

PURPOSE:To prevent input data from omission without fail when the continuous high speed data of large capacity are inputted and analysis processing is executed by providing double buffers which are realized by a hardware, between a data input interface device and a data processor. CONSTITUTION:A data input interface device 1 executes the input of the data from a data originating source and double buffers 21 and 22 for data input interface device alternatively execute the tentative accumulation of the data from the data input interface device 1. A data processor 3 alternatively inputs the data transferred from the double buffers 21 and 22 for data input interface device at each prescribed time to double buffers 31 and 32 for data processor and analyzes the data. Thus, when the high speed data of the large capacity are inputted, the data are prevented from omission and the reliability of an on-line system can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a double buffer input control method, and more particularly to a double buffer input control method in an online system used for analysis processing of measurement data.

[Conventional technology]

Conventionally, in online systems that input and analyze continuous high-speed, large-volume data, as shown in FIG. was constantly input to the data processing device 5. Data processing device 5
Now, by using two input buffers, a working buffer 51 and a standby buffer 52, which are implemented by software, data that is constantly input is input to one input buffer within the time that data is input to the other input buffer. By analyzing the data, data loss was prevented and the credibility of the online system was improved.

[Problem to be solved by the invention]

In the conventional double buffer input control method described above, two input buffers, the current buffer 51 and the 1Htl buffer 52, are realized in the data processing device 5 by software, so the input buffer can be changed from one input buffer to the other. Buffer switching processing by software operates when switching to the cover sofa, but data transfer from the data input interface device 4 to the data processing device 5 is performed continuously during this buffer switching processing. The disadvantage is that data transferred during the transfer may be lost.

In view of the above-mentioned points, an object of the present invention is to provide a double buffer realized by hardware between a data input interface device and a data processing device to prevent data loss when inputting high-speed large-capacity data. An object of the present invention is to provide a double buffer input control method that improves page reliability of an online system.

[Means for Solving the Problems] The double-buffer input control method of the present invention is such that, in an online system, a data input interface device that inputs data from a data source and a data input interface device that temporarily temporarily inputs data from the data input interface device alternately. a data processing device that alternately inputs data transferred from the double buffer for the data input interface device at predetermined time intervals into the double buffer for the data processing device and analyzes the data; has.

[Effect]

In the double buffer input control method of the present invention, a data input interface device inputs data from a data source, and a double buffer for the data input interface device temporarily stores data from the data input interface device alternately and performs data processing. The device alternately inputs data transferred from the double buffer for the data input interface device at predetermined time intervals to the double buffer for the data processing device and analyzes the data.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a double buffer input control system according to an embodiment of the present invention.

The double buffer input control method of this embodiment includes a data input interface device 1 and a current buffer for the data input interface device (hereinafter abbreviated as B1 buffer) 2.
1, a standby buffer for the data input interface device (hereinafter abbreviated as B2 buffer) 22, and a current buffer for the data processing device (hereinafter abbreviated as B3 buffer).
31 and a standby buffer for the data processing device (hereinafter referred to as B
The main part of the data processing device 3 is composed of a data processing device 3 including a 4-buffer (abbreviated as 4 buffers) 32.

Note that the Bl buffer 21 and the B2 buffer 22 are realized by hardware, and the B3 buffer 31 and the B2 buffer 22 are realized by hardware.
The four buffers 32 are realized by software.

Furthermore, the data transfer speed of the data transfer path between the B1 buffer 21 and B2 buffer 22 and the data processing device 3 is the same as that of the data input interface device 1 and the B1 buffer 21.
The data transfer speed is higher than that of the data transfer path between the data transfer path and the B2 buffer 22.

Referring to FIG. 2, the processing in the data processing device 3 includes a step 101 of inputting instructions to the B3 buffer, a step 102 of inputting data to the B3 buffer, a step 103 of switching from the B3 buffer to the 84 buffer, and a step 103 of switching the B3 buffer to the 84 buffer. Data analysis step 104, B3 buffer post-processing step 105, B3 buffer input instruction step 106, B4 buffer input instruction step 2
01, data input step 202 to B4 buffer, and step 2 of switching from B4 buffer to 83 buffer.
03, a B4 buffer data analysis step 204, a B4 buffer post-processing step 205, and an input instruction step 206 to the B4 buffer. In addition, the second
Steps drawn in the same vertical position in the figure can be processed in parallel almost simultaneously in the data processing device 3.

Referring to FIG. 3, if time a, b, c, and d are required for data input, buffer switching, data analysis, and post-processing in the data processing device 3, then a + b
<t and c+d<t hold true. Note that the time t is B
The time (seconds) that the 1 buffer 21 and the B2 buffer 22 can store input data, that is, the B1 buffer 21 and the 8
2 shows the time during which the two buffers 22 are alternately switched.

Next, the operation of the double buffer input control system of this embodiment configured as described above will be explained.

The data input interface device 1 does not transfer the data that has been continuously generated and transferred at the data source to the data processing device 3, for example, in the B1 buffer 21.
After 0 seconds, the data is transferred from the B1 buffer 21 to the data processing device 3 and the data input ink is stored from the face device I to the 82 buffer 22 at the same time, and the data is transferred from the B1 buffer 21. and B2
Data storage into the buffer 22 is started. Subsequently, after another second, a transfer instruction is sent from the 82 buffer 22 to the data processing device 3 and from the data input interface device 1 to B1.
A storage instruction is given to the buffer 21 at the same time, and data transfer from the B2 buffer 22 and data storage to the B1 buffer 21 are started. Thereafter, the process is repeated alternately in the same manner.

The data processing device 3 first gives a manual instruction to the B3 buffer 31 and an input instruction to the B4 buffer 32 (steps 101 and 201). Next, as shown in FIG. After inputting data to the buffer 31 (step 102) and switching from the B3 buffer 31 to the 84 buffer 32 (step 103) within one second, the data processing device 3 analyzes the data in the B3 buffer 31 (step 104). ), post-processing of the B3 buffer 31 (step 105), input instruction to the B3 buffer 31 (step 106), data input to the B4 buffer 32 (step 202), and switching from the B4 buffer 32 to the 83 buffer 31 (step 203) in parallel within 1 second.Furthermore, in the data processing word 3, data is manually transferred to the B3 buffer 31 (step 102) and switching from the B3 buffer 31 to the 84 buffer 32 (step 103); B4 buffer 3
2 data analysis (step 204), B4 buffer 32
The post-processing (step 205) and the input instruction to the B4 buffer 32 (step 206) are performed in parallel within one second. Thereafter, the process is repeated in the same manner.

〔Effect of the invention〕

As explained above, the present invention further provides a double buffer realized by hardware different from the double buffer realized by the software of the data processing device between the data input interface device and the data processing device. It is possible to reliably prevent input data from being lost during continuous high-speed, large-capacity data input and analysis processing, and this has the effect of improving the reliability of the online system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a double buffer input control system according to an embodiment of the present invention, FIG. 2 is a flowchart showing the processing in the data processing device in FIG. 1, and FIG. FIG. 4 is a diagram showing an example of a conventional double buffer input control method. In the figure, 1... data input interface device, 3... data processing device, 21... active buffer for data input interface device (Bl buffer), 22... standby buffer for data input interface device (B2 buffer), 31... Current buffer for data processing device (B3 buffer), 32... Standby buffer for data processing device (B4 buffer).

Claims (1)

[Claims] In an online system, a data input interface device inputs data from a data source; a double buffer for the data input interface device that alternately temporarily stores data from the data input interface device; A double buffer input control system comprising: a data processing device that alternately inputs data transferred from a double buffer for a data input interface device at predetermined time intervals to a double buffer for a data processing device and analyzes the data.