JP3012434B2 - Data re-accessless method of information processing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing system for a host computer and a terminal device, and more particularly to a data re-accessless system improved so that the same data is not accessed twice by the host computer.

[0002]

2. Description of the Related Art In a conventional information processing system, a terminal device requests necessary data from a host computer, and when data is transmitted via a communication line, the data is stored in a memory or a magnetic disk in the device. After that, data processing such as screen display and print output is performed.

[0003]

In the above conventional information processing system, when the next new data is requested from the host computer or when the memory capacity in the device exceeds the allowable amount, the data from the host computer is not transmitted. Since the data is lost, the next time the data is processed, the same data must be requested again from the host computer. Therefore, it is necessary to transfer data from a host computer via a communication line, and the data transfer on such a communication line requires time, so that there is a problem that it takes time to process data. Further, when data from a host computer is stored in a magnetic disk, it takes time to access the data, so that it takes time to display the data on a screen or print out the data.

[0004] In view of the above-mentioned conventional problems, the present invention saves data from a host computer in a plurality of data save areas, thereby reducing data re-access to the host computer and reducing data transfer time on a communication line. It is an object of the present invention to provide a data re-access-less method for an information processing system in which the data processing time can be shortened by reducing the data processing time.

[0005]

Means for Solving the Problems In a data re-access-less system of an information processing system according to the present invention, in an information processing system having a host computer and a terminal device connected to the host computer via a communication line,
The terminal device has a plurality of data save areas in which priorities are set in advance, and searches in order from a data save area having a higher priority according to a data processing request from a user. If it exists in the data save area, it is used, and if it does not exist, the host computer requests the data from the host computer. It is characterized in that the data is stored in a data save area determined to have an empty area first.

[0006]

According to the present invention, a plurality of data save areas for saving data transmitted from a host computer are provided in a terminal device, and the priority order of data save is set in the data save areas. Then, when requesting data from the host computer, a data save area is searched to check whether or not the data exists, and if so, the data is read to perform data processing. on the other hand,
If the data does not exist, the host computer requests the data and processes the data using the transmitted data. When the next data is requested, the data is assigned to the priority set in the data save area. In order to prepare for re-use of data at the time of re-request. Therefore, it is not necessary to request the host computer for the same data many times, so that the data transfer time on the communication line can be reduced and the data processing can be speeded up.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a data re-accessless system of an information processing system according to the present invention. In FIG. 1, reference numeral 10 denotes a host computer, and reference numeral 20 denotes a terminal controller connected to the host computer 10 via the communication line 2. The terminal controller 20 includes a communication processing unit 21 for performing data communication with the host computer 10 and a terminal controller disk 22 for storing received data. The terminal controller disk 22 is determined as a data save area for storing data from the host computer 10 in the third priority order.

Reference numeral 30 denotes a workstation connected to the terminal controller 20 via the local area network 3. The terminal controller 20 and the workstation 30 are connected to the host computer 10 as remote terminal devices. The workstation 30 is capable of high-speed communication, includes a data processing unit 32 for displaying data on a display 35 and outputting to a printer 36, and a workstation memory 33 for saving data received from the host computer 10. And a workstation disk 34 are provided. When saving the data received from the host computer 10, the workstation memory 33 is determined as the first priority and the workstation disk 34 is determined as the second priority data save area. The third priority data save area is stored in the terminal controller disk 22 of the terminal controller 20 as described above.
It is. Reference numeral 31 denotes a processing instruction unit for instructing the workstation memory 33, the workstation disk 34, or the terminal controller 20 to check for the existence of data or to save data when requesting data from the host computer 10.

Next, the operation of the above embodiment will be described. First, when data processing is performed in the workstation 30, data required for processing is requested from the processing instruction unit 31 to the host computer 10 by a user's instruction.
This data request is sent to the host computer 10 via the communication processing unit 21 of the terminal controller 20.
The host computer 10 retrieves data based on the data request, and transmits the retrieved data to the terminal controller 20 via the communication line 2 and further to the workstation 30 via the local area network 3. This data is stored in the data processing unit 32
, And data processing such as enlargement or reduction of an image is performed using the transmitted data. And
The data processing unit 32 outputs the result of the data processing to the display 35 or the printer 36 and ends the data processing.

When the workstation 30 requests the next necessary data and performs data processing, it is first checked whether or not the corresponding data exists in the workstation memory 33. Here, if the corresponding data exists, if the data in the data processing unit 32 has not been saved, the data is saved in accordance with the priority order, the data is read out to the data processing unit 32, and the data processing as described above is performed. .
Here, since the data has been requested only once from the host computer 10, the workstation memory 33 is in an empty state, and naturally there is no corresponding data. Therefore, at this time, workstation 3
The required data is requested from the processing instruction unit 31 of the host computer 10 to the host computer 10, and predetermined data processing is performed using the data transmitted in response to the request. in this case,
The data previously stored in the data processing unit 32 is saved in the workstation memory 33, and the data transmitted from the host computer 10 is stored in the data processing unit 32 and the data processing is performed as described above.

Next, in the case of requesting data, it is checked whether or not the corresponding data exists in the workstation memory 33 in the same manner as described above. If not, data is requested from the host computer 10 and data processing is performed. At this time, the data stored in the data processing unit 32 is similarly saved in the work station memory 33, and new data transmitted from the host computer 10 is stored in the data processing unit 32 to perform data processing. In this manner, each time data is requested, it is checked whether or not the data is present in the workstation memory 33. If the data is present, the data is read out and processed, and if not, the data is transmitted to the host computer 10. Upon request, after processing the data, the data is stored in the workstation memory 33 to be ready for subsequent data reuse.

When there is no more free space in the workstation memory 33, data from the host computer 10 is saved to the workstation disk 34 having the second save priority. Therefore, at this time, the workstation memory 33 and the workstation disk 3
The corresponding data is searched in the order of 4, and if there is the corresponding data, the data is processed using the data. On the other hand, when there is no corresponding data, the data is requested from the host computer 10, and after the data is processed, the data is stored in the workstation disk 34 so as to be ready for the subsequent reuse of the data. Also, the workstation disk 34
When there is no more free space, the terminal controller disk 22 having the third save priority is used as a data save area. At this time, when searching for necessary data, the data is searched in the order of the workstation memory 33, the workstation disk 34, and the terminal controller disk 22, and if there is such data, the data is read and the data is processed. .
If there is no corresponding data, the host computer 10
After the data is processed, the data is stored in the terminal controller disk 22 so that the data can be reused.

Further, a terminal controller disk 2
If the save area cannot be secured in the area 2, the access frequency on the workstation memory 33 is low and the oldest data is erased sequentially to secure the save area for data. Also,
At the end of the system, only the indexes of all the saved data files are erased, and the data is erased at a high speed. When the next system is started, it is used as a data save area as described above.

In this embodiment, a plurality of data save areas are provided in a terminal device, and data sent from a host computer is saved with a predetermined save priority, so that the same data is sent many times via a communication line. Since it is not necessary to perform the above, it is possible to greatly reduce the data transfer time for transmitting data via the communication line. That is, the data transfer time on the communication line accounts for a large proportion of the data processing time, but by storing the data in the data save area as described above, the data transfer time on the communication line can be reduced. Since the data processing time can be reduced, the data processing time can be significantly reduced as compared with the related art. The host computer is provided with, for example, an optical disk device as an external storage device. When a data request is made from a terminal device, the data is taken out from the external storage device and transferred to the terminal device. In such a case, saving data on the terminal device side as described above reduces the frequency of data requests and the frequency of disk replacement, thus reducing the work of the operator on the host computer side. can do.

Further, in this embodiment, since the data transmitted from the host computer is directly read into the data processing section, the access time is greatly reduced as compared with the conventional method of storing data from the host computer on a magnetic disk. It is possible to shorten the processing time and speed up data processing.

In the above embodiment, the terminal device is constituted by the terminal controller and the workstation, but the terminal device may be constituted only by the workstation. In this case, the data save area is only the workstation memory and the workstation disk.

[0017]

As described above, the present invention saves data from a host computer in a plurality of data save areas, thereby reducing data re-access to the host computer and reducing data transfer time on a communication line. This has the effect of reducing data processing time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a data re-accessless system of an information processing system according to the present invention.

[Explanation of symbols]

 2 Communication Line 3 Local Area Network 10 Host Computer 20 Terminal Controller 21 Communication Processing Unit 22 Terminal Controller Disk 30 Workstation 31 Processing Instruction Unit 32 Data Processing Unit 33 Workstation Memory 34 Workstation Disk

Claims (1)

(57) [Claims] 1. A host computer, and a terminal controller connected to the host computer via a communication line.
And a communication line to this terminal controller.
In the information processing system and a workstation connected via the workstation work
Station memory and workstation disk
And the terminal control of the terminal controller
With a data disk as a data save area
Prioritize these data evacuation areas in advance.
In advance, in response to a data processing request from a user, a search is performed in order from a data save area having a higher priority, and if the data exists in any of the data save areas, the data is used. When the data is requested from the host computer and the data is received from the host computer, the data is stored in the data save area which is searched in order from the data save area having the highest priority and which is determined to have the free space first. A data re-access-less method for an information processing system.