JPH10154089A - File input-output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform direct search input-output processing at a high speed by using an input/output buffer. SOLUTION: When a program 20 which performs direct search input/output processing is initially executed, the record number of a record that is made an input/output request is outputted to a record number output file 52. A user examines what tendency the record access order of the program 20 has based on the content and searches arrangement information that matches the tendency. For example, in the case of the tendency of a descending order, the user searches arrangement information which instructs that the record which is made an input/output request and a record of prescribed numbers which exists in just front of it are arranged in an input/output buffer 45. When the program 20 is executed at the second and succeeding times, the arrangement information is set in an area 43. Therefore, an input/output processing means 30 arranges records according to arrangement information when a record which is made an input/output request is not arranged in an input-output buffer 45.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file input / output device, and more particularly to an input / output buffer that can efficiently perform input / output processing even in the case of performing direct search input / output processing. It relates to a file input / output device.

[0002]

2. Description of the Related Art Conventionally, in input / output processing at the time of executing a program, in order to speed up the processing, generally,
An input / output buffer that mediates between the program and the file is provided on the main storage device, and the input / output of the file is performed by using the input / output buffer (for example, “Introduction to Operating System”, P128 to P130, Showa 6
April 1, 1st, 20th printing issued, NEC Information Processing Education Division, published by Japan Management Association.

By using an input / output buffer, the speed of the input / output processing called sequential search input / output can be increased. However, in the input / output processing called direct exploration input / output, the input / output processing between the input / output buffer and the file frequently occurs because the program performs input / output for an arbitrary record. It is difficult to speed up the processing.

Therefore, in order to speed up the direct search input / output processing, for example, a technique described in Japanese Patent Application Laid-Open No. Hei 6-110669 has been proposed. In this conventional technique, the direct search input / output processing is speeded up by inputting all the data in the file once into a main storage device and performing input / output processing with the data on the main storage device. I'm trying.

[0005]

The conventional technique described above requires an area on the main storage device that is equal to or larger than the size of the file to be subjected to direct search input / output processing. There is a problem that there is. Generally, the size of a main storage device provided in a computer system is much smaller than the size of an external storage device, and a situation in which the above-described conventional technology cannot be applied is likely to occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a file input / output device that can perform direct search input / output processing at high speed using an input / output buffer.

[0007]

In order to achieve the above object, the present invention provides a file input / output device for performing input / output processing for a user file via an input / output buffer. If the record requested by the input / output processing by the program performing the direct search input / output processing is not arranged in the input / output buffer, what kind of record including the input / output requested record is stored in the input / output buffer Input / output buffer data arrangement analysis means for setting arrangement information indicating whether to arrange in accordance with a user's instruction, and outputting a record number of a record input / output requested by the program to the record number output file; Records requested by the program for input / output are placed in the input / output buffer. If not, input / output processing means for arranging a plurality of records including the input / output requested record in the input / output buffer in accordance with the arrangement information set by the input / output buffer data arrangement analysis means. .

In this configuration, when executing a program for performing direct search input / output processing, when the program requests input / output of a record, the input / output processing means causes the record number output file to store the input / output request of the record. Output record number. As a result, the record number output file stores information indicating the order in which the programs accessed the records.

After the execution of the program, the user checks the tendency of the program in the order of record access based on the record number stored in the record number output file, and arranges the program according to the tendency. Ask for information. For example, if the record access order tends to be in ascending order, arrangement information indicating that a record requested to be input / output and a predetermined number of records immediately after the input / output request are arranged in the input / output buffer is obtained. Also, for example, if the record access order tends to be in descending order,
Arrangement information for instructing to arrange an input / output requested record and a predetermined number of records existing immediately before it in an input / output buffer is obtained.

When re-executing the above-mentioned program, the input / output buffer data arrangement analyzing means sets the arrangement information corresponding to the record access order of the program, and the input / output processing means executes the input / output by the program. If the requested record is not placed in the input / output buffer, a plurality of records including the record requested to be input / output are placed in the input / output buffer according to the placement information set by the input / output buffer data placement analysis means. .

According to the present invention, in order to prevent a useless record number output process from being performed, record number output availability information indicating whether or not to output a record number to the record number output file is provided by a user. The record number output request analysis means for setting according to the instruction of the above, and the input / output processing means, wherein the record number output enable / disable information set by the record number output request analysis means indicates that a record is output Only, a configuration is provided in which the record number of the record input / output requested by the program is output to the record number output file.

In this configuration, at the time of the first execution of the program, the user sets the record number output enable / disable information for instructing the output of the record number using the record number output request analysis means. Therefore, at the time of the first execution of the program, the input / output processing means outputs the record number of the record requested for input / output to the record number output file.

After the end of the first execution of the program, the user, based on the record number stored in the record number output file, operates as described above to determine the arrangement information suitable for the record access order of the program. Ask for.

At the time of the second and subsequent executions of the program, it is not necessary to collect record numbers because the arrangement information of the program has already been obtained.
Therefore, in the second and subsequent executions of the program, the user sets the record number output enable / disable information indicating that the record number is not output, using the record number output request analysis means. As a result, it is possible to prevent a useless record number output process from being performed.

The present invention further comprises an input / output buffer size analyzing means for setting input / output buffer size information indicating the size of the input / output buffer in accordance with a user's instruction, in order to further speed up the input / output processing. The input / output processing means has a configuration for securing an input / output buffer of a size indicated by the input / output buffer size information set by the input / output buffer size analysis means on the main storage device.

In this configuration, at the end of the first execution of the program, the user obtains the optimum size of the input / output buffer based on the record number stored in the record number output file. Then, at the time of the second or subsequent execution of the program, the user sets the above-mentioned optimal buffer size by using the input / output buffer size analyzing means. As a result, the input / output processing means secures the input / output buffer of the optimum size on the main storage device, and records are input / output via the input / output buffer.

Further, according to the present invention, even if a program has a different record access order between an input request and an output request, the program can execute a user file via an input / output buffer in order to perform input / output processing at high speed. In a file input / output device that performs input / output processing, a record number output file and a record requested by a program that performs direct search input / output processing on the user file are not arranged in the input / output buffer At the same time, input arrangement information indicating what record including the record requested to be input is to be arranged in the input / output buffer is set according to a user's instruction, and the record requested to be output by the program is If it is not located in the entry output buffer, Input / output buffer data arrangement analysis means for setting output arrangement information indicating whether such a record is arranged in the input / output buffer in accordance with a user's instruction, a record number of a record input / output requested by the program, and Is the one requested for input?
When the input / output type information indicating whether or not the output is requested is output to the record number output file, and the record requested by the program is not arranged in the input / output buffer, the input / output buffer A plurality of records including the input-requested record are arranged in the input / output buffer according to the input arrangement information set by the data arrangement analyzing means, and the record requested to be output by the program is arranged in the input / output buffer. If not, an input / output processing means for arranging a plurality of records including the record requested to be output in the input / output buffer in accordance with the output arrangement information set by the input / output buffer data arrangement analyzing means.

In this configuration, when the program for performing the direct search input / output processing requests the input / output of a record when the program is executed, the input / output processing means determines the record number of the record requested for input / output and the record number of the record. Is output to the record number output file, indicating input / output type information indicating whether the input request or the output request has been issued.

After the execution of the program, the user inputs the record number stored in the record number output file,
Based on the input / output type information, the tendency of each record access at the time of the input request and the output request of the program is examined, and the input arrangement information and the output arrangement information corresponding to the tendency are obtained.

At the time of re-execution of the program, the user uses the input / output buffer data layout analysis means to input input information and output layout information matching the order of record access at the time of input processing and output processing of the program. Is set. The input / output processing means includes, when the record requested by the program is not arranged in the input / output buffer, the record requested by the input according to the input arrangement information set by the input / output buffer data arrangement analyzing means. When a plurality of records are arranged in the input / output buffer, and the requested record is not arranged in the input / output buffer, the output request is issued according to the output arrangement information set by the input / output buffer data arrangement analyzing means. Place multiple records, including records, in the I / O buffer.

[0021]

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

FIG. 1 is a block diagram of an embodiment of the present invention. An option analyzing means 10, a program 20 described in a FORTRANF language, and an input / output processing means 30
, A main storage device 40, and an external storage device 50.

The option analyzing means 10 comprises a record number output request analyzing means 11, an input / output buffer size analyzing means 12, and an input / output buffer data arrangement analyzing means 13.

The program 20 includes an OPEN statement 21, a direct search input statement 22, and a direct search output statement 23.

On the main storage device 40, first to third areas 41 to 43, a user data area 44, and an input / output buffer 45 are provided.

On the external storage device 50, a user file 51 and a record number output file 52 are stored.

The record number output request analyzing means 11 indicates whether or not to output the record number of the record input / output requested by the direct search input / output statement to the record number output file 52. It has a function of setting the output availability information in the first area 41 on the main storage device 40.

The input / output buffer size analysis means 12 outputs the input / output buffer 4 to be reserved specified by the user.
5 is set in the second area 42 on the main storage device 40.

Input / output buffer data arrangement analysis means 13
Is an arrangement indicating what records are to be arranged in the input / output buffer 45, including the records requested to be input / output, when the record requested by the program 20 is not arranged in the input / output buffer 45. It has a function of setting information in a third area on the main storage device 40 in accordance with a user's instruction.

The input / output processing means 30 has a function of reserving an input / output buffer 45 in the main storage device 40 when the OPEN statement 21 in the program 20 is executed.
A function of outputting the record number and input / output type information of the record requested to be input / output at the time of execution of the direct search input statement 22 to the record number output file 52;
4. It has a function of exchanging records between the input / output buffer 45 and the user file 51.

FIG. 2 is a flow chart showing a processing example of the option analysis means 10, FIG. 3 is a flow chart showing a processing example of the input / output processing means 30 when executing an OPEN statement, and FIG. 4 is an input / output processing when executing a direct search input statement. FIG. 5 is a flowchart showing a processing example of the input / output processing means 30 at the time of executing a direct search output sentence, and FIG. 6 shows a processing example of the input / output processing means 30 at the time of record number output processing. This is a flowchart, and the operation of this embodiment will be described below with reference to the drawings.

Before executing the program 20, the user uses an input device (not shown) such as a keyboard to store a record in a specific area (not shown) on the main storage device 40 or the external storage device 50. Set number output availability information, input / output buffer size information, and placement information.

At this time, when the program 20 is executed for the first time, the user sets a record number output enable / disable information instructing the output of the record number, and sets the input buffer size information and the arrangement information in advance. Set what indicates the buffer size and layout method used. here,
What sets the record number output enable / disable information that instructs the output of the record number depends on the size of the input / output buffer 45 and how the input / output requested record is not arranged in the input / output buffer 45. This is for collecting information necessary for determining whether a new record is to be placed in the input / output buffer 45.

On the other hand, if the information about the program 20 has already been collected in the record number output file 52, not at the first execution of the program 20, the record number output indicating that the record number is not output The availability information is set in the specific area described above. Also,
As the input / output buffer size information and arrangement information, information indicating the optimum buffer size and data arrangement method determined based on the record number in the record number output file 52 is set.

When the user sets the above information,
A start instruction is given to the option analyzing means 10. As a result, the record number output request analysis means 11 in the option analysis means 10 operates, and as shown in the flowchart of FIG. 2, the record number output availability information set in the specific area is stored in the main storage device 40. Is set in the first area 41 (step S1).

Next, the input / output buffer size analyzing means 1
2 operates, and sets the output buffer size information indicating the size of the input / output buffer 45 set in the specific area in the second area 42 on the main storage device 40 (step S2).

Finally, the input / output buffer data arrangement analyzing means 13 operates, and the arrangement information indicating the data arrangement method set in the specific area is stored in the main storage device 40.
It is set in the upper third area 43 (step S3).

Thereafter, the program 20 starts executing,
OPEN statement 2 requesting opening of user file 51
1 is requested, the input / output processing means 30 causes the second area 4 on the main storage device 40 to be accessed as shown in the flowchart of FIG.
The input / output buffer size information set to 2 is read (step S11), and the input / output buffer 45 of the indicated size is secured in the main storage device 40 (S12).

Thereafter, when execution of the direct search input sentence 22 to the user file 51 is requested by the program 20, as shown in the flowchart of FIG.
Checks whether the requested record is located in the input / output buffer 45 (step S21).

Then, if they are arranged (step S
In the case of (yes at 21), after the input requested record is read from the input / output buffer 45 into the user data area 44 (step S24), a record number output process shown in FIG. 6 is performed (step S25). On the other hand, if they are not arranged (step S21 is no), the arrangement information set in the third area 43 on the main storage device 40 is read (step S22), and the arrangement information is entered from the user file 51 according to the arrangement information thus read. A plurality of records including the requested record is read into the output buffer 45 (step S23). Thereafter, the input / output processing means 30 reads the input requested record from the input / output buffer 45 into the user data area 44 (step S24).
(Step S2)
5).

In the record number output process of step S25, as shown in the flowchart of FIG. 6, the input / output processing means 30 transmits the record number output availability information from the first area 41 on the main storage device 40. Reading (step S41),
Only when it indicates that a record number is to be output (yes in step S42), the direct search input sentence 22
Alternatively, the record number of the record input / output by the execution of the direct search output statement 23 is stored in the record number output file 5.
2 (step S43).

Thereafter, when the program 20 requests the execution of the direct search output statement 23 to the user file 51, the input / output processing means 30, as shown in the flowchart of FIG. It is checked whether or not it is arranged in the buffer 45 (step S31).

If they are arranged (S31 is y
es), after overwriting the output-requested record existing in the user data area 44 in the input / output buffer 45 (step S34), performs the record number output process shown in FIG. 6 (step S35). On the other hand, if they are not allocated (S31 is no), the plurality of records allocated in the input / output buffer 45 are written back to the user file 51, and the input / output buffer 45 is made reusable (step S32). . Thereafter, the arrangement information set in the third area 43 of the main storage device 40 is read (step S33), and a record is written from the user data area 44 to the input / output buffer 45 in accordance with the read arrangement information (step S34). ), And performs a record number output process shown in FIG. 6 (step S35).

FIG. 7 is a diagram showing an example of the contents of the record number output file 52 when the execution of the program 20 has been completed when the record number output availability information indicates the output of the record number. As shown in the figure, the record number of the record requested for input / output and the input / output type information (READ, WRITE) indicating whether the record is requested for input or output are stored. Is done.

Next, the present embodiment will be described in more detail with reference to specific examples.

In general, in the program 20 for performing direct search input / output processing, there is no regularity in the order of record access, but in some programs, the order of record access tends to be in ascending order or the order in which records are accessed in descending order. There are things to have.

Assume that the contents of the record number output file 52 at the end of the first execution of the program 20 are as shown in FIG. It should be noted that input / output type information is omitted in FIG. In the case of the example of FIG. 8, it can be determined that the record access order tends to be in ascending order. As described above, when it is determined that the record access order of the program 20 has a high tendency to be in ascending order, the user sets, as the arrangement information, the record requested to be input / output but not arranged in the input / output buffer 45; Immediately after that, arrangement information indicating that a total of (n + 1) records including the n records existing consecutively is arranged in the input / output buffer 45 is created. Here, [record length × (n + 1)] is the size of the input / output buffer 45.

Further, the user obtains the optimum size of the input / output buffer 45 based on the contents of the record number output file 52 shown in FIG. 8, and prepares input / output buffer size information indicating the size. That is, attention is paid to the portion where the record numbers are continuous, and it is checked how many records have the continuous portion. Then, the number of records × record length of that portion is set as the size of the input / output buffer 45. By doing so, it is possible to arrange the data to be accessed in the input / output buffer 45 with a smaller number of times when reading the data. In the example of FIG. 8, since there are many portions where six records are continuous, input / output buffer size information indicating that the size of the input / output buffer 45 is (record length × 6) is created.

At the time of executing the second and subsequent programs,
The user uses the option analysis means 10 to record the record number output availability information instructing not to output the record number in the first area 41 and to set the size of the input / output buffer 45 in the second area 42 (record Length × 6), input / output buffer size information instructing the third area 43
Indicates that a total of six records, i.e., a record requested to be input / output but not allocated in the input / output buffer 45 and five consecutive records following it, are allocated in the input / output buffer 45. The arrangement information is set (FIG. 2, steps S1 to S3).

When such a setting is made, the input / output processing means 30 sends the input / output buffer 45 from the second area 42 to the input / output buffer 45 when the OPEN statement 21 in the program 20 is executed, as shown in FIG. Input / output buffer size information indicating that the size is (record length × 6) is read, and an input / output buffer 45 having a size of (record length × 6) is secured in the main storage device 40 (steps S11 and S12). .

When the direct search input statement 22 is executed, the record (input number 1) requested by the input is sent to the input / output buffer 45.
If it is not located in the middle (FIG. 4, step S21 is n
o), the arrangement information stored in the third area 43 is read, and as shown in FIG. 9, from the user file 51 to the input / output buffer 45, starting from the record of record number 1 (= m), Five consecutive records are read at once (steps S22 and S23). Next, when the input processing of the records of the record numbers 2, 3, 5, and 6 is performed, since the records already exist in the input / output buffer 45, the input / output buffer 45
The process of reading records into is not performed.

Thereafter, when input processing is performed on the record of record number 7, since it does not exist in the input / output buffer 45, the record of record number 7 is used as a starting point, and the five successive records Are arranged in the input / output buffer 45 (steps S22, S23).
Next, when input processing is performed on the record with the record number 15, since the record does not exist in the input / output buffer 45, five records successively starting from the record with the record number 15 are stored in the input / output buffer 45. 45 (steps S22 and S23). Thereafter, when the input processing of the records of the record numbers 16, 17, 18, 19, and 20 is performed, they are already input / output buffer 4
5, the record read processing from the user file 51 to the input / output buffer 45 is not performed.

Further, when the direct search output statement 23 is executed, if the record requested to be output by the direct search output statement 23 (for example, the record of record number 1) is not arranged in the input / output buffer 45 ( FIG. 5, Step S3
1 is no), the arrangement information stored in the third area 43 is read, and as shown in FIG.
4 to the input / output buffer 45, record number 1 (= m)
Starting from the record No. 5, five consecutive records following it are written at once (steps S33, S34).
Next, when performing output processing of the records of record numbers 2, 3, 5, and 6, since they already exist in the input / output buffer 45, the records of the records from the user data area 44 to the input / output buffer 45 are output. No reading process is performed.

Thereafter, when output processing is performed on the record of record number 7, since the record is not present in the input / output buffer 45, the record of record number 7 is used as a starting point and five successive records Is written into the input / output buffer 45 (steps S33 and S3).
4). Next, when an output process is performed on the record with the record number 15, since the record is not present in the input / output buffer 45, five records successively starting from the record with the record number 15 are stored in the input / output buffer 45. 4
5 (steps S33, S34). afterwards,
When outputting records of record numbers 16, 17, 18, 19, and 20, the records are read from the user data area 44 to the input / output buffer 45 because they already exist in the input / output buffer 45. No action is taken.

As described above, by setting, as the arrangement information, the arrangement information indicating that the record requested to be input / output and the n records immediately following it are arranged in the input / output buffer 45. If the tendency of the record access order of the program 20 is the ascending order, the probability that the record requested for input / output exists in the input / output buffer 45 increases, and accordingly, the user data area 44 and the user file 51 Since the number of times of data transfer to the I / O buffer 45 is reduced and the utilization efficiency of the I / O buffer 45 is improved, I / O processing is sped up.

For example, if the contents of the record number output file 52 are as shown in FIG. 11 at the end of the first execution of the program 20, the user can input the following arrangement information and input / output buffer. Create size information. In the case of the example shown in FIG.
It can be determined that the record access order by 0 tends to be descending. As described above, when it is determined that the record access order is likely to be in descending order, the user determines, as placement information, a record for which input / output has been requested but not placed in the input / output buffer 45, and a record immediately before that. Arrangement information for instructing to arrange a total of (n + 1) records including the n consecutive records in the input / output buffer 45 is created. Again, [record length x (n
+1)] is the size of the input / output buffer 45.

Further, the user obtains the optimum size of the input / output buffer 45 based on the contents of the record number output file 52 shown in FIG. 11, and prepares input / output buffer size information indicating the size. In this example, since there are many portions where six records with consecutive record numbers are accessed, the user inputs / outputs a buffer size indicating that the size of the input / output buffer 45 is (record length × 6). Create information.

At the time of executing the second and subsequent programs,
The user uses the option analysis means 10 to record the record number output availability information instructing not to output the record number in the first area 41 and to set the size of the input / output buffer 45 in the second area 42 (record Length × 6), input / output buffer size information instructing the third area 43
Record which was requested to be input / output but was not placed in the input / output buffer 45, and the record
I / O buffer 4 for a total of 6 records
5 is set (steps S1 to S3 in FIG. 2).

When such a setting is made, the input / output processing means 30 sends the input / output buffer 45 from the second area 42 to the input / output buffer 45 when the OPEN statement 21 in the program 20 is executed, as shown in FIG. Input / output buffer size information indicating that the size is (record length × 6) is read, and an input / output buffer 45 having a size of (record length × 6) is secured in the main storage device 40 (steps S11 and S12). .

In the case where the direct search input sentence 22 is executed, if the record (for example, the record of the record number 20) requested by the input is not arranged in the input / output buffer 45 ( FIG. 4, Step S
21 is no), the arrangement information stored in the third area 43 is read, and as shown in FIG.
1 to the input / output buffer 45, the record number 20 (=
m) and five consecutive records immediately before it are read at a time (steps S22 and S2).
3). Next, record numbers 19, 18, 17, 16, 1
In the case of performing the input processing of the records 5, the reading processing of the records from the user file 51 to the input / output buffer 45 is not performed because they already exist in the input / output buffer 45.

Thereafter, when performing input processing for the record of record number 6, since the record of record number 6 does not exist in the input / output buffer 45, the record number 6 and the five consecutive Are placed in the input / output buffer 45 (steps S22 and S22).
23). Next, when input processing of the records of record numbers 5, 4, 3, 2, 1 is performed, since these already exist in the input / output buffer 45, the user file 51
The processing for reading records from the I / O buffer 45 into the input / output buffer 45 is not performed.

Further, when the direct search output statement 23 is executed, the record requested to be output thereby (the record having the record number 20) is stored in the input / output buffer 4.
5 (FIG. 5, step S31 is n
o), the arrangement information stored in the third area 43 is read, and as shown in FIG. 13, the record of the record number 20 (= m) is stored in the user data area 44 to the input / output buffer 45 and immediately before that. Five consecutive records are arranged at a time (steps S33, S34). next,
When performing output processing of the records with the record numbers 19, 18, 17, 16, and 15, since the records already exist in the input / output buffer 45, the records are read from the user data area 44 to the input / output buffer 45. No action is taken.

As described above, as the arrangement information, the arrangement information instructing to arrange the record requested to be input / output and the n records existing immediately before it in the input / output buffer 45 is set. Therefore, when the tendency of the record access order of the program 20 is descending, the probability that the record requested for input / output exists in the input / output buffer 45 increases, and accordingly, the input / output from the user data area 44 and the user file 51 Since the number of times of data transfer to the buffer 45 is reduced and the use efficiency of the input / output buffer 45 is improved, the input / output processing is speeded up.

For example, when the contents of the record number output file 52 are as shown in FIG. 14 at the end of the first execution of the program 20, the user can input the following arrangement information and input / output buffer. Create size information. In the case of the example shown in FIG.
A value of 0 can be determined to mean that there is a high tendency to access records located before and after a record having a certain record number. Then, when there is such a tendency in the record access order, the user sets the arrangement information as
A record for which an I / O request has been made but not arranged in the I / O buffer 45, i consecutive records immediately before that, and j consecutive records immediately after that, are stored in the I / O buffer. The arrangement information for instructing the arrangement in the area 45 is created. Here, (i + j + 1) ×
The record length is the size of the input / output buffer 45.

Further, the user obtains the optimum size of the input / output buffer 45 based on the contents of the record number output file 52 shown in FIG. 14, and prepares input / output buffer size information indicating the size. In this example, input / output buffer size information indicating that the size of the input / output buffer 45 is (record length × 11) is created.

At the time of executing the second and subsequent programs,
The user uses the option analysis unit 10 to record record number output availability information instructing not to output a record number in the first area 41, and to set the size of the input / output buffer 45 in the second area 42, for example. (Record length × 11), the input / output buffer size information indicating the third
, A record that was requested to be input / output to the area 42 but was not placed in the input / output buffer 45, five consecutive records immediately before that, and five consecutive records immediately after that The arrangement information instructing to arrange the total of 11 records in the input / output buffer 45 is set (FIG. 2, steps S1 to S3).

When such a setting is made, the input / output processing means 30 transfers the input / output buffer 45 from the second area 42 to the input / output buffer 45 when the OPEN statement 21 in the program 20 is executed, as shown in FIG. Reads input / output buffer size information indicating that the size is (record length × 11),
An input / output buffer 45 having a size of (record length × 11) is secured in the main storage device 40 (steps S11 and S1).
2).

When the direct search input statement 22 is executed, the record (input record 20) requested by the input is input / output buffer 4
5 (FIG. 4, step S21 is n
o), the arrangement information stored in the third area 43 is read, and the records of the record numbers 15 to 25 are arranged at a time from the user file 51 to the input / output buffer 45 as shown in FIG. 15 (step S22). , S23). Next, when input processing of records with record numbers 18, 19, 17, 15, and 16 is performed, since they already exist in the input / output buffer 45, the user file 51 is input.
The processing for reading records from the I / O buffer 45 into the input / output buffer 45 is not performed.

When the direct search output statement 23 is executed, the record requested to be output (the record having the record number 20) is stored in the input / output buffer 4.
5 (FIG. 5, step S31 is n
o), the arrangement information stored in the third area 43 is read, and as shown in FIG. 16, the record of the record number 20 (= m) and Five consecutive records and five consecutive records immediately after that are arranged at a time (steps S33 and S34). 18,1
When the input processing of the records 9, 17, 15, and 16 is performed, since the records already exist in the input / output buffer 45, the processing of reading the records from the user file 51 to the input / output buffer 45 is not performed. .

As described above, the arrangement information indicating that the record requested for input / output, the i records existing immediately before the record, and the j records existing immediately after the record are arranged in the input / output buffer 45. In the case where there is a tendency to access a record before and after a certain record in the order of record access of the program 20, the input / output processing can be speeded up.

In the above-described embodiment, one piece of arrangement information is set in the third area 43. However, the input / output buffer data arrangement analysis means 13 supplies the arrangement information for input processing (input arrangement information). Information) and a setting information for output processing (output setting information) in the third area 43. Further, the input / output processing means 30 is provided with a direct search input If the input-requested record does not exist in the input / output buffer 45, the record is placed in the input / output buffer 45 in accordance with the input placement information. If it does not exist in the buffer 45, a function of arranging records in the input / output buffer 45 according to the output arrangement information may be provided. By doing so, it becomes possible to speed up the input / output processing even if the program has a different record access order between the input processing and the output processing.

[0072]

As described above, the present invention outputs the record number of the record requested for input / output to the record number output file when the program for performing the direct search input / output processing is executed, and outputs the record number for the input / output request. If the record does not exist in the I / O buffer, there is input / output processing means for allocating the record to the I / O buffer according to the arrangement information set by the user using the I / O buffer data arrangement analysis means. Even when an area on the main storage device cannot be secured, the input / output buffer can be efficiently used to speed up the input / output processing. In other words, based on the record numbers stored in the record number output file, the user knows the tendency of the program in the order of record access,
Since it is possible to set the arrangement information according to the tendency, the input / output processing can be performed at high speed using the input / output buffer.

The present invention further comprises a record number output request analysis means for setting record number output permission / inhibition information indicating whether or not to output a record number according to a user's instruction. Since the output process of the record number can be prevented from being performed for the program output to the file, useless record output process is not performed.

Further, since the present invention includes an input / output buffer size analyzing means for setting an optimum input / output buffer size in accordance with a user's instruction, the input / output processing can be further speeded up.

Further, according to the present invention, at the time of input processing and at the time of output processing, the input arrangement information corresponding to the respective record access order,
Since the input / output buffer data arrangement analysis means for setting the output arrangement information is provided, the input / output processing can be performed at high speed even when the input request and the output request have different record access order tendencies.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing example of an option analyzing means 10;

FIG. 3 is a flowchart showing a processing example of an input / output processing unit 30 when executing an OPEN statement.

FIG. 4 is a flowchart showing a processing example of the input / output processing means 30 when executing a direct search input sentence.

FIG. 5 is a flowchart showing a processing example of the input / output processing means 30 when executing a direct search output sentence.

FIG. 6 shows an input / output processing unit 30 during a record number output process.
6 is a flowchart showing an example of the processing of FIG.

7 is a diagram showing an example of the contents of a record number output file 52. FIG.

FIG. 8 is a diagram showing an example of the contents of a record number output file 52 when the program 20 having a tendency to access records in ascending order is executed.

FIG. 9 is a diagram for explaining an operation of the input / output processing unit 30 when a record is placed from the user file 51 to the input / output buffer 45.

FIG. 10 shows a user data area 44 to an input / output buffer 4
FIG. 10 is a diagram for explaining the operation of the input / output processing means 30 when a record is placed in No. 5;

FIG. 11 is a diagram showing an example of the contents of a record number output file 52 when the program 20 having a tendency for the record access order of records to be in ascending order is executed.

FIG. 12 shows a user file 51 to an input / output buffer 45.
FIG. 8 is a diagram for explaining the operation of the input / output processing unit 30 when a record is placed in a record.

FIG. 13 shows a user data area 44 to an input / output buffer 4
FIG. 10 is a diagram for explaining the operation of the input / output processing means 30 when a record is placed in No. 5;

FIG. 14 is a diagram showing an example of the contents of a record number output file 52 when a program 20 having a high tendency to access records immediately before and immediately after a record having a certain record number is executed.

FIG. 15 shows an input / output buffer 45 from a user file 51;
FIG. 8 is a diagram for explaining the operation of the input / output processing unit 30 when a record is placed in a record.

FIG. 16 shows a user data area 44 to an input / output buffer 4
FIG. 10 is a diagram for explaining the operation of the input / output processing means 30 when a record is placed in No. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Option analysis means 11 ... Record number output request analysis means 12 ... I / O buffer size analysis means 13 ... I / O buffer data arrangement analysis means 20 ... Program 21 ... OPEN statement 22 ... Direct search input statement 23 ... Direct search output statement 30 ... I / O processing means 40 ... Main storage device 41 ... First area 42 ... Second area 43 ... Third area 44 ... User data area 45 ... I / O buffer 50 ... External storage device 51 ... User file 52 ... Record Number output file

Claims (4)

[Claims] 1. A file input / output device for performing input / output processing on a user file via an input / output buffer, wherein input / output is performed by a record number output file and a program for performing direct search input / output processing on the user file. When the requested record is not arranged in the input / output buffer, the user instructs the arrangement information indicating what record is arranged in the input / output buffer including the record requested for input / output. An input / output buffer data arrangement analyzing means for setting, according to the program, a record number of a record input / output requested by the program is output to the record number output file, and a record input / output requested by the program is stored in the input / output buffer. If not, the I / O buffer data File input / output processing means for arranging a plurality of records including the input / output requested record in the input / output buffer in accordance with the arrangement information set by the position analysis means. 2. A record number output request analysis means for setting record number output availability information indicating whether or not to output a record number to the record number output file in accordance with a user's instruction, and The means for outputting the record number of the record requested to be input / output by the program only when the record number output availability information set by the record number output request analysis means indicates that the record is to be output; 2. The file input / output device according to claim 1, further comprising a configuration for outputting to a file. 3. An input / output buffer size analysis means for setting input / output buffer size information indicating a size of an input / output buffer in accordance with a user's instruction, and wherein said input / output processing means is provided with said input / output buffer size analysis means. 3. The file input / output device according to claim 2, further comprising a configuration for securing an input / output buffer of a size indicated by the input / output buffer size information set in the main storage device. 4. A file input / output device for performing input / output processing on a user file via an input / output buffer, wherein an input request is issued by a record number output file and a program for performing direct search / input processing on the user file. In the case where the set record is not arranged in the input / output buffer, input arrangement information indicating what record to be arranged in the input / output buffer including the input-requested record in accordance with a user instruction In addition to the setting, when the record requested to be output by the program is not arranged in the input / output buffer, it indicates what record including the record requested to be output is arranged in the input / output buffer. An input / output buffer data layout analyzer that sets output layout information according to user instructions. And outputting, to the record number output file, a record number of a record requested to be input / output by the program, and input / output type information indicating whether the record is an input requested or an output requested. If the record requested by the program is not allocated in the input / output buffer, the record requested to be input to the input / output buffer according to the input allocation information set by the input / output buffer data allocation analyzing means. And if the record requested to be output by the program has not been placed in the input / output buffer, the input / output buffer according to the output placement information set by the input / output buffer data placement analysis means. A buffer containing the requested record File input and output apparatus comprising the input and output processing means for arranging the code.