JPS58197559A - Data transferring method - Google Patents

Abstract

PURPOSE:To reduce a load on a central processing unit during the execution of a program and to improve an execution speed by only specifying transfer specifying information during the development of a user program and accessing a data transfer subroutine, and thus generating the program. CONSTITUTION:A discrimination on whether an initial access address is in the same physical record with a final access address or not is made by processing 30, and an advance to processing 37 when so or to processing 31 when not is made. Further, a discrimination on whether the initial access address and final access address are both boundary addresses of the physical record or not is made by the processing 37 and an advance to processing 36 when so or to processing 38 when not is made. Furthermore, a discrimination on whether there is a physical record to be transferred left between the physical record including the initial address and the physical record including the final access address or not is made by processing 35, and an advance to the end when so or to the processing 36 when not is made.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transfer method between a main storage device and an auxiliary storage device of a single T collection needle system that performs real-time processing.

When the central processing unit transfers data from the auxiliary storage device to the main storage device, or vice versa, the time required is several thousand to tens of thousands of steps in the central processing unit. This corresponds to the instruction execution time, and if the transfer becomes long, the effect cannot be ignored, so it is desired that the execution time be shortened and programs can be created easily.

Conventionally, K accessing data on an auxiliary storage device is...
- Due to hardware constraints and convenience of binary representation 64.
128.256 @ or byte is used as a unit (this unit is referred to as a physical record hereinafter). Also, when data is transferred, the physical record boundaries are defined for each physical record length from the first address and address unique to the auxiliary storage device. It is known that data of an integral multiple of the physical record length is transferred from the start boundary address of the physical record. That is,
A physical record defines both the start boundary address and length.

Reading and writing can be considered for data transfer,
If we focus only on transfer, the two differ only in four transfer methods, so we will only discuss K in the following.

Conventionally, for K, which specifies and transfers the address of data handled by individual user programs, either ``indirect N-word transfer'' or ``direct record transfer'' has been selectively adopted for each data file. , each has advantages and disadvantages as explained below.

(1) Indirect N-word transfer Among the various data handled by the user program, if similar groups of data are grouped together as a file, the amount of data belonging to each file will increase, so it is already possible to , select an amount of data that is convenient for handling internal data according to the file, set it as a unit of logical record, and configure the file in this unit.

4411472 (at is 14 contact N11 according to the conventional method
li transfer explanatory diagram C 5. J) file name or file [1 auxiliary ta2 ltMi 瀘内°C reno 7r file storage start address, first item I4! 〆Enter @, lWk in code 4, set the number of words, = mwb - a - + number of pa, etc. as an easy conversion key. - Logical record area 7A, ”/H, 7G + 7
D... Place the file consisting of 7P and 7Q on the noodles th1
/log storage area in c carp below Yuji 11Ili
Area and Kanofu) Transfer to 5 e error, auxiliary storage device σ
File name or file number and required destination.
Indirect NI! by specifying information such as the number of the ring record 7A, the transfer logic reflex, the number of dots, and the user area 5 (hereinafter referred to as transfer specification information)! The transfer routine calls the physical record 2 containing the destination 1117 access address IS determined by the number of the first logical reflex door A by referring to the conversion table.
Person number, transfer physical record 2A, 2B, 2C...
Extract the total number of records 2M and 2N, and first transfer the data in the two physical records including the IIA access address IS to the work area 3t on the main storage (1') tTA
) Come on. This work storage 3 is currently being executed in the builder's storage device.
It may be within the g-gram or within the main memory.

Fig. 1 fbl iX p1 Fig. falK is an enlarged view of physical code 2A, in which the same numbers as those in falK represent the same thing, and in work area 3, the first physical record and the first logical record for two people. The part 4 required by the user program from the first access address 18 to the last address of the physical record F2A is transferred to the user area 5 by accessing (WIJT) the area in units of words. In this case, the part before the start access address IS in the physical reflex-FZA is out of scope and cannot be used! become a part.

Figure 1 (If the desired data area does not fit within one record as shown in ml, the next physical record code znj of physical record 2A [physical record 2Nf including FIM access address IE) llf up to the previous physical record 2M Transfer to work area 3 in units of recorded records (PI(,
TB...P)1. TM>, repeat the transfer (WjJT) to the user area 5 in word units, and then transfer the final (5
) As for physical record 2NK, first transfer the data of physical record 2N to work area 3 on the main storage device (PRTN)L, then physical
Code 2N1 (transfers the area corresponding to the -C part 10 (same figure (enlarged view shown in cl)) from the work area 3 to the user area 5 in word units (WUT) is completed. .

As shown in the same figure (at), the file has logical record 7A,
Consisting of 7R, 7C, 7D...7P, 7Q, the user program simply specifies the transfer destination information, converts the logical record information to physical record information by referring to the conversion table prepared in advance, and saves the work area. 3 and movement to the user area 5 in word units are processed in a single closed subroutine, so the burden during program development can be reduced. However, since word transfer (W U 1'') is required not only for the first and last physical records 2A, 2N but also for the intermediate physical records 2B, 2C, . . . 2M, there is a drawback that the execution speed is slow.

(6) (21 Direct record transfer Figure 2 (at, fbl, (cl, fdl) is an explanatory diagram of direct record transfer using the conventional method.
Depending on the data referenced by the user program, specify the file name or file number and file storage location in advance! 4 address, future code number, number of words per record, number of logical records, etc. are prepared as a conversion table, and when the main program of the user program accesses the file data. In addition, the file name or file number, the required tip MI filling code number, and the required number of logical records.

Indirect N-word transfer and rFIJ specify transfer specification information such as the position of the user range, but the main difference is that the logical record structure of the file is converted into physical record information within the sag routine. It is unnecessary to complete a physical record that includes the first address of the logical record number to be used, the first w4 access address, and the final address of the required l1kI/4 logical record number, which is the main route 7 access address. There is a range and C, this #el! The entire area of the filled-in record is regarded as a necessary part, and the data is directly transferred from the file area 6 to the user range without providing a single print area.

For example, in Figure 2 [al is the desired tool file is logical record 8]
It is composed of A, bB, and 8C, and due to their position, all of the gators in Ethics Receipt 2B and 2C are considered to be Yuka.
However, physical record 2AP3 has some unnecessary parts (-II!
There are some unnecessary parts (the same figure (- embroidered part)) in 12C, 1LfJ figure (physical record 2B in cl).
Physical record 2A, physical record 2A,
20MK has some missing fli#轡(IIy1 diagram (shaded area in cl), but physical record 2A, 2
Completely move B and 2C to U area 5 (same figure (dl # [)
Transfer (P)jT) to.

In direct record transfer 5, this is true as indirect N# transfer, and the physical record rate is directly transferred to the user area 5, so there is no transfer burden on the central processing unit, but file I! At #Tt, an appropriate allocation t4 is made, but after the transfer is completed, the main program of the user program has to do 11 of the necessary and unnecessary parts, which increases the number of steps and creates a heavy burden during program development. The invention was made to eliminate the above-mentioned drawbacks, and its purpose is to provide a closed-type data transfer sag routine that combines the functions of indirect Nli transfer and direct record transfer, and incorporates the advantages of both, and to provide a user program. 5. Of the various data handled by the company, data belonging to similar groups are compiled into a file, a logical record length suitable for handling the files and takes is determined in advance, and a conversion data consisting of table setting information is created. Once created, a program can be created by simply specifying the transfer specification information and calling the take transfer subroutine when developing the user program. When executing the program, the load on the central processing unit is reduced and the execution speed is increased. To provide ways to improve.

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

When designing a data file to be used in a user program, it is necessary to create a conversion table for the file by combining multiple data groups into a logical record structure consisting of the same number of data (9) and creating a conversion table for the file. The 0-view 3 diagrams, which are the same as the conventional method, are the 5i! of the present invention!
By example'/) Variant; Mel diagram, conversion nople (CVT) for files consisting of multiple fi7 files.
9 contains the internal code, which is expressed by a specific code, the file number, the file number, the first physical record No. 4 of the file, and the first storage address area, and the first physical record number of the file.
J-word per card area'.

Includes the total number of stamp records (n) area. This is power・−′
There is also work line area information C for reference to this work area, but it is omitted because it is often stored in the common σ system table for the entire computer system.

Section 4 is a flowchart of a data transfer routine according to an embodiment of the present invention, and FIG. 5 is an explanatory diagram of data transfer according to an embodiment of the present invention. In Figure 8145, the same parts as in Figure 1 (the same numbers as each part) are shown, and below, with reference to Figures 3, 4, and 5, the operation of the take transfer subroutine of the present invention will be explained. Explain.

(10) First, in process 30, the start access address and #end 7 habit 7
It is determined whether the address and address are in the same physical record, and if they are in the same physical record, the process goes to step 37, and if they are not in the same physical record, the process goes to step 31. In the configuration shown in Figure 5, the first access address is area Is, ! Ending process 7
- The dress is an area IE.

Since they are not in the same physical record, proceed to step 1131.Next, in step 37, the first access address and the last access address are both physical record boundary addresses (that is, the first access address and the last access address are in the same physical record). , it is determined whether the address is 7 (the next i, *i is the boundary address), and if YES, the process 36 (
(Described later) K, No If so, proceed to body 38.

Process 38 is an indirect N word transfer subroutine that indirectly transfers data between the first access address and the last access address.

In process 31, it is determined whether the first access address is the first boundary 7 address of the physical record. If YIif8, the process proceeds to process 33 (described later); if NO, the process proceeds to process 32.

In the collection of FIG. 5, it is not a first application boundary address, so process 32
Proceed to. Process 32 is an indirect NWM transfer subroutine, which indirectly transfers the physical record from the first access address to the l&destination address for each physical record that includes the first access address, and proceeds to process 33〇#! In the configuration shown in FIG. 5, physical reflex 1.2A starting from area IS is indirectly transferred Nm to user area 5 (combination of PR, T and XytJT).

In the burying step 33, it is determined whether or not the F address is the final boundary address of the physical record in the 7th rut.

In the configuration shown in FIG. 5, since it is not the I6E era boundary γ address, the process goes to process 34. Process No. 34 is an indirect N candy transfer subroutine, and the physical record including the last access atrea,
・Indirect N candy transfer L-'C processing 35 Kf from the earlier application boundary address to 4% 43 access address
In the configuration shown in Figure 5, physical record 2 ends in area IE.
Indirect N@ transfer (PRT and WIJT combination) to the user image area 5.

In quick burial 35, 1 immediate code including the first access address)
'I wonder if there are any physical records left to be transferred between the last accessed address and the original record.
Determine, if No, end, if Ylii8, process 36
Proceed to. In the configuration shown in Figure 5, physical records 2B to 2M remain, so the process advances to step 1136. Process 1136 is a direct record transfer subroutine that transfers a complete physical record according to the procedure of the direct record transfer subroutine previously described. $1!5 In the configuration shown in the diagram, physical records 2B to 2
Transfer M to user area SKi [Tawara record transfer (PTtT). Upon completion of step 1136, the data transfer subroutine ends and returns to the main program.

3. iThis data transfer subroutine is conveniently closed type. This is shown in Figure 5.
t data transfer TR, N8F is completed.

Data is assigned to a general position and the file data is transferred using only the conventional indirect N-word transfer for the 7S: file. ) Tl = Tit + Ta2 + 'ras here KTal:
Indirect N-word transfer time of data in the physical record that includes the first access address of the file TaJ Between data in the intermediate physical record of near fill *N-word transfer time T@@: Indirect N of the data in the physical record that includes the final access address of the file It is the word transfer time, and the transfer time T when using the method of the present invention.
For b, refer to Figure S: Tb-Tbt +T1)g+Tbm Here, Tb1 * Indirect Ni1 transfer time of data in the physical record including the first access address of 7 aisles Tb1: Direct record transfer of data in intermediate physical records of 7 aisles Time Tb1 near 7 (interval (14) for indirect N-word transfer of data in the physical record including the final access address).

Comparing time T8 and Tb, each m1llT1
and 'rbt I third term Ta, and 'f'bs are the same from what has been explained so far, so s JR2 filling 'r,
1 and Tbl only need to be compared.

The average time required to start accessing a predetermined physical record in the auxiliary storage device is T1 (hours).

The number of words in word 1 physical record white (v = + -y
) *If the data transfer rate between the auxiliary storage device and the main storage device is 2M, and the number of additional records is n, then 1 indirect N word transfer and fkK requires access time for each new physical record. Therefore, T112=aXTt+nXW/V +nxW/U where KnXTt is the total access time, nxW/V is the total data transfer time to the work area, nXW/U is the total data transfer time within the main memory, and T b2 = T I + n x W/V where Tl is the initial access time and n x W/V is the total data transfer time to the user terminal.

Yo Cl + result of calculation Ta-Tb=nX (Tt+W/U)-Tt.

(m11), U-! -(rLXi) Ilt, 2#ST, -Tb-n x 50.2!16-5o
(ms) According to "(nml, 2.3...K 0.
256 (ms), 50.512 (ms), 15α7
68 (ms)-, and the larger n becomes, the more significant the difference becomes.

Note that the above comparison was made for the general data case, so if both the first and last access addresses are in the same physical record, or if one or both are physical record boundary addresses, the number of intermediate physical records n
In special cases such as when is 00, the formula for calculating the difference will be different, but will be omitted.

According to the present invention, for each file name or file number, table setting information such as the first physical record number of the file, the first storage address, the number of words per record, and the total number of records, and f) conversion consisting of b) Since it is equipped with a table and a Kuzyz-type data transfer subroutine that has both indirect N-word transfer and direct record transfer functions,
When transferring data between the main storage and auxiliary storage, the file name or file number, required first logical record number, required number of logical records, user area location, etc. f) You can create a program by simply retrieving the data transfer subroutine by specifying the transfer specification information, and when executing it, refer to the conversion tape in the 4-column subroutine to determine the start and final access address of the required data group. In addition to extracting each code and code, complete physical record area data is transferred directly to the record, and incomplete physical record area data is indirectly transferred to the unit logic. Even if the amount of data per record is increased or decreased, it is only necessary to replace the changed parts of the conversion chain, increasing work efficiency during program development, reducing the burden on the central Mll storage device during program execution, and ( 17) Achieves execution coordination, which is essential for industrial metering machines.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of indirect N-word transfer using the conventional method, and Figure 2 (
al, (bl, (cl, (di) is an explanatory diagram of direct record transfer using the conventional method, FIG. 3 is a conversion table diagram, and FIG. 4 is a data transfer subroutine according to the fourth embodiment of the present invention.
Chin's 7T:1-chart, FIG. 5 is an explanatory diagram of data transfer according to an embodiment of the present invention. Sign description 18.11: Previous-9 final access address. 2A, 2B, 2C...2M, 2N: Physical record,
3: Work area, 4, 10: Start, necessary part in I# end physical read. Fl, 5A, SB, FIC nibogram inner region. 7A, 7B, 7C, 7D...7P, 7Q, 8A, AB
, 8C: Logical Refud, 30.31-38; Processing,
9: Conversion table CVT, PRT, PRTA
~PRTN: Physical VCo-)'Transfer. WIJT: Word transfer (18) (1:r)
(C) TI Figure f3TfU BuX-

Claims (1)

[Claims] For each data file in the auxiliary storage of the computer system, at least the file name or file number, the first access address, the physical record number containing the address, and 1
Quality tape consisting of the number of words per logical record and the total number of logical records! and specify a desired data area and self-program storage area in units of logical records in the user program being executed in the main memory, and specify the data area in the divine assistant memory and the main memory. When the preprocessing program for data transfer between the self-program storage areas in the auxiliary storage device is activated, the conversion table is referred to, and the first access address and the final access address to be transferred in the auxiliary storage device are extracted, and both access addresses are Among the data between addresses, data stored in a part of the physical record area is indirectly Nl! A data transfer method characterized in that data stored in the entire physical record area is transferred using a +2#L contact record transfer method.