JP2539419B2 - Auxiliary storage device selection method - Google Patents

Description

The present invention relates to a computer system having virtual memory,
In particular, when the mechanism that supports the virtual memory is realized by the auxiliary storage device group, the virtual storage area of the specific job is realized in the specific auxiliary storage device, and the paging performance of the virtual memory is improved. Regarding the control method to be realized.

[Conventional technology]

In recent years, as the field of application of electronic computers has expanded, an address control method, that is, a virtual memory method, in which the restriction on the capacity of the real storage area (real memory) is released, is becoming common.
The concept of virtual memory is based on IBM's MANUAL OS / V2S2MVJS OVERVIEW, document number GC28-0984 (IBM OS / VS2 MVS Overvie
w; GC28-0984). As shown in FIG. 2, in the virtual memory control method, the virtual memory 130 is divided into page units (one page is 4096 bytes), and each page is stored in a page 110 in the real memory 100 as needed. (The page of real memory is also called a page frame).

Therefore, each page frame in the real memory 100 has a plurality of address space pages 135. Here, the address space means the virtual memory 130, and the address space exists for each job.

In order to use the page frame 110 in the real memory 100 for a page in another address space, the contents of the page frame 110 are temporarily pushed out to the auxiliary memory 120, and the page in the relevant address space is paged in the real memory 100.・ Bring it to the frame. The process of pushing out to the auxiliary memory 120 is known as the page-out process, and the process of bringing the page from the auxiliary memory 120 is known as the page-in process.

As is clear from the above, the auxiliary storage 120 shown in FIG. 2 is indispensable in order to realize the virtual storage control. Further, all the pages of each address space will exist in the auxiliary storage 120. Therefore, each page in real memory 100
A page-out process and a page-in process (collectively referred to as paging process) for a frame are performed between the real memory 100 and the auxiliary memory 120.

[Problems to be solved by the invention]

As an auxiliary storage device that realizes the virtual storage system, a magnetic disk device or a magnetic drum device that is capable of direct access or random access is generally well known. Further, in order to speed up the paging process, a means for preparing a plurality of these auxiliary storage devices and distributing the paging file group among the plurality of devices has been taken.

By the way, with the remarkable development of the use of electronic computer systems in recent years, in addition to batch processing, TSS (Time Sharin
There is a high demand for online processing such as g System). Also,
In conventional batch processing, throughput is important, whereas in TSS processing, immediate response time is required.

However, in the address space, batch processing, TSS
There is no distinction in processing, and no distinction is made in allocating the auxiliary storage device group. Therefore, even if the semiconductor memory device (the access time of the semiconductor memory device is 100 times faster than that of the magnetic disk device) as a result of the recent technological development is used in the auxiliary memory device group, the effect is not obtained. Not noticeably.
The overall performance of the electronic computer system is only slightly improved, and the effect of installing expensive equipment does not occur. It is desirable to allocate an auxiliary storage device that achieves high-speed access to the job address space that requires immediate response time such as TSS processing.

An object of the present invention is to provide a method for managing an auxiliary storage device group of an electronic computer system having virtual storage, in which a high-speed auxiliary storage device and a general-purpose auxiliary storage device group are mixed, a high-speed auxiliary storage device is provided for a specific address space. It is to provide a control means using a storage device, and in particular, to provide a means for speeding up response performance such as online processing represented by TSS processing.

Another object of the present invention is to preferentially use a high-speed auxiliary storage device for an address space that requires particularly high response characteristics among address spaces that require high-speed response performance such as TSS. It is to provide a control means.

[Means for solving problems]

The above-mentioned purpose is that when the control block group for address space management is created prior to the execution of each job, the main memory / virtual memory management program causes the address space control block (ASC
B: Address Space Control Block) A means of setting characteristic information of each job in a specific field, and a high-speed auxiliary memory such as a semiconductor memory device is allocated to the job that executes paging processing at high speed. It is achieved by realizing.

[Action]

The virtual memory control method of the present invention is realized by a main memory / virtual memory management program that is started at the start of execution of each job and when paging processing is required. The main memory / virtual memory management program first executes the address space control block (ASCB: A) prior to the execution of each job.
Set the characteristic information of each job in a specific field in the ddress Space Control Block).

Next, the paging device table (Paging Dev
Paging device index (PDVI) number is obtained from the header of the ice table (PDVT) and the number is set to the extended page table (Extended Pag).
e Table: XPT). When the PDVI is obtained from the header of the paging device table PDVT and the job requires immediate response like TSS job, the number of the high speed auxiliary storage device will be assigned. There is no malfunction in relation to the operation of.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. 1 and FIGS. 3 to 6.

FIG. 1 shows a main memory / virtual memory management program for realizing the virtual memory control method of the present invention and address space control blocks in relation to real memory, virtual memory, and auxiliary memory. In FIG. 1, reference numeral 100 is a real memory, reference numeral 130 is a virtual memory, and reference numerals 120 and 140 are auxiliary memories. Here, the auxiliary storage is configured by a general-purpose auxiliary storage 120 realized by a magnetic disk device or the like and a high-speed auxiliary storage 140 realized by a semiconductor storage device or the like. The virtual memory 130 has an address space for each job. Therefore, a virtual memory 130 is created for each address space. It should be noted that a certain amount of area from the lower address in the virtual memory 130 is common to each address space.
Called 0. This new cloth 150 is also secured in the real memory 100 and becomes a new cloth 151. Therefore,
The new cloth 150 in the virtual memory 130 and the new cloth 151 in the real memory 100 are equal. Also, since the new cloth 150 is not subject to paging processing, the auxiliary storage 120,140
There is no Newclear 150 part of virtual memory 130 inside.

The area in the virtual memory 130 is divided into units 135 of a certain size. This divided unit is called a page. Virtual memory
A copy of each page of 130 is made in the auxiliary memory 120 or the auxiliary memory 140, and the paging process is performed later with each page slot 110 in the real memory 100.

The virtual memory control system 90 of the present invention exists in the new memory 151 in the real memory 100, and these are realized by the processing procedure of the main memory / virtual memory management program 91 and the specific field ASCBST95 in the address space control block ASCB92. To be done.

Reference numeral 93 is an Extended Page Tabl
e: XPT) and reference numeral 94 is a paging device table (PDVT). This control table 93,94 is a page slot 125 of auxiliary memory 120,140,
Used for 145 quota management.

The main memory / virtual memory management program 91 that realizes the virtual memory control method of the present invention uses the ASCB prior to the execution of each job.
The characteristic information of each job is set in 92 specific fields ASCBST95. The characteristic information includes distinction between the batch job, the TSS job, the online job, and the job execution priority (Job Priority). The characteristic information of the job is inherited from a generally known job management control program (not shown), and the computer system user can use the job control statement for batch processing and the TSS processing for computer processing. Specify with the logon command.

Next, the specific field ASCBST95 of ASCB92 is examined, and if the job characteristics are those requiring immediate response such as TSS processing and online processing, the paging device in each entry of the extended page table XPT93 is examined. Set the index number of the high speed auxiliary storage device 140 in the index (Paging Device Index: PDVI) field 96.
This index number is obtained from PDVT94.

Later, when a paging process is required between the memory 100 and the auxiliary storage 120, 140, the index number of the high-speed auxiliary storage 140 is added to the PDVI96 of XPT93 for the job that requires immediate response. Since it is set, this paging process is executed faster than when the general-purpose auxiliary storage 120 is used.

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

Figure 3 shows the control blocks for management, control tables (ASCB, SGT, PGT) and the control blocks for paging processing (PDVT, ASMVT, X) to realize virtual memory.
PGT) and is used by the main memory / virtual memory management program. In Fig. 3, each control block is represented by a Prefixed Save Area (PS).
A) It is pointed from 81. Specifically, for virtual memory management, ASCB92 is pointed to by PSA81, and segment tables SGT87, PGT88 are pointed by ASCB92 via real memory management control block RSMCB86. The extended page table XPGT93 exists after PGT88.

Complement storage device group from the PSA81
Communication Vector Table (CVT)
Auxiliary storage management vector table ASMVT83, via 82
It is managed by the paging device table PDVT94 and the device area allocation management map BMAP85.

The characteristic information of each job is specified field AS in ASCB92.
Stored in CBST95. ASCBST95 is a job status word file, and the main memory / virtual memory management program 91 sets and refers to values. Figure 4 shows the Job state word field AS.
This shows the contents of CBST95. Jyobo state word field AS
The CBST95 has the respective fields of the job characteristics JSTAT79 and the job priority JPRTY80. The value of the job characteristic field JSTAT79 is "0" for the batch job, "1" for the TSS job, and "2" for the online job. The Job Priority Field JP
A value from the lowest priority (= 0) to the highest priority (= 15) is set in RTY80.

The allocation management of the auxiliary storage device is performed by the paging device table PDVT94, the device area allocation management map BMAP85, and the extended page table XPGT shown in FIG.
Although it is done by 93, the control information of the high-speed auxiliary storage device or the general-purpose auxiliary storage device group is stored in the header part of the paging device table PDVT94. FIG. 5 shows the header part of the paging device table PDVT94 in detail.

In the header of PDVT94 in FIG. 5, (1) maximum number of entries, (2) entry number in PDVT94 allocated for high-speed auxiliary storage, (3) entry number in PDVT94 allocated for general-purpose auxiliary storage (4) Entry allocation information in PDVT94 is included.

Here, as shown in FIG. 3, each entry PDVTE84 of the paging device table PDVT94 indicates the type of device corresponding to the entry and the area allocation management map BMAP.
The pointers to 85 are stored. BMAP85 is a slot allocation table for each page, and exists for each entry of PDVT94.

Extended page table XPGT93 is used for slot allocation of auxiliary storage, and page table PGT8
There is one entry for each 8 entries. Each entry of the extended page table XPGT93 stores a paging device index number PDVI96 and a relative address value (Relative Byte Address: RBA) 97 of the page. Here, PDVI96 is the entry number of the paging device table PDVT94. RBA97 is the virtual address value of the page, and during paging processing,
Converted to a page slot number in auxiliary storage that corresponds to PDVI96.

Next, the operation of the main memory / virtual memory management program according to the present invention will be described. FIG. 6 is a flow chart showing the operation of the main memory / virtual memory management program shown in FIG. In FIG. 6, the determination process 11 branches the job into a batch process, a TSS process, and an online process. As described above, the job distinction is determined by the job control statement or the parameter specification information of the TSS logon command.

In processing 12,13,14, set the value in ASCBST95 in ASCB92,
As a result of processing 15, the priority value of Job is also JPRTY of ASCBST95.
Set to field 80.

Next, in the judgment processing 16, the header part (FIG. 5) of the paging device table PDVT94 is checked to judge whether or not the high speed auxiliary storage device is registered as the paging device. This means that if the values of the fields 71 and 72 in FIG. 5 are zero, the high speed auxiliary storage device is not registered. Even if the values of fields 71 and 72 are not zero, the allocation management bit
If 73 is full, it is currently unavailable. In the judgment processing 17, the characteristics of the job are examined, and if it is the batch processing, the processing 18 is executed.

Process 19 is a case where immediate response is required as in TSS job or online job, and process 18 is a case where immediate response is required as in batch job. Processing 1
8. The index number of processing 19 is the entry number of PDVT94, which is determined by obtaining information from the header section of PDVT94 shown in FIG.

In process 20, the extended page table XP shown in FIG. 3 is used.
Paging device index for each GT93 entry
The index number obtained in process 18 or process 19 is set in PDVI96. As described above, the high-speed auxiliary storage device can be preferentially assigned to the address space of the job that requires immediate response such as the TSS job or the online job.

In process 19, if you want to guarantee even more immediate response among TSS jobs and online jobs,
It suffices to check the value of the job priority JPRTY80 shown in FIG. 4 and execute the process of preferentially allocating the high-speed auxiliary storage device to the job having the highest priority. This process is the sixth
Although not disclosed in the figure, it can be easily analogized.

〔The invention's effect〕

As described above, according to the present invention, a high-speed access auxiliary memory device such as a semiconductor memory device is preferentially used for the address space of the job requiring the cold response such as the TSS job or the online job. Because I will be able to
This has the effect of significantly improving the performance of the paging process for the job.

[Brief description of drawings]

FIG. 1 is a diagram showing the features of the positioning and control of the virtual memory control system of the present invention in the hierarchy of virtual memory, real memory, and auxiliary memory, and FIG. 2 is a diagram explaining the concept of virtual memory. The figure shows the relationship among the control blocks for implementing the virtual memory control method. Fig. 4 shows the meaning of job status words in the address space control block. Fig. 5 shows the paging.
Figure 6 shows details of the header of the device table, 6th
FIG. 7 is a diagram showing an operation flow of the main memory / virtual memory management program of FIG. 91: main memory / virtual memory management program, 95: address space control block, job status word in ASCB,
120 …… General purpose auxiliary memory, 140 …… High speed auxiliary memory, 96 …… Paging device index.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tokinori Ozawa 1-280, Higashi Koigakubo, Kokubunji City Central Research Laboratory, Hitachi, Ltd. (56) References JP 62-42248 (JP, A) JP 61- 48026 (JP, A) JP-A-58-51347 (JP, A)

Claims (6)

(57) [Claims] 1. In a computer system having a high speed auxiliary storage device and a low speed auxiliary storage device and having virtual storage, when a virtual space is allocated to a job to be executed, the attributes of the job are assigned to the virtual space. An auxiliary that writes in an information block containing information to be managed, and selects one of the high speed auxiliary storage device and the low speed auxiliary storage device as a paging device for a page to be allocated to the virtual space based on the written attribute. Storage device selection method. 2. The method for selecting an auxiliary storage device according to claim 1, wherein the attribute is an attribute relating to the type of the job. 3. The high-speed auxiliary storage device is selected when the type of the job represents a job that requires immediate response, and the low-speed auxiliary storage device is selected when the type of job does not require immediate response. The method of selecting an auxiliary storage device according to claim 2. 4. The high speed auxiliary storage device is selected when the job to be executed is an online job or a TSS job, and the low speed auxiliary storage device is selected when the job is a batch job. Auxiliary storage device selection method. 5. The method for selecting an auxiliary storage device according to claim 1, wherein the attribute is an attribute relating to the priority of the job. 6. The auxiliary according to claim 5, wherein the high speed auxiliary storage device is selected when the priority of the job to be executed is the highest priority, and the low speed auxiliary storage device is selected otherwise. Storage device selection method.