JPH02214963A - Dynamic real memory control system for processing program of transaction assigning shared space - Google Patents

Abstract

PURPOSE:To assign an effective real memory to a batch processing task by changing dynamically a non-resident discriminator stored in a control table for decision of non-residence of a shared space real memory. CONSTITUTION:A real memory control part 7 is prepared together with a shared space real memory non-residence decision control table 8. Then a fact whether a real memory assigned into a shared space should be returned to a memory loop of a virtual computer or not in accordance with the using frequency of a shared space assignment transaction TX is set to a non-residence discriminator stored in the table 8. Then the assignment state of the real memory is dynamically released to the shared space by reference to the non-residence discriminator and in accordance with the load fluctuation of the working TX of a TX processing system. As a result, the shared space assignment TX processing program never occupies the real memory when the TX has a low load. Then the real memory is effectively used.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a real memory control method for a transaction (hereinafter abbreviated as TX) processing system executed by multiple processes running on a virtual memory computer, and in particular, The present invention relates to a dynamic real memory control method for a TX processing program (hereinafter referred to as a shared space allocated TX processing program) placed on real memory allocated to a shared space that can be referenced by processes.

[Conventional technology]

In conventional TX processing systems, shared space-based TX processing programs are subject to page faults (
MPF), it is loaded onto the real memory from the executable program file (RU), and after that it resides on the real memory. Therefore, the shared space arrangement TX processing program is
If it operates even at -100 degrees, in most cases it will reside in the real memory regardless of the frequency of use, and it will occupy the real memory, which is a shared resource.

Freeing and reallocation of the real memory in which the shared space-located TX processing program resides is handled by the operating system (
The shared space arrangement TX is reviewed by the real memory management control unit (real memory control program (DMM)) of O8).
Since the processing program is referenced by multiple processes, the logic that does not reduce the processing performance of the program is to keep the number of loads from the executable program file triggered by a page fault fault to a low level. The degree of review is extremely small compared to the TX processing program located in real memory.

In virtual memory computers with large-scale memory configurations,
Although it can be said that there is almost no performance deterioration due to a reduction in the amount of memory due to the exclusive use of real memory by the shared space allocated TX processing program, in a virtual memory computer with a small to medium memory configuration, it is necessary to operate the TX processing system. ,
Since it is necessary for performance to place the TX processing program on the real memory allocated to the shared space, performance will be degraded.

For example, even in virtual memory computers with small to medium-sized memory configurations, parallel processing of batch processing operations is generally performed during operation of the TX processing system, and in particular, parallel processing of batch processing operations is performed over a long period of time, such as in an online TX processing system that operates 24 hours a day. When performing business-specific operations based on axes, or when running batch processing programs in parallel when the TX load is low, it is necessary to allocate real memory to the batch processing program in order to use the real memory exclusive to the TX processing program located in a shared space. Even if you try to assign
The process of replacing the changed page save file (BS) with unused real memory pages increases the input/output Cl10) of the changed page save file and increases the consumption of the central processing unit (CPU) by the real memory management control unit. This will affect the entire storage computer, and will affect not only the batch processing operations but also the response of the TX processing system.

[Problem to be solved by the invention]

In the real memory control method of the conventional transaction processing system described above, even if the TX is in a low load state for a long time, the shared space ITX processing program resides in the real memory and remains exclusive of the real memory. When a batch processing program runs in parallel with a TX processing program on a virtual memory computer, the increase in batch processing operations accelerates the increase in CPU consumption in the real memory management control unit, causing not only delays in batch processing operations but also delays in batch processing operations. , which has the disadvantage of leading to processing delays in the TX processing system. Particularly in an online TX processing system, there is a problem in that this delay immediately leads to a deterioration in response.

In view of the above-mentioned points, it is an object of the present invention to determine whether or not to return real memory allocated to a shared space to a memory pool of a virtual memory computer depending on the usage frequency of a shared space allocation TX processing program. In addition to setting it in the non-resident discriminator in the non-resident determination management table, the non-resident discriminator in the shared space real memory non-resident determination management table is referenced to determine whether the real memory in the shared space is To provide a dynamic real memory control method for a shared space-located transaction processing program that enables dynamic release of memory allocation status and effective allocation of real memory to batch processing tasks in a virtual memory computer. There is a particular thing.

[Means to solve the problem]

The dynamic real memory control method of the shared space allocated transaction processing program of the present invention is activated in accordance with the algorithm of the transaction processing system in a transaction processing system executed by a plurality of processes running on a virtual memory computer, and determines whether the real memory in the shared space is non-resident. A transaction processing program non-resident determination means refers to a non-resident discriminator in a management table to determine whether or not a shared space-located transaction processing program is subject to a batch page release request; transaction processing program non-resident requesting means for requesting a bulk page release to the real memory management control unit of the operating system when it is determined that the placed transaction processing program is subject to a bulk page release request; Referring to the non-resident discriminator in the spatial real memory non-resident determination management table, it is determined whether the shared space allocated transaction processing program is resident on the real memory allocated to the shared space. A transaction processing program residency determination requesting means for requesting a bulk page load to the memory management control section, a transaction processing program migration control means for passing control to the procedure section of the transaction processing program located in the shared space, and from this transaction processing program migration control means. A transaction processing program usage calculation means that sets a resident status to a non-resident identifier in the shared space real memory non-resident determination management table when the shared space allocated transaction processing program is started and used frequently; and an operation included in the transaction processing system. transaction processing program non-resident changing means for dynamically changing the non-resident discriminator in the shared space real memory non-resident determination management table by a command function;

[Effect]

In the dynamic real memory control method of the shared space allocated transaction processing program of the present invention, the transaction processing program non-resident determination means is started according to the algorithm of the transaction processing system and refers to the non-resident discriminator in the shared space real memory non-resident determination management table. The transaction processing program non-resident requesting means determines whether or not the co-located space-located transaction processing program is to be made the target of the batch page release request, and the transaction processing program non-resident requesting means makes the shared space-located transaction processing program the subject of the batch page release request. If it is determined that this is the case, a batch page release request is made to the real memory management control unit of the operating system, and the transaction processing program resident determination request means uses the transaction input as a trigger to release the non-resident discriminator in the shared space real memory non-resident determination management table. determines whether the shared space allocated transaction processing program is resident on the real memory allocated to the shared space by referring to the shared space, and if it is not resident, requests the real memory management control unit to load a page in bulk; When the transaction processing program migration control means passes control to the procedure section of the coexistence space-located transaction processing program, and the transaction processing program usage calculation means is activated by the transaction processing program migration control means, and the usage frequency of the shared space arrangement transaction processing program is high. sets the resident status to the non-resident discriminator in the shared space real memory non-resident determination management table, and the transaction processing program non-resident change means uses the operation command function of the transaction processing system to set the non-resident discriminator in the shared space real memory non-resident determination management table. change dynamically.

〔Example〕

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

FIG. 1 is a block diagram showing the configuration of a dynamic real memory control method for a shared space-located transaction processing program according to an embodiment of the present invention. The dynamic real memory control method of the shared space arrangement transaction processing program of this embodiment includes a TX processing program resident determination requesting means 1, a TX processing program migration control means 2, a TX processing program usage calculation means 3, and a TX processing program Non-resident change means 4
, TX processing program non-resident determination means 5, TX processing program non-resident requesting means 6, and real memory management control section 7
, a shared space real memory non-resident determination management table 8, an execution program file (RU) 9, a changed page save file (BS) 10, an execution program file link information table 11, a communication processing control unit 12, and an input means. It consists of 13. In addition, in Fig. 1, the reference numeral 10
0 indicates the TX processing system.

Referring to FIG. 2, the processes in the TX processing program residency determination requesting means 1 include a step 21 for determining the presence or absence of a shared space arrangement TX processing program, a step 21 for extracting a block page load segment descriptor, and a step 23 for requesting a block page load. It consists of.

Referring to FIG. 3, the processing in the TX processing program usage calculation means 3 includes a TX processing program name acquisition step 31 and a usage count and reuse interval time setting step 3.
2, a use count determination step 33, a reuse interval time determination step 34, and a resident status setting step 35.

Referring to FIG. 4, the processing in the TX processing program non-resident changing means 4 consists of an input parameter check step 41, a fraud determination step 42, a resident status/non-resident status setting step 43, and a rejection message notification step 44. .

Referring to FIG. 5, the processing in the TX processing program non-resident determination means 5 includes a TX load situation determination step 51, a block page release request shared space device TX processing program presence determination step 52, and a block page release segment descriptor A list creation step 53, a block page release segment descriptor list setting step 54, and a T
This step consists of a step 55 for activating the X processing program non-resident requesting means.

Referring to FIG. 6, the processing in the TX processing program non-resident requesting means 6 consists of -bloc page release segment descriptor retrieval step 61, -bloc page release request step 62, and segment descriptor list final determination step 63. .

Referring to FIG. 7, the shared space real memory non-resident determination management table 8 is created when the TX processing system 100 is generated, and contains a TX identifier, a TX processing program sequence pointer, a TX processing program name, and a non-resident discriminator. ,
The number of uses and the reuse interval time are stored. Note that the non-resident identifier is initialized to non-resident status.

Referring to FIG. 8, the execution program file link information table 11 is generated when the execution program file 9 is created, and contains the main program name, main program segment descriptor, and other information corresponding to the page load/release segment descriptor. A plurality of subprogram names and a plurality of subprogram segment descriptors are stored.

Next, the operation of the dynamic real memory control method of the shared space arrangement transaction processing program of this embodiment configured as described above will be explained.

The first T in the TX processing program sequence that constitutes TX processing
When a TX having a TX identifier corresponding to an X processing program is input from the input means 13, the TX processing system 100
Then, control is passed to the TX processing program resident determination requesting means 1 via the communication processing control section 12.

The TX processing program resident determination requesting means 1 determines whether the page of the TX processing program string corresponding to the TX identifier is shared depending on whether the non-resident identifier in the shared space real memory non-resident determination management table 8 is a resident status. It is determined whether the memory is resident on the real memory allocated to the space (step 21). If the page of the TX processing program string corresponding to the TX identifier is not resident on the real memory allocated to the shared space, the TX processing program residency determination requesting means 1 sends the segment of the TX processing program string corresponding to the TX identifier. Execute segment descriptor shown in program file link information table 1
1 (Step 22), a batch page load request is made to the real memory management control unit 7 for the segment indicated by the extracted segment descriptor (Step 23). Note that if the page of the TX processing program sequence corresponding to the TX identifier is resident on the real memory allocated to the shared space, the TX processing program residency determination requesting means 1 ends the process without doing anything.

When the real memory management control unit 7 receives a bulk page load request, the real memory management control unit 7 allocates the shared space from the execution program file 9 to the shared space in units of segment size specified by the real memory management control unit 7 in response to the detected page fault. The segment of the TX processing program sequence corresponding to the TX identifier is page-loaded into the real memory at once.

The TX processing program migration control means 2 causes the TX processing program resident determination requesting means 1 to transfer the Tx that corresponds to the TX identifier.
When it is determined that the page of the X processing program sequence is resident on the real memory allocated to the shared space, and the TX corresponding to the TX identifier is stored on the real memory allocated to the shared space by the real memory management control unit 7. When the segments of the processing program sequence are page loaded at once, control is transferred to the procedure section of the TX processing program located in the shared space, and at the time of this transfer, the TX processing program usage calculation means 3 is activated.

The TX processing program usage calculation means 3 collects information indicating which shared space arrangement TX processing program frequently operates on the current TX processing process, and makes resident the shared space arrangement TX processing program with high reusability. select. Specifically, the TX processing program usage calculation means 3 acquires the TX processing program name of the current shared space arrangement TX processing program from the execution program file link information table 11 (step 31), and determines the use of the current shared space arrangement WTX processing program. The number of times and reuse interval time are set in the coexistence space real memory non-resident determination management table 8 (step 32). Next, the TX processing program usage calculation means 3 compares the number of uses of the current shared space arrangement TX processing program with the specified number of uses given in advance at the time of system generation (step 33), and determines that the number of uses is greater than the specified number of uses. Sometimes, the reuse interval time of the current shared space arrangement TX processing program is compared with the specified reuse interval time given in advance at the time of system generation (step 34).
. If the number of uses exceeds the specified number of uses and the reuse interval time is smaller than the specified reuse interval time, it means that the frequency of use of the current shared space arrangement TX processing program is high, so the TX processing program usage calculation means 3 - The current shared space arrangement TX from the target of the bulk page release request
In order to remove the processing program, the resident status is set in the non-resident identifier in the shared space real memory non-resident determination management table 8 (step 35). If the number of uses does not exceed the specified number of uses or the reuse interval time is greater than the specified reuse interval time, the TX processing program usage calculation means 3 calculates that the frequency of use of the current shared space arrangement TX processing program is high. It is assumed that there is no one, and the process of step 35 is skipped.

The TX processing program non-resident changing unit 4 is activated at any time by the operation command function of the TX processing system 100, and dynamically changes the non-resident discriminator in the shared space real memory non-resident determination management table 8.

Specifically, when an operation command is input from the input means 13 via the communication processing control section 12, the TX processing program non-resident changing means 4 checks the TX processing program name which is an input parameter of the operation command (step 41).
, if the TX processing program name is not invalid (step 42), the resident status or non-resident status corresponding to the operation command is set to the non-resident identifier corresponding to the TX processing program name in the shared space real memory non-resident determination management table 8. (Dynamically change the non-resident discriminator) (step 43). If the TX processing program name is invalid in step 42, the TX processing program non-resident changing means 4:
The rejection message is returned via the communication processing control unit 12 to the input means 13 that is the input source of the operation command (step 44
).

The TX processing program non-resident determination means 5 is activated according to the algorithm of the TX processing system 100, and first
The TX load status in the processing system 100 is determined (step 51). When the TX load status is low, the TX processing program non-resident determination means 5 determines whether the non-resident status is set in the non-resident identifier in the shared space real memory non-resident determination management table 8 or whether the resident status is set. Based on this, it is determined whether there is a shared space layout TX processing program that requests a batch page release (step 52). If the TX load status is low and there is a shared space-located TX processing program that requests bulk page release, the TX processing program non-resident determination means 5 determines -
Segment description for requesting bulk page release of the shared space layout TX processing program based on the segment descriptor in the execution program file link information table 11 corresponding to the TX processing program name of the shared space layout TX processing program requesting bulk page release. A child list is created (step 53). Next, the TX processing program non-resident determination means 5 sets the created segment descriptor list in the local data area specific to the current TX processing process (step 54), and activates the TX processing program non-resident requesting means 6 (step 55). ). Note that if the TX load status is high or if there is no shared space-located TX processing program that requests bulk page release, the TX processing program non-resident determination means 5 skips the processing of steps 53 to 55.

The TX processing program non-resident requesting means 6 extracts a segment descriptor for a batch page release request from the segment descriptor list of the local data area specific to the current TX processing process (step 61), and requests the real memory management control unit 7 to do so. A batch basis release request is made (step 62). The TX processing program non-resident requesting means 6 repeats the -batch page release request up to the last segment descriptor in the segment descriptor list (step 63), and ends the process.

Upon receiving a bulk page release request, the real memory management control unit 7 saves the segments of the TX processing program sequence on the real memory allocated to the shared space to the changed page save file 10, and releases the real memory to the shared space. Release the allocation status of.

〔Effect of the invention〕

As explained above, the present invention uses a shared space real memory non-resident determination management table that determines whether or not to return the real memory allocated to the shared space to the memory boolean of the virtual machine according to the usage frequency of the shared space allocation TX processing program. In addition to setting the non-resident discriminator in the shared space real memory non-resident discriminator in the shared space real memory non-resident determination management table according to the TX load fluctuation during operation of the TX processing system, the allocation state of real memory to the shared space is determined. By making it possible to release dynamically, the shared space TX processing program no longer monopolizes the real memory when the TX load is low, and real memory is allocated in a timely manner when the batch processing program is running. This has the effect of ensuring stable operation of the TX processing system and effective use of real memory.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a dynamic real memory control method for a transaction processing program located in a shared space according to an embodiment of the present invention, and FIG. 2 is a process of the TX processing program residency determination requesting means in FIG. FIG. 3 is a flowchart showing the processing of the TX processing program usage calculation means in FIG. 1, FIG. 4 is a flowchart showing the processing of the TX processing program non-resident changing means in FIG. 1, and FIG. 1. FIG. 6 is a flowchart showing the processing of the TX processing program non-resident requesting means in FIG. 1. FIG. 7 is a flowchart showing the processing of the TX processing program non-resident requesting means in FIG. FIG. 8 is a diagram showing the contents of the non-memory resident determination management table. FIG. 8 is a diagram showing the contents of the execution program file link information table in FIG. In the figure, 1... TX processing program residency determination requesting means, 2...
- TX processing program migration control means, 3... TX processing program usage calculation means, 4... TX processing program non-resident changing means, 5... TX processing program non-resident determination means, 6... TX processing program non-resident request means,
7... Real memory management control unit, 8... Shared space real memory non-resident determination management table, 9... Execution program file (RU), lO...
Changed page save file (BS), 11... Execution program file link information table, 12... Communication processing control unit, 13... Input means. Funeral map up 'V-Rate D-T/Release judgment

Claims (1)

[Scope of Claims] In a transaction processing system executed by a plurality of processes running on a virtual memory computer, the process is started according to an algorithm of the transaction processing system and shared by referring to a non-resident discriminator in a shared space real memory non-resident determination management table. A transaction processing program non-resident determination means for determining whether or not a space-located transaction processing program is subject to a batch page release request; a transaction processing program non-resident requesting means that requests the real memory management control unit of the operating system to release all pages in a batch when it is determined that the non-resident resident discriminator in the shared space real memory non-resident determination management table is triggered by the input of a transaction; Determine whether or not the shared space allocated transaction processing program is resident on the real memory allocated to the shared space by referring to , and if it is not resident, issue a batch page load request to the real memory management control unit. transaction processing program residency determination requesting means; transaction processing program migration control means for passing control to the procedure section of the transaction processing program located in the shared space; a transaction processing program usage calculation means that sets the resident status to the non-resident discriminator in the shared space real memory non-resident determination management table if the value is high; 1. A dynamic real memory control method for a transaction processing program located in a shared space, characterized by comprising a transaction processing program non-resident change means for dynamically changing a non-resident discriminator in the transaction processing program.