JPH0460842A - Computer system - Google Patents

Abstract

PURPOSE:To preferentially process a transaction requiring emergency by providing a mode to designate the priority of executing a thread independently of the priority of executing a process. CONSTITUTION:A transaction priority registration part 7 is provided on the system thread 5 of an online transaction processing (OLTP) system 3 and when a system managing person or the like executes a transaction, the priority of the transaction can be arbitrarily designated by an interaction with the transaction priority registration part 7. When the priority is designated to the transaction (work thread). this work thread is separated from the thread schedule queue of this OLTP system 3 and the OLTP system 3 is integrated n an OS schedule queue so as to control the priority of the execution. Thus, the work thread requiring emergency can be executed preferentially to the flow of a process in the system as a whole.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides the execution priority of a thread, which is an execution unit smaller than a process, which is a basic unit of processing execution, based on the execution priority of the above-mentioned process. This invention relates to a computer system with functions that can be specified independently.

(Prior art) Operating system (O8) that supports multi-processing
) is usually called a process. This process control information is called a task control block (TCB), and one TCB is allocated to one process.

Now, from the operating system's point of view, one T
A process exists as one task running under the CB, but a thread exists as an execution unit smaller than this process. - In boat fishing, one process includes multiple threads, and these multiple threads can be executed in parallel under the same TCB. Furthermore, if the threads are reentrant, it is possible to execute these multiple threads in parallel. This type of dual processing unit of process and thread is used, for example, in online transaction processing (OL).
TP) often appears in systems, etc.

Now, in general, the form of data processing in an online environment is: (1) It is not known from which terminal, when, and in what order data will be input.

■ The input data is generally data for different operations and is processed in parallel at the same time.

It has the characteristics of. Based on these characteristics, conventional online systems are generally constructed from application programs and an OLTP system.

The 0LTP system basically consists of ■ A data communication device that controls terminals and lines, etc. ■ A system service function that calls the necessary business programs at the necessary time and executes the business programs in parallel ■ Files It is configured with data processing functions related to the input/output of data recorded in the database.

The entire online system that performs input/output of business programs and their control operates under scheduled TCBs, and the above-mentioned 0LTP system and the application business programs cooperate with each other as threads.
Work while communicating.

FIG. 4 shows the conceptual configuration of such an online system, where la, lb, to 1n are TCBs queued under the OS scheduler 2 and ranked according to execution priority. These TCBla, lb, ~I
OL T P 3 (3a, 3b, . . . ) is provided corresponding to n. Each of these 0LTPs 3 has a configuration in which a system thread 5 manages a plurality of business threads 4 (4a, to 4n) prioritized at the time of business program registration.

Therefore, when the business thread 4 issues an input/output request to a terminal or disk, it first issues an execution request to the system thread 5, and the system thread 5 that receives this request runs the O8 (OS scheduler 2). issue the execution request to.

The terminal definition and file definition 6 at this time are shared with the O8 through the system thread 5.

By having the system thread 5 manage input/output services and scheduling of the business thread 4 in this manner, the burden on, for example, a business program developer is greatly reduced.

By the way, since the OS scheduler 2 performs scheduling on a process-by-process basis, scheduling for the business thread 4 only needs to be performed based on the process priority within the 0LTP system 3. Such a scheduling method can be achieved by simply specifying the execution priority of the transaction (business thread) when the user develops and registers a business program in the 0LTP system 3. Therefore, the advantage is that the user only needs to be familiar with the 0LTP system 3.

However, when a plurality of 0LTP systems 3 are in operation, there is a problem in that even if there is a transaction that should be processed with priority, the above-described scheduling method cannot specify the priority. On the other hand, even for transactions that do not require much urgency, 0LT
Since the execution proceeds according to the priority in the P system, there is a drawback that it interferes with the processing of other transactions.

(Problem to be solved by the invention) In this way, in conventional systems, business programs are
When registering in the TP system and specifying its priority, the priority of the thread is determined based on the priority of the entire 0LTP system. For this reason, if multiple 0LTP systems are running on one computer system or multiple processes involving multiple processes are being performed, such as batch processing at the same time, it is necessary to process transactions that require urgency. is the 0LTP to which it belongs
It became necessary to reset the priority of the entire system (process) to a higher level. In addition, even if a transaction is low in urgency, if the priority of the 0LTP system to which it belongs is high, it will be processed in priority to more urgent transactions belonging to other 0LTP systems, which is a problem. Ta.

The present invention was made in consideration of these circumstances, and its purpose is to multi-process processes, which are the basic unit of processing execution, and to run multiple reentrant threads in parallel within one process. Alternatively, to provide a computer system that enables a computer equipped with an operating system capable of parallel execution to process urgent transactions with priority independent of the priority of the 0LTP system to which the transaction belongs. It is in.

[Structure of the Invention] (Means for Solving the Problems) The present invention multiprocesses processes, which are the basic unit of processing execution, and allows multiple reentrant threads to be executed in parallel or in parallel within one process. A computer system equipped with an operating system is characterized by having a mode in which the execution priority of a thread can be specified independently of the execution priority of a process.

It also has a mode in which the priorities of threads and processes are specified independently, and a mode in which the priority of the thread is determined depending on the priority of the process, and these modes can be used selectively. It is characterized by:

(Function) According to the present invention, it is possible to specify the execution priority of a thread independently of the execution priority of the entire 0LTP system, so business threads that require urgency are prioritized over the processing flow of the entire system. This makes it possible to perform execution processing.

Moreover, the priority set for the 0LTP system (T
It becomes possible to focus on only necessary business threads and set their priorities arbitrarily, regardless of the priority of the CB.

(Embodiment) Hereinafter, a computer system according to an embodiment of the present invention and a thread priority control method in this computer system will be described with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of an embodiment system, and the same parts as those in the system shown in FIG. 4 are denoted by the same reference numerals. The system of this embodiment is characterized in that a transaction priority registration unit 7 is provided in the system thread 5 of 0LTP3, and when a user such as a system administrator executes a transaction, he or she can interact with the transaction priority registration unit 7. The main point is that the priority of the transaction can be specified arbitrarily.

In order to set the priority of a transaction by the transaction priority registration unit 7, for example, as shown in the processing procedure shown in FIG. (step a). When the user specifies a priority in response to this inquiry, the execution priority for that transaction is set in O8, independent of the thread execution priority determined by the 0LTP system, according to the instruction ( Step b). In this case, the transaction (business thread) is 0LT, as the concept is shown in Figure 3.
Instead of P system 3's thread schedule queue,
Connect to and manage the schedule queue of O8 in the same way as that process (step C). However, in this case, the definition of the terminal and its management are shared with other business threads.

In other words, if a priority is specified for a transaction (business thread), that business thread is
A TC that is separated from the thread schedule queue in the TP system and manages each of the 0LTP systems 3.
At the same level as BI, it is incorporated into the OS schedule queue and its execution priority is controlled.

Note that if the user does not specify the priority, the execution of the transaction is left to the scheduler of the 0LTP system (step d). As a result,
The execution priority of the transaction is controlled in the same manner as other business threads based on the thread schedule queue of the 0LTP system 3.

In this way, in this system, the execution priority of the threads managed by the thread schedule queue in the 0LTP system is specified independently of the execution priority of the process managed by the O8 schedule queue, and the execution order is set as described above. It becomes possible to manage based on the OS schedule queue. As a result, urgent business threads are transferred to the process to which they belong (
It is possible to advance the execution priority without being influenced by the execution priority of the OLTP system. Conversely, the execution priority of business threads that do not require urgency can be delayed. Therefore, it is possible to efficiently control the execution of business threads belonging to each 0LTP system in order of urgency, without being defined by the execution priority of the processes described above.

Note that the present invention is not limited to the embodiments described above, and can be implemented with various modifications without departing from the gist thereof.

[Effects of the Invention] As explained above, according to the present invention, general transactions input by the user are executed according to the scheduling of the 0LTP system, and transactions that require urgency or have priority compared to general transactions are executed according to the scheduling of the 0LTP system. For low-level transactions, the execution order can be changed according to the user's specifications, independent of the process execution order.
It becomes possible to execute it separately from the TP system. As a result, it becomes possible to flexibly specify priorities for various transactions, and it becomes possible to ensure response time and throughput according to the set priorities.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a schematic configuration of a computer system according to an embodiment of the present invention, Fig. 2 is a diagram showing a procedure for setting transaction priorities in the embodiment system, and Fig. 3 is a diagram showing a procedure for setting transaction priorities in the embodiment system. FIG. 4, which is a diagram showing the concept of priority setting processing, is a diagram showing an example of the construction of a conventional 0LTP system. 1 (1a, 1b, ~In)...Task control block (TCB), 2...Operating system (O8) scheduler, 3 (3a, ~3n) -
...Online transaction processing (OLTP) system, 4 (4a, ~4n)...Business thread (
transaction), 5...0LTP system thread, B...terminal definition/file definition, 7...transaction priority registration section. Applicant's agent Patent attorney Suzue Kodo

Claims (2)

[Claims] (1) In a computer system equipped with an operating system that multi-processes processes, which are the basic unit of processing execution, and can execute multiple reentrant threads in parallel or in parallel within one process, priority is given to thread execution. A computer system comprising a mode in which execution priority of a process can be specified independently of the execution priority of a process. (2) The method according to claim (1), further comprising a mode in which the priorities of threads and processes are specified independently, and a mode in which the priority of the thread is determined depending on the priority of the process. computer system.