JPH0520786B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is directed to a multi-CPU (Central Processing Unit) system consisting of a plurality of processors.
It concerns the CPU startup device.

[Conventional technology]

FIG. 4 shows a CPU startup device for a conventional multi-CPU system disclosed in, for example, Japanese Unexamined Patent Publication No. 153559/1983. In the figure, 1 indicates a system control CPU;
2 ₁ to 2 _o+1 are CPU1 to CPU _o+1 , and 7 is a system bus.

Next, the operation will be explained. For example, if CPU _o+1 2 _o+1 , which has been in a faulty state, recovers from the fault and attempts to reconnect to the system bus 7 of the multi-CPU system and return to the system configuration, the system control CPU 1 , on CPU _o+1 2 _o+1 , e.g. the system control shown in Figure 5A.
A RUNI start command is given to the status table 10 when diagnosis, test processing and data processing are executed separately according to instructions from the CPU 1. Then, the CPU _o+1 2 _o+1 that received the RUN1 activation command of the status table 10 first refers to the program attribute table 11 shown in FIG. A program A having functions such as initialization associated with the process is executed. After that, CPU _o+1 2 _o+1 is the system control CPU 1
Therefore, RUN2 for status table 10
When a startup command is given, program attribute table 11
Select and execute application program B, such as calculation execution, for which the execution point has been set,
CPU _o+1 2 _o+1 enters the system.

[Problem that the invention seeks to solve]

The CPU startup device of a conventional multi-CPU system is configured as described above, so each CPU
The execution efficiency of each CPU decreases because the attributes of programs on the CPU must be controlled.
In a multi-CPU system, a program on one CPU is executed in synchronization with the execution of a program on another CPU, that is, waiting for the completion of execution of a program on one CPU before executing a program on another CPU. or start
There were problems such as the impossibility of starting programs on several CPUs at the same time.

This invention was made in order to solve the above-mentioned problems, and it effectively increases the execution efficiency of each CPU without requiring control of the program attribute table, and also enables multi-control
Although the CPU executes a certain CPU program,
The purpose of the present invention is to obtain a CPU startup device for a multi-CPU system that can execute a program while always synchronizing the execution of programs on other CPUs.

[Means for solving problems]

In the CPU startup device for a multi-CPU system according to the present invention, the system control CPU manages the startup of programs on each CPU and execution completion responses, and each CPU issues startup instructions to programs on its own CPU. The execution completion is managed.

[Effect]

CPU of multi-CPU system in this invention
The startup device improves the execution efficiency of the CPU by having the system control CPU give a startup command to each CPU, and receiving the execution completion response from the CPU that received the startup command and giving startup commands to other CPUs. At the same time, it enables synchronization between each CPU to execute programs.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In the figure, the same parts as in FIG. 4 are designated by the same reference numerals. In FIG. 1, 3 is a program startup control section, 4 is a program execution completion response control section,
5 ₁ to 5 _o+1 are program startup command reception units, 6 ₁
~6 _o+1 is the program execution completion response output part, 8 is
Programs _C , 9 ₁ , and 9 ₂ loaded into the _memory on the CPU o 2 o are programs D and E loaded into the memory on the CPU _o+1 2 _o+1 ). Further, FIG. 2 is an explanatory diagram of a program table of the present invention, and this program table is provided on the system control CPU 1. FIG. 3 is a flowchart showing the sequence of operations.

Next, the operation will be explained with reference to the flowchart shown in FIG. Although the status of each CPU is not particularly specified, consider, for example, a case where CPUs _o+1 2 _o+1 that are in a failure state participate in a multi-CPU system.
For example, suppose that programs D, C, and E need to be executed in this order for CPU _o+1 2 _o+1 to enter the system. As for the contents of programs D, C and E, program D has CPU _o+1 2 _o+1
program C generates the data needed by program E, and program E
CPU _o+1 2 A conceivable example is something that calculates data that _o+1 needs to prepare.

First, when CPU _o+1 (2 _o+1 ) is connected to system bus 7 (ST-1) and connected to a multi-CPU system, system control CPU 1 sends CPU _{o+ 1} 2 Sets a program start command to instruct the start of program D possessed by _o+1 (ST-2). This program start command is transferred to the program start command reception unit 5 _o+1 of the CPU _o+1 (2 _o+1 ) (ST-3). Through this operation, the CPU _o+1 2 _o+1 performs, for example, initial processing. The program _D91 having the function is executed (ST-4).
Then, after executing the program D9 ₁ , the CPU _o 2
If it is necessary to execute the program C loaded in _o , the CPU _o+1 2 _o+1 sets program execution completion in the program execution completion response output section 6 _o+1 (ST-5). This program execution completion signal is then transferred to the program execution completion response control section 4 of the system control CPU 1. Then, the program execution completion response control unit 4 refers to, for example, the program _{table 12} shown in FIG.
When it recognizes that the program is the same as above, it starts the program C(8) loaded into the CPU _o 2 _o via the program start control section 3 in the same manner as above. In addition, the second
The program table 12 shown in the figure is CPU _o+1 2 _o
+1 is set in advance in the system control CPU 1 as the name of the program to be executed in order when entering the system. Furthermore, if it is necessary to start program E9 2, which is an application program that executes an operation, for example, in order to cause CPU _o+1 2 _o+1 to enter the system, program E9 ₂ can be started in the same manner as above. By starting ₂ (ST-7),
CPU _o+1 2 _o+1 enters the multi-CPU system (ST-8). In this way, programs D and C
and E are executed in sequence. In the above embodiment, the case where a certain CPU enters the system was explained as an example, but each CPU that has already entered the system
Of course, it is possible to execute CPU programs synchronously.

〔Effect of the invention〕

As described above, according to this invention, multiple CPUs
A program startup control section and a program execution completion response control section are provided on the system control CPU so that the system control CPU can manage the startup and execution completion of the above programs, and each CPU has a program startup command reception section and a program execution Since the configuration includes a completion response output section, there is no need to manage the attributes of the program being loaded on each CPU itself. You can start running the program and
This has the effect of synchronizing program execution between each CPU.

[Brief explanation of drawings]

FIG.
A configuration diagram of the CPU system, Figure 2 is an explanatory diagram of the program table in Figure 1, Figure 3 is a flowchart showing the operation order of Figure 1, Figure 4 is a configuration diagram of a conventional multi-CPU system, and Figure 5 The figure is a status table diagram of a conventional multi-CPU system. In the figure, 1 is the system control CPU, 2 ₁ to 2 _o
+1 is a CPU, 3 is a program startup control unit, 4 is a program execution completion response control unit, 5 ₁ to 5n+1 are program startup command reception units, 6 ₁ to 6 _o+1 are program execution completion response output units, and 7 is a system bus. It is. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. In a CPU startup device for a multi-CPU system in which a system control CPU and each CPU are connected via a system bus, one of the CPUs that starts up
The program startup instruction that instructs the startup of the program that the CPU has that performs the startup processing of that CPU is
and then give it to each CPU.
a program start control unit that provides a program start command to instruct the start of a program owned by the CPU; a program table in which the execution order of each program to be executed following the program that performs the start process is set; A program execution completion response control unit is provided in the system control CPU, and upon receiving a program execution completion signal, requests the program start control unit to start the next program according to the program execution order listed in the program table. , and a program start command reception unit that receives the program start command from the system control CPU and starts the instructed program, and outputs the program execution completion signal to the system control CPU when the program execution is completed. A program execution completion response output unit is provided in each of the CPUs, and the system control CPU waits for the completion of execution of the program on the CPU that has given the program start command among the CPUs, and completes the execution in the program table. 1. A CPU startup device for a multi-CPU system, characterized in that a new program startup instruction is given to a CPU that has a program written next to a program that has been written.