JPH03122753A - Processor control system - Google Patents

Abstract

PURPOSE:To dynamically change the number of driven processors without stopping a system by setting up the state of each processor to a fixed state to integrate the processor. CONSTITUTION:Three states, i.e. a driven state (ALIVE), a stopped state (DEAD) and a transfer state (FETUS) from the stopped state to the driven state, are prepared as the states of each processor. In the case of newly integrating a processor into the system, the FETUS processing of the processor concerned is executed after checking the DEAD state of the processor to request the integration of the processor. The processor receiving the request checks its own FETUS state and then executes processing for turning itself to the ALIVE state. A task scheduler allocates a task to the ALIVE processor. Consequently, the number of processors can be dynamically changed during the operation of the system.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a multiprocessor system.

It is possible to dynamically change the number of operating processors without stopping the system. Regarding processor management methods.

[Prior art and its problems] In the conventional (7) two-state processor management system of ALIVE and DEAD, in order to implement processing for incorporating a processor, other processors must be connected.

Direct ALIV of the state of the processor to be incorporated
The only way to achieve this was to change it to E. In this implementation method, if a processor newly incorporated into the system is malfunctioning and cannot be operated, the processor is marked as ALIVE even though it is not actually operating.

The system appears to be working.

Therefore, when a request is issued to the corresponding processor from another processor on the system, the request is placed in an eternal waiting state for the processing to be completed. In the conventional system, due to the above-mentioned problems, it was not possible to install a new processor while the system was in operation.

[Means for Solving the Problems] A processor management method according to the present invention uses a processor state as a processor state.

a) A state in which the own processor is recognized as operating from the perspective of all processors in the multiprocessor system (hereinafter this state will be referred to as ALIVE).

b) A state in which the own processor is recognized as stopped from the perspective of all processors in the multiprocessor system (hereinafter this state will be referred to as DEAD); and 2) C) Only the own processor recognizes that the own processor is operating.
It also has a state (hereinafter this state will be referred to as FETUS) in which the own processor is recognized as stopped from the perspective of other processors.

b) means for issuing a disconnection request to a processor whose processor status is ALIVE;

口) The processor that received the disconnection request.

Means for setting the processor state to DEAD and disconnecting the processor after performing processing to be completed before the disconnection operation.

c) means for requesting integration into a processor whose processor status is DEAD;

2) The processor that received the incorporation request.

After setting the processor state to FETUS and performing the processing that should be completed by one installation operation, change the processor state to ALI.
It is characterized in that it has a means for making it a VE and incorporating a processor.

[Example] Next, an example of the present invention will be described with reference to FIG.

First of all, the states of the processor are: an operating state (hereinafter referred to as AL I VE), a stopped state (hereinafter referred to as DEAD), and a transition state from a stopped state to an operating state (hereinafter referred to as this state). (written as FETUS).

The AL
IVE is a state in which all processors in the system recognize that their own processor is operating, and DEAD is a state in which all processors in the system recognize that their own processor is stopped.

FETUS refers to a state in which only the own processor recognizes that the own processor is operating, and other processors recognize that the own processor is in a stopped state.

When disconnecting a failed processor from the system while the system is in operation, first confirm using PSIOI that there are multiple processors currently in operation. This is because when there is only one processor in one operating state, if that processor is disconnected, the system will stop. after that.

In PS102, the target processor of the stop request is ALIVE.
After confirming that this is the case, the PS 103 issues a disconnection request to the target processor to disconnect the processor from the system. Then, the target processor receives the request at PS104 and sends it to PS105.
Then, by connecting the task that was running on that processor to the task running queue, the processing of that task is interrupted without being terminated. The suspended task is assigned by the scheduler to run on another processor. After interrupting the task, the corresponding processor performs processing to set itself to DEAD at PS106, and then stops the operation of the processor at PSlol. By performing the above operations, it becomes possible to disconnect the relevant processor from the system without stopping the system.

On the other hand, when you want to incorporate a new processor into the system, use the PS108 to confirm that the new processor to be incorporated into the system is DEAD, and then
In S109, a request for incorporation is made to the corresponding processor by performing processing to make the corresponding processor FETUS. At P5110, the processor that received the request:
After confirming that it is FETUS at PS11, it performs processing to make itself ALIVE at PS112. A task scheduler allocates tasks to processors whose processor status is ALIVE. By performing the above operations, it becomes possible to incorporate a new processor into the system without stopping the system.

[Effect of the invention] As is clear from the above description, according to the present invention.

Number of processors in system operation.

It can now be changed dynamically, eliminating the need to stop the system to increase the number of processors while the system is running or to remove a failed processor from the system. Also, it is now possible to increase the number of processors while the system is running.

When the system starts up, there is no need to wait for all processors to start working, and only the first processor that starts up starts working, and other processors
It is now possible to increase the number of processors in the system by issuing an integration request after the system is operational, allowing the system to start up quickly.

[Brief explanation of drawings]

FIG. 1 is a flowchart for explaining a processor management method according to an embodiment of the present invention. PSlol to PS103 indicates the process of requesting a processor to be disconnected, and PS104 to PSlol indicates the process of the processor receiving the request to disconnect;
S108 to PS109 represent processing for requesting processor installation, and PSllo to PS112 represent processing for installation by the processor that has received the request.

Claims (1)

[Claims] 1. In a multiprocessor system having a plurality of processors connected to each other, the processor state of each processor is: a) When viewed from all the processors in the multiprocessor system, the own processor is in operation. b) a second state in which the own processor is recognized as stopped from the viewpoint of all processors in the multiprocessor system; and c) only the own processor is in the stopped state. Recognizes the operation of the processor,
and a third state in which the own processor is recognized as stopped from the perspective of other processors; (a) a disconnection request means for requesting disconnection from the processor whose processor status is in the first state; ) a disconnection execution means for changing the processor state to the second state and disconnecting the processor after the processor that has received the disconnection request performs processing to be completed before the disconnection operation; c) a processor state that is set to the second state; (d) After the processor that has received the incorporation request performs the processing to be completed before the incorporation operation, the processor state is changed to the third state. a processor management method, comprising: an installation execution means for bringing the processor into the first state and installing the processor. 2. The disconnection request means includes means for confirming that there are a plurality of operating processors, and means for confirming that the target processor of the stop request is in the first state;
means for issuing a disconnection request to the target processor; the disconnection executing means includes means for receiving the disconnection request in the target processor; and means for connecting a task running in the target processor to a running queue; means for bringing the target processor into the second state;
2. The processor management method according to claim 1, further comprising means for stopping operation of said target processor. 3. The incorporation requesting means has means for confirming that the processor to be incorporated into the multiprocessor system is in the second state, and means for making an incorporation request to the processor to be incorporated, and the incorporation execution means means for the processor to be installed to receive the request for installation; means for confirming that the processor to be installed is in the third state; and means for bringing the processor to be installed into the first state. 2. The processor management method according to claim 1, comprising: