JPH04296964A - Sub-cpu start control system - Google Patents

Abstract

PURPOSE:To omit the waiting time of a main CPU by changing the starting order of sub-CPUs according to the starting propriety of the sub-CPUs when these sub-CPUs are started by the main CPU. CONSTITUTION:A main CPU 1 starts successively the sub-CPUs 4, 6 and 8. If one of these sub-CPUs could not be started since it is under processing, this sub-CPU is skipped and the next sub-CPU is started. At the same time, the starting order of the skipped sub-CPU is changed and recorded in a memory 2. The subsequent sub-CPU 4, 6 and 8 are started in the order recorded in the memory 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sub-CPU activation order in a computer system composed of a plurality of CPUs.

0002

2. Description of the Related Art FIG. 3 shows a conventional sub-CPU startup management system. In this method, a sub-CPU activation management program mechanically activates each sub-CPU in a fixed order.

Next, the operation will be explained. When the sub-CPU activation management program is activated, processing begins. (Step 22) The sub-CPU activation management program first investigates whether the sub-CPU 1 is in a bootable state. (Step 23) If the state is ready to start, sub CPU1
(Step 24) Next, it is investigated whether the sub CPU 2 can be started. (Step 25) If the sub CP
If U1 is not in the bootable state, wait until the sub CPU1 becomes bootable, and then start the sub CPU1. (Step 23) From then on, the above process is repeated for the number n of sub-CPUs. (Steps 25 to 28) When all of the above processing is completed, the processing for that cycle is completed (Step 29), and the sub CPU activation management program is activated again.

0004

[Problem to be Solved by the Invention] The conventional sub-CPU startup management method performs the processing described above, so if the sub-CPU cannot be started, it must wait until it becomes possible to start. Processing cannot be performed on the main CPU side, so it is necessary to lengthen the periodic period, resulting in problems such as slow processing speed.

The present invention has been made to solve the above-mentioned problems, and its purpose is to eliminate the waiting time of the main CPU and improve processing speed.

[0006]

[Means for solving the problem] Sub-CP according to the present invention
The U startup management method skips the startup of the sub CPU if it is unable to start it when the main CPU starts the sub CPU, and uses a modified startup method so that the same skip processing is not performed in subsequent cycles. Store the order in memory.

[0007]

[Operation] The sub-CPU starting method in this invention stores the starting order in memory and starts up according to that order. Therefore, if the sub-CPU cannot be started, the starting order is changed and the changed starting order is changed. By storing them in memory, they will be activated in the changed order in subsequent cycles.

[0008]

Embodiment FIG. 1 shows an embodiment of the invention. Main CPU1
performs upper-level processing for the sub CPUs 4, 6, and 8 while making the sub CPUs 4, 6, and 8 of the slave stations 5, 7, and 9 work. Communication is performed in order with each sub CPU through the transmission line 10, but if any sub CPU cannot be started due to processing etc., the start up is skipped and the changed start order is changed to the memory 2 in the main station 3. Store. In subsequent cycles,
Main CPU 1 refers to memory 2 while sub CPU 4
, 6, and 8.

FIG. 2 shows a flowchart of this sub-CPU startup method. When the sub-CPU activation management program is activated, processing begins. (Step 11) Sub CP
The U boot management program first investigates whether the sub CPU 1 is in a bootable state. (Step 12) If the state is ready to start, start sub CPU1 (Step 13)
Next, it is investigated whether the sub CPU 2 can be started. (Step 15) If sub CPU1 is not in a bootable state,
The processing of the sub CPU is skipped, the startup order is changed, and the result is stored in the memory 2. (Step 14) Sub CP
The above process is repeated for the number n of U's. (Step 15
~20) When all of the above processes are completed, the process for that cycle is completed (step 21), and the sub CPU activation management program is activated again. In subsequent cycles, the devices are activated in accordance with the changed activation order and the activation order recorded in the memory 2. This process is performed every cycle and is always activated in the optimal order.

[0010]Although the above embodiment concerns a computer system composed of a plurality of CPUs, even in the case of a single CPU, it is composed of a plurality of modules.
Naturally, the present invention can also be applied to cases where the module is activated periodically.

[0011]

As described above, according to the present invention, the main CPU can measure the timing with other sub-CPUs and always start them in the appropriate order, eliminating the waiting time of the main CPU and increasing the speed of computer processing. becomes possible.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a computer system showing a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the sub-CPU activation management method according to the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating a conventional sub-CPU activation management method.

[Explanation of symbols]

1 Main CPU 2 Memory 4 Sub CPU 6 Sub CPU 8 Sub CPU

Claims (1)

[Claims] Claim 1: In a sub-CPU activation management method for a computer system in which one main CPU sequentially and periodically activates a plurality of sub-CPUs to perform processing, whether or not the sub-CPUs activated by the main CPU can be activated or not. A sub-CPU startup management method characterized by changing the startup order of sub-CPUs.