JPH04303253A - Composite electronic computer system - Google Patents

Abstract

PURPOSE:To efficiently access a file by distributing management of file resources among electronic computers. CONSTITUTION:Processors 11 to 14 have file catalog director tables T1 to T4, and resource names file resources to which the use right is assigned are registered in tables T1 to T4. A master processor (P2) 12 manages contents of file catalog director tables T1 to T4 of all processors. Therefore, each of processors 11 to 14 refers to its own table to recognize whether the use right is assigned or not, this processor directly accesses the file when it is assigned; but when it is not assigned, the processor inquires the management source processor name having the use right of the master processor (P2) 12 and requests the management source processor to access the file.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a complex computer system constructed by connecting a plurality of computers that share file resources under exclusive control.

0002

2. Description of the Related Art In general, the following two methods are known as methods for file exclusive control and shared buffer control in a complex computer system constructed by connecting a plurality of computers.

(i) A shared memory that can be referenced by all computers in the complex computer system is provided, and information for file exclusive control is stored therein.

[0004] In this method, information that must be commonly referenced by all computers, such as file exclusive control, is placed on the shared memory, and is referenced/updated by all computers. Therefore, this method has the problem that it takes time to access the shared memory and a lot of time to access files.

(ii) Exclusive file control is performed by entrusting all shared control to a specific computer.

[0006] In this system, one certain electronic computer performs file exclusive control in accordance with requests from other electronic computers. Therefore, in this method,
This has the drawback that the load is concentrated on the electronic computer that performs file exclusive control, reducing the throughput of the entire system.

[0007]

[Problems to be Solved by the Invention] Conventionally, when information that must be commonly referenced by each computer that constitutes a complex computer system is stored in a shared memory, it takes a lot of time to access the file. If all shared control was left to an electronic computer, the throughput of the entire system would be reduced.

[0008] The present invention has been made in view of the above points, and an object of the present invention is to provide a complex computer system that can distribute file resource management among computers and efficiently execute file access. With the goal.

[0009]

[Means and effects for solving the problems] This invention has the following features:
In a complex computer system including multiple computers that share file resources, each computer has a resource management table that manages resource names of file resources to which use rights have been assigned to the computer itself, and this resource management table. means for determining whether the management source of the file resource to be requested for use is the own device by referring to the file resource, and accessing the file resource when the management source for the file resource to be used for the use request is the own device; means for inquiring the master computer for the name of the managing computer when the file resource to be used is not managed by the device itself; and means for inquiring the name of the managing computer from the master computer to the file to be requested to use a resource management table for managing resource names of file resources to which usage rights have been assigned to a master computer in the plurality of computers for each computer; means for checking the name of the computer that manages the file resource subject to the usage request by referring to a resource management table; The name of the managing computer is notified to the computer making the inquiry, and when the name of the managing computer for the file resource to be requested to use is not registered in the resource management table, the computer making the inquiry is the computer to which the request is made. The present invention is characterized by comprising means for allocating a file resource to a managing computer.

[0010] In this composite computer system,
Each computer has a resource management table, and the resource names of file resources to which usage rights are assigned are registered in the resource management table. Further, one predetermined computer operates as a master computer, and the resource names of file resources to which usage rights are assigned are registered in the resource management table for all computers. Therefore, each computer recognizes whether or not it has usage rights by referring to its own management table. If it has usage rights, it directly accesses the file, and if it does not have usage rights, it accesses the file directly. Inquire about the name of the managing computer that has usage rights to the computer, and request file access from that managing computer. Therefore, management of file resources can be distributed among computers, and file access can be efficiently executed under exclusive control.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the system configuration of a composite computer system according to an embodiment of the present invention.

This composite computer system constitutes a loosely coupled multiprocessor system, and includes four processors (P1 to P4) 11 to 14, an interprocessor communication device 15, and a mass storage controller (MSC).
) 16 and a shared disk subsystem 17.

[0014] Four processors (P1 to P4) 11 to 1
Each of the processors (P1 to P4) 11 to 14 is connected to a plurality of terminal devices (not shown). .

These processors (P1 to P4) 11 to 1
4 is a mass storage controller (MS) as required.
C) Issue a request to the shared disk subsystem 16 to update, reference, etc. a plurality of file resources stored in the shared disk subsystem 17. In this case, in order to use these file resources under exclusive control among the processors (P1 to P4) 11 to 14, file resources to be managed are assigned to the processors (P1 to P4) 11 to 14, respectively. .

That is, the processors (P1 to P4) 11
~14 contains the file catalog director table (DT
BL) T1 to T4 are respectively provided, and file resource names to be managed are registered in the file catalog director tables (DTBL) T1 to T4.

[0017] The processors (P1 to P4) 11 to 14 are
Own device's file catalog director table (DTB)
L) Exclusive use rights (access rights) to the file resources registered in T1 to T4.

The processor (P2) 12 functions as a master processor of this loosely coupled multiprocessor system, and manages the allocation of file resource usage rights in the entire system.

That is, the processor (P2) 12 stores the file catalog director table (DTBL) of its own device.
) T2 plus other processors (P1, P3, P4) 1
It also holds file catalog director tables (DTBLs) T1, T3, and T4 of numbers 1, 13, and 14, and manages the contents of these file catalog director tables.

The inter-processor communication device 15 communicates with the processor (
P1 to P4) performs communication between 11 to 14,
The inter-processor communication device 15 is composed of, for example, communication CPUs provided in the processors (P1 to P4) 11 to 14, respectively.

The mass storage controller 16 is a magnetic disk controller that performs read/write control of the shared disk subsystem 17, and is connected to a processor (P
1 to P4) File resources of the shared disk subsystem 17 are accessed according to instructions 11 to 14.

The shared disk subsystem 17 is shared by the processors (P1 to P4) 11 to 14, and is composed of a plurality of magnetic disk devices 17-1 to 17-n. This shared disk subsystem 17 includes
File resources that are referenced and updated under exclusive control by the processors (P1 to P4) 11 to 14 are stored.

In this loosely coupled multiprocessor system, each processor (P1 to P4) 11 to 14 can directly access file resources managed by its own device, but file resources not managed by its own device. The master processor (P2) 12 is inquired as to which processor is in charge of the information, and the master processor (P2) 12 is requested to access the managing processor.

[0024] Furthermore, if the file resource is not managed by its own device and no other processor is managing the file resource, the master processor (P2) 12 transfers the right to use the file resource to the requestor. Assign to processor.

FIG. 2 shows an example of a specific configuration of the file catalog director table (DTBL).

As shown in the figure, in the file catalog director table (DTBL), for each resource name of a file resource that the own device has usage rights, the managing processor name (own device name) and the file resource are assigned. The number of users inside is managed.

[0027] The number of users being assigned is determined by each processor (P
1 to P4) are managed every 11 to 14, and when an allocation request regarding the use of the corresponding file resource occurs, the value of the user count area of the requesting processor is increased by 1,
Furthermore, when a request for release of allocation related to the use of the file resource occurs, the value of the user count area of the processor that made the release request is decremented by 1.

Next, the distributed management operation of file resources in the loosely coupled multiprocessor system of FIG. 1 will be described with reference to FIGS. 3 to 7.

Access to file resources by each processor (P1 to P4) 11 to 14 is performed in the following steps: file assignment, file open, file get/put, file close, and file deassignment.
Here, allocation requests regarding the use of file resources (
(assignment) and a request to release allocation (deassignment) related to the use of file resources.

FIG. 3 shows the flow of assignment and deassignment processing in the entire loosely coupled multiprocessor system, and the flowchart in FIG.
Processors other than 12 (P1, P3, P4) 11, 13
, 14 are shown in detail.

Further, the flowchart in FIG. 5 shows the details of the processing in response to the inquiry in the master processor (P2) 12, and the flowchart in FIG.
3, P4) The details of the processing at the time of deassignment in 11, 13, and 14 are shown, and the flowchart of FIG. 7 shows the details of the resource release (deassignment) process in the master processor (P2).

For example, when an assignment request for a specific file resource occurs in the processor (P1) 11, as shown in FIG.
) 11, an assignment processing (step A1) routine is activated. In the assignment processing routine (step A1), it is determined whether or not the processor managing the file resource to which the assignment is requested is the own device (step A2).

If the managing processor is the own device, a file assignment process for directly assigning files is started (step A3), and if the managing processor is not the own device, an assignment request process to the managing processor is started. is activated (step A4).

That is, as shown in the flowchart of FIG. 4, the assignment processing routine (step A1)
First, the processor (P1) 11 searches the file catalog director table T1 to detect whether or not the file resource to be assigned exists in the file catalog director table T1 (step S1), and It is determined whether or not it has already been registered (step S2).

If the file resource to be assigned has already been registered in the file catalog director table T1, the right to use the file resource has been assigned to the own device, so the user count area ( Here, the value of the user count area corresponding to processor P1 is updated by +1 (step S3
), and then returns the name of the managing processor (in this case, processor P1) to the requesting user (step S7
).

On the other hand, if the file resource to be assigned is not registered in the file catalog director table T1, the right to use the file resource has not been assigned to its own device, so the processor (P1) 11 The master processor (P2) 12 is inquired about the name of the managing processor that has the right to use the resource (step S
4).

In this inquiry, the processor (
The name of the file resource to be assigned and the name of the requesting processor are sent from P1) 11 to the master processor (P2) 12, and the master processor (P2) 12 notifies the name of the processor that manages the file resource to be assigned. .

In this case, if the right to use the file resource requested to be assigned by the processor (P1) 11 is managed by another processor, for example, the processor (P3) 13, the processor (P3) is used as the name of the managing processor.
)13 will be notified. In addition, if the right to use the file resource requested to be assigned by the processor (P1) 11 is not managed by any other processor, the name of the requesting processor is used as the managing processor name, that is, the processor of the processor (P1) 11. The name will be notified.

Therefore, the processor (P1) 11 determines whether the name of the managing processor notified from the master processor (P2) 12 is the own device (step S5), and if it is not the own device, the processor (P1) 11 is notified. The name of the managing processor that was created is returned to the requesting user (step S7).

[0040] If the managing processor name notified from the master processor (P2) 12 is the own device, the processor (P1) 11 assumes that the right to use the requested file resource has been newly assigned. Therefore, the file resource name is stored in the catalog file director table T.
1, and "1" is set in the user count area of the requesting processor (in this case, processor 11) corresponding to the file resource name (step S6). After this, enter the managing processor name (here, processor P
1) is returned to the requesting user (step S7).

[0041] The requesting user is a program that requests assignment processing to the processor (P1) 11, and this program uses the processor (P1) as the managing processor name.
When the name of the processor (P1) 11 is received, the file assignment process for the processor (P1) 11 shown in FIG.
), and when another processor name (for example, the processor name of processor (P3) P13) is received as the managing processor name, the process for requesting assignment to the managing processor (step A4) shown in FIG. 3 is started. .

In FIG. 5, the master processor (P2) 12
The routine for responding to inquiries is shown.

First, the master processor (P2) 12
The processor (P1
) 11, all file catalog director tables T1 to T4 set in the master processor (P2) 12 are searched (step S11), and the inquired file resource name is searched. It is determined whether it has already been registered in the file catalog director tables T1 to T4 (step S12).

If registered, the requesting processor (in this case, processor 11) in the file catalog director table corresponding to the file resource name.
Update the value of the user count area by +1 (step S
13) After that, the name of the processor that manages the inquired file resource (for example, processor P13) is returned to the inquirer (in this case, processor 11).
Step S15).

On the other hand, if the inquired file resource name is not registered in the file catalog director tables T1 to T4, the usage right for the file resource name is granted to the requesting processor (in this case, processor P11).
), the master processor (P2) 12
newly registers the inquired file resource name in the file catalog director table T1 set in its own device, and stores it in the user count area of the requesting processor (in this case, processor P11) corresponding to the file resource name. "1" is set (step S14).

The master processor (P2) 12 then returns the processor name of the requesting processor to the inquiry source as the managing processor name (step S15).

On the other hand, the processor that has received the request for assignment processing, for example, the processor (P3) 13, as shown in FIG. ), file assignment is executed (step C2).

[0048] In the processing at the time of assignment in the processor that received this request, the processing of steps S1, S2, S3, and S7 in the flowchart of FIG. 4 is executed.

Next, referring to the flowchart of FIG.
The processing performed at the time of deassignment after file resource access is completed will be explained.

For example, when the processor (P1) 11 finishes accessing a specific file resource and a deassignment request for that file resource occurs, as shown in FIG.
First, it is determined whether the processor managing the file resource is the own device (step A5).

[0051] When the managing processor is the own device, the processor (P1) 11 that requests the de-assignment starts processing at the time of de-assignment (step A6), and directly executes the file de-assignment process. (Step A7). If the managing processor is not the own device, processing for requesting de-assignment to the managing processor is started (step A8).

That is, the processing routine at the time of deassignment (
In step A6), as shown in FIG. 6, the processor (P1) 11 first notifies the master processor (P2) 12 of resource release (step S21).

In processing this resource release notification, the processor (P1) 11 to the master processor (P2) 12
The name of the file resource to be deassigned and the name of the requesting processor are sent to .

[0054] Next, the processor (P1) 11 determines whether or not the file resource to be de-assigned is managed by its own device, and if it is not managed by its own device, it ends the process and manages the file resource by its own device. When there is, step S23 to S25
Shift to processing.

That is, the processor (P1) 11 stores the user count area (here, the user count area corresponding to the processor P1) corresponding to the processor that requested the deassignment in the file catalog director table T1 corresponding to the file resource to be deassigned. area) is updated by -1 (step S23).

[0056] Next, the processor (P1) 11 refers to the file catalog director table T1 and determines that the user count number of all processors for the file resource to be deassigned to which the processor has usage rights is "0".
(step S24), and if they are all "0", the processor being assigned does not exist, so the name of the file resource to be de-assigned is deleted from the entry in the file catalog director table T1 (step S25). ).

Next, referring to the flowchart of FIG.
The flow of processing in the resource release processing routine (step B2) executed by the master processor (P2) 12 will be explained.

First, the master processor (P2) 12
The processor (P
1) Search all file catalog director tables T1 to T4 set in the master processor (P2) 12 based on the file resource name sent from the master processor (P2) 12 (step S31), and search the file for which the resource release notification has been sent. Discover the processor that manages the resource.

Next, the value in the user count area of the requesting processor (in this case, processor P1) in the file catalog director table corresponding to the managing processor is updated by -1 (step S32).

[0060] Then, the master processor (P2) 12 determines whether or not the user count number of all processors is "0" for the file resource for which the resource release notification has been made (
Step S33), if all are "0", there is no processor being assigned, so the master processor (P
2) Delete the file resource name for which the resource release notification was given from the entry in the file catalog director table set in 12 (step S34).

As shown in FIG. 3, the processor (P3) 13 that has received the request for de-assignment processing performs the same processing at the time of assignment as in step A6 of the requesting processor (step C3), and The assignment is executed (step C4).

As described above, in this embodiment, each processor (P1 to P4) 11 to 14 has a file catalog director table T1 to T4, and the tables T1 to T4 contain files to which usage rights are assigned. The resource name of the resource is registered. Further, one determined master processor (P2) 12 manages the contents of the file catalog director tables T1 to T4 of all processors.

For this reason, each processor (P1 to P4) 1
1 to 14 recognize the presence or absence of usage rights by referring to the table of their own device, and if they have usage rights, they execute direct file access, and if they do not have usage rights, they go to master processor (P2) 12. Inquire about the name of the managing processor that has usage rights, request the managing processor to access the file, and receive the access results.

[0064] Therefore, the management of file resources can be distributed among the processors (P1 to P4) 11 to 14, and concentration of load on a specific processor can be avoided.
File access can be efficiently executed under exclusive control.

[0065]

As described above, according to the present invention, file resource management can be distributed among computers, and file access can be executed efficiently.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a system configuration according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a specific configuration of a file catalog director table in the embodiment.

FIG. 3 is a diagram conceptually showing the operational procedure of assignment processing and deassignment processing in the same embodiment.

FIG. 4 is a flowchart illustrating the operation of assignment processing in the same embodiment.

FIG. 5 is a flowchart illustrating the operation of response processing to an inquiry from the master processor in the same embodiment.

FIG. 6 is a flowchart illustrating the operation of deassignment processing in the same embodiment.

FIG. 7 is a flowchart illustrating the operation of resource release processing by the master processor in the same embodiment.

[Explanation of symbols]

11-14... Processor, T1-T4... File catalog director table, 16... Mass storage controller, 17... Shared disk subsystem.

Claims (1)

[Claims] Claim 1: In a composite computer system comprising a plurality of computers that share file resources, each computer has a resource management table that manages resource names of file resources to which usage rights are assigned to the computer itself. , a means for determining whether or not the management source of the file resource to be requested for use is the own device by referring to the resource management table; means for executing the access and inquiring the name of the managing computer from the master computer when the managing source of the file resource to be requested for use is not the own device; a means for requesting access to a file resource that is a target of a usage request, and the master computer in the plurality of computers manages a resource name of a file resource to which usage rights are assigned for each computer. a management table; means for checking the name of a computer that manages the file resource to be requested for use by referring to the resource management table; When the name of the computer that manages the file is not registered in the resource management table, the name of the computer that manages the file is notified to the computer that makes the inquiry. and means for allocating a file resource to a managing computer for a file resource requested for use.