JPH10294749A - Polling delay avoidance system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain sure polling at a preset polling interval as to a monitor object with high priority. SOLUTION: In a monitor system in which a polling execution means 101 on a monitor applies polling to a plurality of monitor objects, based on a monitor object set in advance to a polling interval storage area 104 and a polling interval for each monitor object by the user, a delay detection means 102 monitors a polling execution timing of the polling execution means 101 to discriminate whether or not a delay takes place in a polling execution timing, a monitor object delete means 103 seeks a monitor object with the lowest priority set to each monitor object in a priority storage area 106 among monitor objects set to a polling interval storage area 104 and deletes it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polling control method in network / system management, and more particularly, to executing polling on a monitoring device based on a monitoring target set in a polling interval storage area by a user in advance and a polling interval for each monitoring target. The present invention relates to a polling delay avoidance method in a monitoring system in which means polls a plurality of monitoring targets.

[0002]

2. Description of the Related Art In general, in network / system management, polling is performed by a monitoring apparatus to periodically acquire monitoring data from a plurality of monitoring targets, but which of a large number of hosts constituting a network is monitored. The user determines the interval at which the polling is to be performed and sets the monitoring device.

[0003] The total amount of polling performed by the monitoring device varies depending on the number of monitoring targets and the polling interval, but the user does not always set the number of monitoring targets and the polling interval that can be processed by the polling processing capability of the monitoring device. Absent.

As a related art related to polling, there is JP-A-8-51446. This technology controls the retransmission interval and the number of retransmissions of a polling signal from a terminal to a control station according to the priority of the terminal in a communication system in which communication is performed between a plurality of terminals and a control station by a polling method. In this way, even when communication traffic is congested, access to a communication channel of a terminal having a higher priority is preferentially established.

Further, there is Japanese Patent Application Laid-Open No. 8-46633. This technique is a method of detecting whether there is a data collision at the time of a communication request, and delaying communication access according to the importance of the communication request when the data collision is detected.

[0006]

When polling a plurality of monitoring targets from one monitoring device as in network / system management, the user sets a large number of monitoring targets without considering the polling processing capability of the monitoring device. If this happens, the monitoring device cannot process polling of all monitoring targets at the set polling interval, and there is a problem that the polling execution timing of all monitoring targets continues to be delayed (see FIG. 10). .

[0007] In the prior art, there is a technique in which the polling interval and the number of polling are variable according to the priority of the monitoring target.
A high priority monitoring target is not suitable when it is necessary to reliably poll at a preset polling interval.

[0008] An object of the present invention is to detect a delay in the polling execution timing and delete the monitoring target according to the priority of the monitoring target, so that a monitoring target with a high priority is surely set at a preset polling interval. An object of the present invention is to provide a polling delay avoidance method that enables polling.

[0009]

According to the present invention, there is provided a polling delay avoidance method comprising a plurality of polling executing means on a monitoring device based on a monitoring target set in a polling interval storage area by a user in advance and a polling interval for each monitoring target. In a monitoring system for polling a monitoring target, a polling execution timing of the polling execution means is monitored, and delay detection means for judging whether or not a delay has occurred in the polling execution timing is set in the polling interval storage area. A monitoring target deletion unit that searches for and deletes a monitoring target with the lowest priority set for each monitoring target in the priority storage area among the monitoring targets.

The machine-readable recording medium of the present invention is a computer-readable recording medium that performs polling for a plurality of monitoring targets, monitors the polling execution timing of the polling execution means, and causes a delay in the polling execution timing. Delay detecting means for determining whether or not the monitoring target is set, and among the monitoring targets set in the polling interval storage area, a monitoring target having the lowest priority set for each monitoring target in the priority storage area is searched for and deleted. A program for functioning as a monitoring target deletion unit is recorded.

[0011]

Next, an embodiment of the present invention will be described in detail.

FIG. 2 is a block diagram showing a configuration of a monitoring system to which a polling delay avoidance method according to one embodiment of the present invention is applied. This monitoring system includes a monitoring device 10 connected by a network capable of communicating with each other.
And a plurality of monitoring targets 20a to 20d. The monitoring targets 20a to 20d internally store the status of the monitoring targets themselves as monitoring data, and have a function of returning the monitoring data in response to polling from the monitoring device 10. Here, the identifiers of the monitoring targets 20a to 20d are A to D, respectively. In this embodiment, the number of monitoring targets is four, but this may be N (positive integer).

Referring to FIG. 1, a main part of a monitoring device 10 is composed of a data processing device 1 and a storage device 2.

The data processing apparatus 1 includes a polling execution unit 101, a delay detection unit 102, and a monitoring target deletion unit 103.

On the storage device 2, a polling interval storage area 104, a previous polling time storage area 105, and a priority storage area 106 are allocated.

As shown in FIG. 4, the polling interval storage area 104 stores identifiers of the respective monitoring targets 20a to 20d and polling intervals corresponding to the respective monitoring targets 20a to 20d. These are set in advance by the user,
In the present invention, when a delay is detected in the polling execution timing, these are automatically changed.

As shown in FIG. 5, the previous polling time storage area 105 stores previous sampling times corresponding to the identifiers of the respective monitoring targets 20a to 20d.

As shown in FIG. 6, the priority storage area 106 sets priorities corresponding to the identifiers of the respective monitoring targets 20a to 20d. Generally, each monitoring target is also a part of the business system, and the necessity of polling differs depending on the degree of influence on the business system. For example, when the monitoring target is operated as a server machine in a business system, the change in the status of the server machine has a large effect on the entire business system. is necessary.
On the other hand, there are some machines, such as client machines, which have a small influence on the business system and do not necessarily require the status monitoring by polling. The user defines this as a priority in the priority storage area 106 in advance.

The polling execution means 101 includes monitoring targets 20a to 20a stored in the polling interval storage area 104.
The polling is performed at a polling interval set for each of the 20d. Generally, polling execution means 1
As shown in FIG. 3, the scheduler 1011 schedules the execution of polling based on the setting of the polling interval storage area 104, and the monitoring targets 20a to 20a.
It comprises a schedule storage unit 1013 for storing the next polling scheduled time of 20d, and a polling execution unit 1012 for actually transmitting packets for monitoring data acquisition to the monitoring targets 20a to 20d and receiving the results.

Referring to FIG. 7, polling executing means 1
01 is a counter i initial setting step S101
And next polling scheduled time / current time comparison step S
102, a polling execution step S103, a next polling scheduled time calculation / storage step S104, a counter i increment step S105, and a counter i
It comprises a monitoring target number excess determination step S106.

The delay detecting means 102 monitors the execution of polling performed by the polling executing means 101 and determines whether or not a delay has occurred in the execution of polling.

Referring to FIG. 8, the processing of the delay detecting means 102 includes a previous polling time extracting step S201.
, A polling interval extraction step S202, a scheduled polling time calculation step S203, a scheduled polling time> current time comparison step S204, and a monitoring target deletion unit calling step S205.

The monitoring target deletion unit 103 deletes the monitoring target with the lowest priority from the monitoring targets stored in the polling interval storage area 104 based on the priority defined in the priority storage area 106.

Referring to FIG. 9, the monitoring target deleting means 10
The processing of No. 3 is the lowest priority monitoring target specifying step S301
And a corresponding monitoring target deletion step S302.

Next, the operation of the thus configured polling delay avoidance system according to the present embodiment will be described.

First, in the first polling of each monitoring target, the polling execution means 101 determines that all of the monitoring targets 20 a to 20 a set in the polling interval storage area 104 are to be monitored.
Polling is sequentially performed on 20d. Here, at the end of the execution of each poll, the next polling scheduled time is determined. In the second and subsequent polling, the next polling scheduled time is checked, a monitoring target that has reached the next polling scheduled time is searched, and polling is performed on the monitoring target. If there is no monitoring target that has reached the scheduled polling time next time, wait until it reaches. Polling execution means 10
1 basically repeats the above operation.

More specifically, the polling execution means 101
The counter i is initialized to 1 (step S101), and the scheduler 1011 causes the schedule storage unit 1013
The next polling scheduled time and the current time of the i-th monitoring target stored in the storage device are compared with each other (step S102). The polling is executed for the i-th monitoring target (step S103), the next polling scheduled time is calculated, and the scheduler 1011 calculates the scheduled polling time.
3 (step S104). Thereafter, the polling executing means 101 increments the counter i by one (step S105), and determines that the counter i
It is determined whether or not (in this example, 4) has been exceeded (step S106), and if not, the control is returned to step S102, and the next monitoring target is subjected to steps S102 to S102.
S106 is repeated. If the counter i exceeds the number N to be monitored, the polling execution means 101 proceeds to step S10.
1 to return to step S10 from the top monitoring target.
Steps 1 to S106 are repeated.

The delay detecting means 102 monitors the execution of polling by the polling executing means 101, and when detecting the execution of polling on the monitoring target, retrieves the previous polling time of the monitoring target from the previous polling time storage area 105. (Step S201),
The polling interval of the monitored object is retrieved from the polling interval storage area 104 (step S202). Next, the delay detecting means 102 calculates the scheduled polling time given by the sum of the previous polling time and the polling interval (step S204), and determines whether or not the scheduled polling time has passed the current time (step S204). S20
4) If it has passed, it is determined that a delay has occurred in the polling execution timing, and the monitoring target deletion unit 1
03 is requested to delete the monitoring target (step S20).
5). If no delay has occurred in the polling execution timing, the delay detection unit 102 determines in step S205
Skip and do nothing. When comparing and determining the delay, an allowable range of the delay may be provided, and the delay within the allowable range may be ignored.

When the monitoring target deletion unit 103 receives a monitoring target deletion request from the delay detection unit 102, the monitoring target deletion unit 103 determines the monitoring target existing in the polling interval storage area 104 based on the priority defined in the priority storage area 106. The monitoring target having the lower priority is specified (step S301), and the monitoring target entry is deleted from the polling interval storage area 104. After the monitoring target is deleted, the monitoring target deletion unit 1
In step 03, the polling execution means 101 is reset to the initial state, and the polling is executed from the initial state.

The following is a specific example.

FIG. 10 is a timing chart showing the monitoring targets when a delay occurs, the polling interval of each monitoring target, the priority of the monitoring targets, and the timing at which the monitoring device 10 performs polling. In this example, in order to poll four monitoring targets A, B, C, and D (hereinafter, monitoring targets are denoted by reference numerals with an identifier) at a specified polling interval, it is necessary to perform polling per unit time. Four polls need to be processed. However, since the polling processing capability of the monitoring device 10 can execute only two polls per unit time, a delay occurs every 1/2 hour as shown in FIG.

On the other hand, FIG. 11 is a timing chart showing the polling after the low priority monitoring target D is deleted in the above example. By deleting the low-priority monitoring targets D in this way, the high-priority monitoring targets A, B, and C are deleted.
Polling can be performed without causing a delay without changing the polling interval.

In this example, for simplicity, the polling intervals for all the monitoring targets A, B, C, and D are set to be the same, but they may be set at different intervals.

Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 12, a polling delay avoidance system according to a second embodiment of the present invention comprises a data processing apparatus 1 comprising a polling execution unit 101 and a delay detection unit 10.
2 and a recording medium 3 that records a program that functions as the monitoring target deletion unit 103 (hereinafter, referred to as a polling control program). This recording medium 3 may be a magnetic disk, a semiconductor memory, or another recording medium.

The polling control program is stored in the recording medium 3
Is read into the data processing device 1 from the
Control the operation of. Note that the operation of the data processing device 1 by the polling control program is exactly the same as the operation of the polling delay avoidance method according to the first embodiment, and a detailed description thereof will be omitted.

[0037]

As described above, according to the polling delay avoidance method of the present invention, in a monitoring system for performing polling from a single monitoring device to a plurality of monitoring targets as in network / system management, a user can monitor the monitoring device. Even if a large number of monitoring targets are set without considering the polling processing capability of the server, by deleting the low priority monitoring targets, polling of the high priority monitoring targets can be performed without changing the polling interval. There is an effect that execution can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a polling delay avoidance method according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a monitoring system to which a polling delay avoidance method according to the present embodiment is applied.

FIG. 3 is a block diagram showing a more detailed configuration of a polling execution unit in FIG. 1;

FIG. 4 is a diagram showing the contents of a polling interval storage area in FIG. 1;

FIG. 5 is a diagram showing contents of a previous polling time storage area in FIG. 1;

FIG. 6 is a diagram showing contents of a priority storage area in FIG. 1;

FIG. 7 is a flowchart showing a process of a polling execution unit in FIG. 1;

FIG. 8 is a flowchart showing a process of a delay detecting means in FIG. 1;

FIG. 9 is a flowchart showing processing of a delay target deletion unit in FIG. 1;

FIG. 10 is a timing chart illustrating a case where a delay has occurred.

FIG. 11 is a timing chart showing a state in which a delay is avoided by the polling delay avoidance method according to the present embodiment.

FIG. 12 is a block diagram showing a configuration of a polling delay avoidance method according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 data processing device 2 storage device 3 recording medium 10 monitoring device 20a to 20d monitoring target 101 polling execution unit 102 delay detection unit 103 monitoring target deletion unit 104 polling interval storage area 105 last polling time storage area 106 priority storage area 1011 scheduler 1012 Polling execution unit 1013 Schedule storage unit

Claims (2)

[Claims] 1. A monitoring system in which polling execution means on a monitoring device polls a plurality of monitoring targets based on a monitoring target set in a polling interval storage area in advance by a user and a polling interval for each monitoring target. Delay detection means for monitoring the polling execution timing of the execution means and determining whether or not a delay has occurred in the polling execution timing; and among the monitoring targets set in the polling interval storage area, the priority storage area A polling delay avoidance method comprising: a monitoring target deletion unit that searches for and deletes the monitoring target with the lowest priority set for each monitoring target. 2. A polling execution means for polling a plurality of objects to be monitored by a computer, a delay detection means for monitoring the polling execution timing of the polling execution means and judging whether or not a delay has occurred in the polling execution timing. And a program for functioning as monitoring target deletion means for searching for and deleting the monitoring target with the lowest priority set for each monitoring target in the priority storage region from among the monitoring targets set in the polling interval storage region. A machine-readable recording medium on which is recorded.