JP3088412B2 - Polling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a computer system in which a program having a polling function (such as an application program for performing a polling process) polls a large number of polling targets (such as devices and programs on a network). The present invention relates to a polling method for realizing an algorithm for optimizing timing.

[0002]

2. Description of the Related Art Conventionally, in a computer system in which a program having a polling function polls a large number of polling targets, the program (polling processing program) performs polling of each polling target in the order of polling start time. (Polling in consideration of a polling interval and a response time is not performed as in the present invention described later).

As shown in FIG. 14, a conventional polling method uses a polling target data reading procedure (step) 2.
01, initial sorting procedure 2 for polling target data list
02, polling procedure 203, and information acquisition procedure 204
And a next polling start time calculating procedure 205 and a polling target data list sorting procedure 206.

The operation of the conventional polling method will be described below in detail with reference to FIG.

First, polling target data reading procedure 2
At 01, polling target data (data indicating how to perform polling for each polling target) is read from the database. Indispensable elements of each polling target data include a polling interval, a polling start time, and polling target information (each of the polling target data including such essential elements is called a polling target data entry).

[0006] The polling processing program holds each polling target data entry in a list (queue list) format as internal information (a list storing such information is called a polling target data list).

In the polling target data list initial sorting procedure 202, the respective polling target data entries in the polling target data list are sorted in ascending order of the polling start time.

In the polling procedure 203, the polling target data entry that has reached the polling start time or has passed the polling start time (expressed as “polling target data entry that has reached / elapsed the polling start time” in a sense including both). Polling is performed. The polled data entry that has been polled is removed from the polled data list.

In the information acquisition procedure 204, a response from the polling target to the polling performed in the procedure 203 is received.

In the next polling start time calculation procedure 205, the value obtained by adding the polling interval of the polling target data entry related to the polling to the time when the polling result (response from the polling target to the polling) is obtained is calculated. It is calculated as the next polling start time of the data entry.

[0011] Polling target data list sorting procedure 2
In step 06, the polling target data entry in which the polling start time calculated in step 205 is set as the polling start time (the polling target data entry removed from the polling target data list in step 203)
Is connected to the polling target data list. Then, similarly to the procedure 202, the respective polling target data entries of the polling target data list are sorted in ascending order of the polling start time, and the control is returned to the step 203.

Thereafter, the processing of steps 203 to 206 is repeated.

[0013]

As described above, in the conventional polling method, usually, a program having a polling function (polling processing program) uses an arbitrary protocol, and sets a polling target at a certain polling interval. Is polled, and information from each polling target is obtained. Further, in the related art, when performing polling, a limit (upper limit) based on a maximum number such as a maximum polling number or a maximum response waiting state is not normally set.

In the prior art, when there are many polling targets, if the polling timing of each polling target is concentrated at a specific time, the following problems may occur.

The first problem is that since no upper limit is set, polling exceeding the processing speed of the network is performed, packets may be dropped, and information from the polling target may not be correctly obtained. That is.

The second problem is that the polling process itself of the program having the polling function takes a long time by the CPU (C
This may monopolize the central processing unit or cause an out-of-memory condition.

The third problem is that a limited environment (C in a computer on which a polling processing program is executed)
When polling is performed in a PU or memory limitation environment), if there are many pollings with a long polling interval, it is difficult to perform a polling with a short polling interval according to the polling interval.

A fourth problem is that when polling is performed in a limited environment, if there are many polls having a long response time, it is difficult to perform polling having a short response time at a polling interval.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to limit the number of polling operations within a certain period of time (limitation based on the transmission speed of a line) and the number of polling response waiting states (usually immediately). An upper limit (maximum) is set by setting a limit to prevent a situation where there is no response due to a failure such as a line failure even in an environment where a response should be made, and to prevent unnecessary polling. By setting the priority based on the polling interval and / or the response time within the range of the number of polls and the maximum number of response wait states, optimization of polling timing (balancing of polling to each polling target) is achieved. Program that has a polling function can reduce the load on the system and network, and It is to provide a polling method that can avoid missed of.

That is, according to the polling method of the present invention, when a plurality of polls are performed at a plurality of polling intervals in an environment in which polling that can be performed within a fixed time is limited, a parameter for calculating a priority is set. Through the operation, the polling can be optimized.

[0021]

According to a polling method of the present invention, in a computer system in which a program having a polling function polls a plurality of polling targets, a polling target data is read from a database and a plurality of polling target data entries are read. A polling target data list for generating a polling target data list, a priority initial setting procedure for setting a priority value at the time of first reading, and a priority set for the polling target data list in the priority initial setting procedure. A polling target data list that is sorted in ascending order of the polling start time in consideration of the degree of polling, and a maximum polling number and a maximum response waiting state based on the polling target data list sorted in the polling data list initial sorting procedure. Polling is performed on the polling target data entry that has reached / elapsed the polling start time within the number range, the polling target data entry related to the polling is removed from the polling target data list, and polling cannot be performed because the maximum number range has been exceeded. For the polled data entry, a polling procedure for subtracting the priority value and setting the polling start time to the lowest value, and receiving a response from the polling subject to the polling performed in the polling procedure and recognizing a timeout are performed. The information acquisition procedure performed as “acquisition of polling result” and the priority of the polling target data entry for which the polling result was acquired in the information acquisition procedure are set based on the polling interval and the response time. The priority calculation procedure to be issued (instead of calculating the priority based on the polling interval and the response time, it is also possible to calculate the priority based on one of the polling interval and the response time) and A next polling start time calculating step of calculating, as the next polling start time, a value obtained by adding a polling interval to the polling result obtaining time for the polling target data entry for which the polling result has been obtained in the information obtaining step; Connect the polling target data entry in which the priority calculated in the calculation procedure and the polling start time calculated in the next polling start time calculation procedure are set to the polling data list,
A polling target data list sorting procedure for sorting the polling target data list in ascending order of polling start time in consideration of priority.

Further, the polling method according to the present invention comprises a computer system in which a program having a polling function performs polling for a plurality of polling targets by reading polling target data from a database and polling a plurality of polling data entries. A polling target data reading procedure for generating a data list, a priority initial setting procedure for setting a priority value at the time of first reading, and a polling of the polling target data list in consideration of the priority set in the priority initial setting procedure. The polling target data list initially sorted in ascending order of the start time, and the polling target data list sorted in the polling target data list initial sorting procedure is used to poll within the range of the maximum number of polls and the maximum number of response wait states. Polling is performed on the polling target data entry that has reached / elapsed the start time, the polling target data entry related to the polling is removed from the polling target data list, and the polling target data entry that could not be polled because it exceeded the maximum number range Is a polling procedure for subtracting the priority value and setting the polling start time to the lowest value, and receiving the response from the polling target and recognizing the timeout for the polling performed in the polling procedure as “acquiring the polling result”. An information acquisition procedure to be performed; a priority calculation procedure for calculating a priority based on a polling interval and a response time for a polling target data entry for which a polling result has been acquired in the information acquisition procedure; A next polling start time calculating step of calculating, as the next polling start time, a value obtained by adding a polling interval to the polling result obtaining time for the polling target data entry for which the polling result has been obtained in the information obtaining procedure; The polling target data entry in which the priority calculated in the calculation procedure and the polling start time calculated in the next polling start time calculation step are set is connected to the polling target data list, and the priority is added to the polling target data list. It can also be realized as a recording medium that records the program for functioning as a polling target data list sorting procedure that sorts in ascending polling start time.

[0023]

Next, the present invention will be described in detail with reference to the drawings.

(1) First Embodiment FIG. 1 is a flowchart showing a processing procedure of a polling method according to a first embodiment of the present invention.

Referring to FIG. 1, the polling method according to the present embodiment includes a polling target data reading procedure (step) 101, a priority initial setting procedure 102, a polling target data list initial sorting procedure 103, a polling procedure. 104, information acquisition procedure 105, priority calculation procedure 106, and next polling start time calculation procedure 10
7 and a polling target data list sorting procedure 108.

FIG. 2 is a diagram showing a specific example of a computer system to which the polling method according to the present embodiment is applied.

FIGS. 3 to 7 are diagrams for explaining specific operations of the polling method according to the present embodiment.

Next, the overall operation of the polling method thus configured according to the present embodiment will be described in detail.

The polling method according to the present embodiment provides an algorithm for optimizing the polling order in a program having a polling function (such as an application program for performing a polling process). Such a program (polling processing program) is applied to, for example, a computer system as shown in FIG.

As shown in FIG. 2, the computer system includes a computer (a control station having a CPU and a memory) 21 on which a polling processing program is executed.
, A network 22, and a plurality of polling targets 23.

The polling method according to the present embodiment operates as follows in such a computer system (see FIG. 1).

First, the variables used here will be described.
In the following a to g, each variable is described in a description format of “variable name: description”.

A. Priority (P): Priority when polling is performed for each polled data entry. The smaller the value, the higher the priority. b. Polling interval (I): Interval for performing polling set for each polled data entry. c. Response time (T): Time from when an information acquisition request is made in each polling until when there is actually a response. d. Interval operation priority calculation weight (α): A weight for performing an operation to increase the priority of a polling target data entry with a short polling interval and decrease the priority of the polling target data entry with a short polling interval. e. Response time operation priority calculation weight (β): Operation to increase the priority of polling target data entry related to polling with short response time and decrease the priority of polling of polling target data entry related to polling with long response time Weight to do. f. Maximum number of polls: The maximum number of polls that can be performed in a certain period of time. g. Maximum number of response wait states: The maximum number of response wait states for polling.

Next, the processing in each procedure in FIG. 1 will be sequentially described.

In the polling target data reading procedure 101, polling target data (data indicating how to perform polling for each polling target) is read from a database. The essential elements of each polling target data include a polling interval, a polling start time, and a polling target information.
Polling target data entry).

In a polling processing program (a program having a polling function; see FIG. 2), each polling target data entry is held in a list (queue list) format as internal information (such information is stored). The list is called “polling target data list”).

In the priority initial setting procedure 102, the value of the polling interval is set as the priority at the time of the first reading. It is generally considered to set the polling interval value as the priority at the time of the first reading, but it is not particularly limited in this way (other values are set as the initial values of the priority. Can also be set).

In the polling target data list initial sort procedure 103, each polling target data entry in the polling target data list is sorted in ascending order of the polling start time. At this time, for the portion where the polling start times are equal (polling target data entry group),
Sorted in ascending order of priority.

In the polling procedure 104, the polling target data entry that has reached the polling start time or the polling target data entry that has passed the polling start time (“polling target data entry that has reached / elapsed the polling start time” in a sense including both) Polling) is performed. At this time, polling is performed within the range of the maximum polling number and the maximum response waiting state number. If polling cannot be performed because the maximum number (the maximum number of polls or the maximum number of response wait states) is exceeded even though the polling start time has been reached, such polling is possible. For the polling target data entry that did not exist, its priority is subtracted by a certain numerical value (for example, 1), and the polling start time is the lowest value of the time reference value (a certain numerical value that is smaller than the current time. For example, 0. ). On the other hand, the polled data entry that has been polled is removed from the polled data list.

In the information acquisition procedure 105, a response to the polling performed in the procedure 104 is received. In addition, a process for recognizing polling that has reached a preset timeout period (recognition of timeout) is also performed (the timeout period is also regarded as a response time). Note that the term “acquisition of polling results” includes both the reception of such a response and the recognition of a timeout.
Is used.

In the priority calculating step 106, the priority is calculated by the following formula using the polling interval and the response time with respect to the polling target data entry related to the polling that obtained the polling result. Note that the calculation formula is merely an example, and another calculation formula may be used as long as the polling interval and the response time are taken into consideration. Further, each symbol is described in the above description of the variables (P: priority, T: response time, α: weight for calculating interval operation priority, β: weight for calculating response time operation priority, I: Polling interval).
Here, α and β are certain constant values.

P = (α + βT) I

In the next polling start time calculation step 107, a value obtained by adding the value (time) of the polling interval to the time at which the polling result was obtained is calculated as the next polling start time.

Polling target data list sorting procedure 1
In step 08, the values calculated in steps 106 and 107 are reset to the priority and polling start time of the polling target data entry removed in step 104, and the polling target data entry is linked to the polling data list. You. Then, Step 1
As in step 03, the polling target data list is sorted in ascending order of the polling start time, and control is returned to step 104. At this time, portions having the same polling start time are sorted in ascending priority order.

Thereafter, the processing of steps 104 to 108 is repeated.

In the calculation of the priority in the step 106, the priority can be calculated in consideration of only one of the polling interval and the response time. Also in this case, it is needless to say that a certain effect can be obtained and the invention can be realized.

Next, the operation of the polling method according to the present embodiment and the effect obtained by the operation will be verified based on a specific example with reference to FIGS.

These examples are based on the results obtained by performing a model calculation by a simulation using a computer, and illustrate the specific effects of the present embodiment.

That is, in the examples shown in FIGS. 3 to 7, the polling intervals are 5 seconds, 10 seconds, 15 seconds, 20 seconds,
And 200 polling targets of 25 seconds each (polling target 23 in FIG. 2) are prepared, and the polling processing result when the polling processing program polls 1000 polling targets in total for one hour (actual polling result). The “real interval”, which is the polling interval time (seconds). here,
The 200 polling targets in each polling interval are divided into ten groups of 20, each having a response time of 0 seconds, 1
Seconds, 2 seconds, 3 seconds, 4 seconds, 5 seconds, 6 seconds, 7 seconds, 8 seconds, and 9 seconds are set. The maximum number of polls that can be performed per second is set to 100, and the maximum number of polling response waits (maximum number of response wait states) is 100.
Is set to

Example 1 shown in FIG. 3 is the result of polling performed when polling is performed in the order of earliest polling start time (α = 0, β = 0) taking only the polling start time into account.

Example 2 shown in FIG. 4 is a result of polling performed when the polling interval is considered as a priority (α = 3, β = 0) in addition to the polling start time.

In Example 1, when the polling interval is 5 seconds, the actual polling is performed at about 7.8 times the actual interval, whereas when the polling interval is 25 seconds, the actual polling is about 2.4 times. Polling is performed at twice the real interval. On the other hand, in Example 2, when the polling interval is 5 seconds, actual polling is performed at about 4.4 times the actual interval, and when the polling interval is 25 seconds, polling is performed at about 4.1 times the actual interval. Has been carried out. From these results, it can be seen that the polling process in the case where the priority is calculated based on the polling interval has the effect of increasing the priority of the polling having a short polling interval and balancing the polling.

Example 3 shown in FIG. 5 shows the result of polling performed when α = 2 and β = 0.22, and Example 4 shown in FIG.
Is the polling result when α = 1, β = 0.44, and Example 5 shown in FIG. 7 is the polling result when α = 0, β = 0.67.

Based on the results of the polling performed in Examples 2, 3, 4, and 5, the polling process in which the response time is considered as a priority raises the priority for those with a short response time and raises the priority for those with a long response time. It can be understood that this effect can be made more remarkable by bringing about the effect of lowering the value and increasing β.

As described above, the polling method according to the present embodiment in which the polling interval and the response time are considered as priorities avoids the tendency that polling with a short interval is not performed on time due to polling with a long interval. At the same time, there is an effect of avoiding a tendency that polling having a short response time is not performed on time due to polling having a long response time.

(2) Second Embodiment Many network management application programs use SNMP (Simple Network Man).
Management Protocol (MIB) from the network device using the Management Protocol (MIB).
operationBase) information is periodically collected. Usually, the same LAN (Local Area Ne)
network) on one of the M
The time required to acquire the IB information is considered to be within one second. In addition, when the network management application program polls the network device by SNMP, a timeout time is usually set, and if no response is obtained within the timeout time, the network in which no response is obtained is set. Device SNM
The P-agent function is considered "not implemented or down".

By regarding the time required for acquiring the MIB information and the timeout time as the response time, the present invention is applied to such a network management application program (a computer system on which the network management application program is executed). Polling method can be applied.

That is, in the polling method according to the second embodiment of the present invention, a network management application program that periodically collects MIB information from a network device on a LAN using SNMP is used by a plurality of network devices. Is applied to a computer system that performs polling for obtaining MIB information.

FIG. 8 is a diagram showing a specific example of a computer system to which the polling method according to the present embodiment is applied.

In the computer system to which the polling method according to the present embodiment is applied, the polling processing program in FIG. 2 corresponds to the network management application program, and the computer 21
1, the network 22 corresponds to the LAN 82,
The polling target 23 is a network device 83 to be managed.
Corresponds to.

In the polling method according to this embodiment,
In the computer system as described above, each procedure shown in FIG. 1 is executed. The processing in each procedure is as follows:
Since the processing is exactly the same as the processing in the first embodiment described above, detailed description is omitted here.

FIGS. 9 to 12 are diagrams for explaining the specific operation of the polling method according to the present embodiment.

Here, referring to FIGS. 9 to 12,
Several model calculation examples (simulation examples using a computer) will be shown as specific examples to verify the effectiveness of the present invention.

In this specific example, model calculations are performed assuming the following states a to g.

A. The number of network devices to be managed (the network devices 83 in FIG. 8) is 1000, and polling is performed for one hour. b. Polling intervals are 5 seconds, 10 seconds, 15 seconds,
20 seconds and 25 seconds. c. The number of network devices to be polled at each polling interval is 200 each. d. The number of network devices from which MIB information can be acquired at each polling interval is 160 (80% of the total), and the number of network devices that do not respond (time out) is 40
Stand (20% of the whole). e. It takes one second to acquire information. f. The timeout period is 10 seconds. g. The maximum number of polls that can be performed per second is 10
It is assumed that the number is 0, and the maximum number of polling response waits (maximum number of response wait states) is 100.

Example 6 shown in FIG. 9 is the result of polling performed when α = 0 and β = 0, and Example 7 shown in FIG.
= 1.7, β = 0, and the result of polling performed when Example = 0 shown in FIG. 11 is α = 0.85, β = 0.30. FIG. 12 shows the result of polling performed when α = 0.85, β = 0.30. Example 9 shows the result of performing polling when α = 0 and β = 0.61.

As can be seen from Example 6, which is the result of polling in consideration of only the polling start time, the polling data entry having a short polling interval has a higher polling ratio (polling interval) than the polling data entry having a longer polling interval. Ratio to the actual interval) is low.

On the other hand, in Example 7, which is the result of performing polling in consideration of the priority based on the polling interval in addition to the polling start time, it can be seen that the polling is balanced.

Further, in Examples 8 and 9 which are results of polling in consideration of response time as a priority,
It can be seen that the polling target data entry from which information can be obtained (the polling target data entry for the polling target (management target network device) that does not time out) is polled at the actual interval close to the polling interval.

(3) Third Embodiment FIG. 13 is a block diagram showing a configuration of a polling method according to a third embodiment of the present invention.

Referring to FIG. 13, the polling method according to the third embodiment of the present invention is different from the polling method according to the first embodiment shown in FIG. The difference is that a recording medium 1000 that records (polling processing program) is provided. This recording medium 1000 may be a magnetic disk, a semiconductor memory, or another recording medium.

The polling processing program is executed on the recording medium 1
000 to a computer 21 (a computer connected to a plurality of polling targets 23 via the network 22), and the operation of the computer 21 is described as a polling target data reading procedure 101, a priority initial setting procedure 102, a polling target data list. Initial sort procedure 103, polling procedure 104, information acquisition procedure 105,
Control is performed as a priority calculation procedure 106, a next polling start time calculation procedure 107, and a polling target data list sorting procedure 108. The operation of the polling method realized by the polling processing program on the computer 21 is exactly the same as the operation of the polling method according to the first embodiment, and thus the detailed description is omitted.

Note that such a recording medium 1000 is
"A computer which performs a polling of a plurality of network devices for acquiring MIB information by a network management application program which periodically collects MIB information from network devices on a LAN using SNMP" It is needless to say that the present invention can be applied to a “system”.

[0074]

As described above, the present invention has the following effects.

The first effect is that the upper limit of the number of polls performed within a fixed time (maximum number of polls) and the upper limit of the number of states waiting for polling (maximum number of states waiting for response)
By setting the priority and setting the priority based on the polling interval within the upper limit, the polling for the polled data entry with a short polling interval can be performed for the polling for the polled data entry with a long polling interval. Is not likely to be performed on time.

The second effect is that, by setting the maximum number of polls and the maximum number of response wait states, and setting the priority in consideration of the response time within the upper limit, polling for a long response time is achieved. It is possible to avoid a tendency that polling having a short response time is not performed on time.

According to the method of setting the priority in consideration of the polling interval and also setting the priority in consideration of the response time, it goes without saying that both of the above effects can be achieved. .

As described above, according to the present invention, it is possible to optimize the polling timing (equalize the polling of each polling target), and reduce the load on the system or network by the program having the polling function itself. At the same time, there is an effect that information can be prevented from being missed.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a processing procedure of a polling method according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a computer system to which the polling method shown in FIG. 1 is applied.

FIG. 3 is a diagram for explaining a specific operation of the polling method shown in FIG. 1;

FIG. 4 is a diagram for explaining a specific operation of the polling method shown in FIG. 1;

FIG. 5 is a diagram for explaining a specific operation of the polling method shown in FIG. 1;

FIG. 6 is a diagram for explaining a specific operation of the polling method shown in FIG. 1;

FIG. 7 is a diagram for explaining a specific operation of the polling method shown in FIG. 1;

FIG. 8 is a block diagram illustrating an example of a computer system to which a polling method according to a second embodiment of the present invention is applied.

FIG. 9 is a diagram illustrating a specific operation of the polling method according to the second embodiment of the present invention.

FIG. 10 is a diagram for explaining a specific operation of the polling method according to the second embodiment of the present invention.

FIG. 11 is a diagram for explaining a specific operation of the polling method according to the second embodiment of the present invention.

FIG. 12 is a diagram for explaining a specific operation of the polling method according to the second embodiment of the present invention.

FIG. 13 is a block diagram showing a configuration for realizing a polling method according to a third embodiment of the present invention.

FIG. 14 is a flowchart showing a processing procedure of a conventional polling method.

[Explanation of symbols]

 21, 81 Computer 22 Network 23 Polling Target 82 LAN 83 Network Device 101 Polling Target Data Reading Procedure 102 Priority Initial Setting Procedure 103 Polling Target Data List Initial Sorting Procedure 104 Polling Procedure 105 Information Acquisition Procedure 106 Priority Calculation Procedure 107 Next Polling Start Time calculation procedure 108 Polling target data list sorting procedure 1000 Recording medium

Claims (8)

(57) [Claims] In a computer system in which a program having a polling function polls a plurality of polling targets, a polling target reads a polling target data from a database and generates a polling target data list including a plurality of polling target data entries. A data reading procedure, a priority initial setting procedure for setting a priority value at the time of initial reading, and a polling target data list in ascending order of the polling start time in consideration of the priority set in the priority initial setting procedure. The polling start time is reached / processed within the range of the maximum number of polls and the maximum number of response wait states based on the polling target data list initial sorting procedure to be sorted and the polling target data list sorted by the polling target data list initial sorting procedure. Polling is performed for the polled data entries that have passed, the polled data entries related to the polling are removed from the polled data list, and the priority value is set for the polled data entries that could not be polled because the maximum number was exceeded. A polling procedure for subtracting a value and setting a polling start time to a minimum value, and an information acquisition procedure for receiving a response from a polling target and recognizing a timeout with respect to the polling performed in the polling procedure as “acquiring a polling result” A priority calculating step of calculating a priority based on a polling interval and a response time for a polling target data entry for which a polling result has been obtained in the information obtaining step; and the information obtaining step. The polling target data entry for which the polling result was obtained in the next polling start time calculating step of calculating a value obtained by adding a polling interval to the polling result obtaining time as the next polling start time, and the priority calculating step The polling target data entry in which the calculated priority and the polling start time calculated in the next polling start time calculation step are set is connected to the polling target data list, and the polling start is performed in consideration of the priority of the polling target data list. A polling target data list sorting procedure for sorting in ascending time order. 2. The polling method according to claim 1, further comprising a priority calculation procedure for calculating the priority based on the polling interval instead of calculating the priority based on the polling interval and the response time. Method. 3. The polling method according to claim 1, further comprising a priority calculation procedure for calculating the priority based on the response time instead of calculating the priority based on the polling interval and the response time. Method. 4. A priority calculation procedure for calculating a priority by a calculation formula “(interval operation priority calculation weight + response time operation priority calculation weight × response time) × polling interval”. The polling method according to claim 1, wherein 5. A computer system in which a network management application program that periodically collects MIB information from network devices on a LAN using SNMP performs polling of a plurality of network devices for acquisition of MIB information. 2. The polling method according to claim 1, wherein the polling method is applied to: 6. A priority calculation procedure for calculating a priority by a formula of “(interval operation priority calculation weight + response time operation priority calculation weight × response time) × polling interval”. The polling method according to claim 5, wherein 7. A computer system in which a program having a polling function performs polling for a plurality of polling targets. A polling target for reading polling data from a database and generating a polling data list including a plurality of polling data entries. The data reading procedure, the priority initial setting procedure for setting the priority value at the time of the first reading, and the polling target data list are sorted in ascending order of the polling start time in consideration of the priority set in the priority initial setting procedure. Polling target data list initial sort procedure, based on the polling target data list sorted by the polling target data list initial sort procedure, polls that have reached / elapsed the polling start time within the range of the maximum number of polls and the maximum number of response wait states. Polling for the polling target data entry, remove the polling target data entry related to the polling from the polling target data list, and subtract the priority value for the polling target data entry that could not be polled because it exceeded the maximum number range And a polling procedure for setting the polling start time to the lowest value, an information acquisition procedure for receiving a response from a polling target for polling performed in the polling procedure and recognizing a timeout as “acquiring a polling result”, A priority calculation procedure for calculating a priority based on the polling interval and the response time for the polling target data entry for which the polling result has been obtained in the obtaining procedure;
A next polling start time calculating step of calculating, as the next polling start time, a value obtained by adding a polling interval to the polling result obtaining time for the polling target data entry for which the polling result has been obtained in the information obtaining step; The polling target data entry in which the priority calculated in the degree calculation procedure and the polling start time calculated in the next polling start time calculation step are set is connected to the polling target data list, and the priority is added to the polling target data list. A recording medium on which the program is recorded to function as a polling target data list sorting procedure that sorts data in ascending order of polling start time. 8. A computer system in which a network management application program that periodically collects MIB information from network devices on a LAN using SNMP polls a plurality of network devices for obtaining MIB information. To read the polling target data from the database and generate a polling target data list consisting of a plurality of polling target data entries, the priority setting procedure to set the priority value at the time of the first reading, the polling target A polling target data list initial sorting procedure for sorting the data list in ascending polling start time in consideration of the priority set in the priority initial setting procedure,
Based on the polling target data list sorted by the polling target data list initial sorting procedure, polling is performed on the polling target data entry that has reached / elapsed the polling start time within the range of the maximum polling number and the maximum response waiting state number. Remove the polling target data entry related to polling from the polling target data list, and subtract the priority value and set the polling start time to the lowest value for polling target data entries that could not be polled because they exceeded the maximum number range A polling procedure for performing the polling, an information acquisition procedure for receiving a response from the polling target to the polling performed in the polling procedure and recognizing a timeout as “acquiring a polling result”, and a polling procedure in the information acquisition procedure. Priority calculation procedure for calculating a priority based on a polling interval and a response time for a polling target data entry for which a polling result has been obtained, and a polling target data entry for which a polling result has been obtained in the information obtaining procedure , A next polling start time calculating procedure for calculating a value obtained by adding a polling interval to a polling result acquisition time as a next polling start time, and the priority calculated in the priority calculating procedure and the next polling start time calculating procedure The polling target data entry in which the polling start time calculated in Step 3 is set is connected to the polling target data list, and the polling target data list is sorted in ascending order of the polling start time in consideration of the priority. Recording medium recording the network management application program for functioning as a data list sorting procedure.