System and method for sharing data polling and buffering for multiple requesters

• US 20060085536A1
• Filed: 09/30/2004
• Published: 04/20/2006
• Est. Priority Date: 09/30/2004
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: West, Dean Merritt II, Parvin, William Augustus, Meyer, Joel Peter, Qiao, Wenjian
• Application Number:
  US10/954,457
• Publication Number:
  US 20060085536A1
• Time in Patent Office: Days
• US Class Current: 709/224
• CPC Class Codes: G06F 11/3495 for systems

Abstract

A system and method for sharing data polling and buffering for multiple requesters are provided. With the present invention, a user/computing device may register with a data polling system whose purpose is to periodically poll computer system resources for data. This data is stored in a common storage buffer with pointers to the data being stored in index data structures for a plurality of users. More than one user index data structure may have a pointer to the same data location in the common storage buffer. In addition, a mechanism for aligning data pollings among a plurality of users/computing devices is provided so as to increase the amount of sharing of data stored in the common storage buffer.

Claims

1. A method, in a data processing system, of polling at least one data source for data to be shared with a plurality of requesting computing devices, comprising:

receiving, from a requesting computing device, a refresh rate for polling data sources;

aligning polling time points of the data sources for the requesting computing device with at least one other requesting computing device based on the refresh rate;

retrieving data from the at least one data source in accordance with the polling time points of the data sources; and

storing the data from the at least one data source in a storage location within a common data storage for the plurality of requesting computing devices.

2. The method of claim 1, further comprising:

generating an index data structure for the requesting computing device;

storing a pointer to the storage location in the index data structure for the requesting computing device; and

storing a pointer to the storage location in an index data structure for at least one other requesting computing device in the plurality of requesting computing devices.

3. The method of claim 1, wherein the data processing system performs the method in association with a performance monitoring tool, and wherein the data from the at least one data source is performance data for the data source.

4. The method of claim 1, wherein the refresh rate for polling data sources is a multiple of a predetermined minimum unit of refresh interval established by the data processing system.

5. The method of claim 2, further comprising:

initiating a counter in association with the index data structure, wherein an initial value of the counter is set to a value corresponding to the refresh rate for polling data sources.

6. The method of claim 5, further comprising:

periodically checking counter values for each of the plurality of requesting computing devices; and

decrementing a value of the counter associated with the index data structure in response to a check of the counter value, wherein retrieving data from the at least one data source and storing the data in a storage location within a common data storage for the plurality of requesting computing devices are performed in response to the value of the counter becoming a predetermined value.

7. The method of claim 5, further comprising:

setting the counter to a second value based on a function of the refresh rate and a counter value of the at least one other requesting computing device.

8. The method of claim 7, wherein the function is:

C₁=C₂ mod R₁

where C₁ is the second value for the counter of the requesting computing device, R₁ is the refresh rate for polling data sources, and C₂ is the counter value for the other requesting device.

9. The method of claim 5, wherein the second value of the counter is set equal to the refresh rate of the requesting computing device if a value for the counter is currently equal to zero.

10. A computer program product in a computer readable medium for polling at least one data source for data to be shared with a plurality of requesting computing devices, comprising:

first instructions for receiving, from a requesting computing device, a refresh rate for polling data sources;

second instructions for aligning polling time points of the data sources for the requesting computing device with at least one other requesting computing device based on the refresh rate;

third instructions for retrieving data from the at least one data source in accordance with the polling time points of the data sources; and

fourth instructions for storing the data from the at least one data source in a storage location within a common data storage for the plurality of requesting computing devices.

11. The computer program product of claim 10, further comprising:

fifth instructions for generating an index data structure for the requesting computing device;

sixth instructions for storing a pointer to the storage location in the index data structure for the requesting computing device; and

seventh instructions for storing a pointer to the storage location in an index data structure for at least one other requesting computing device in the plurality of requesting computing devices.

12. The computer program product of claim 10, wherein the data processing system executes the first, second, third and fourth instructions in association with a performance monitoring tool, and wherein the data from the at least one data source is performance data for the data source.

13. The computer program product of claim 10, wherein the refresh rate for polling data sources is a multiple of a predetermined minimum unit of refresh interval established by the data processing system.

14. The computer program product of claim 11, further comprising:

eighth instructions for initiating a counter in association with the index data structure, wherein an initial value of the counter is set to a value corresponding to the refresh rate for polling data sources.

15. The computer program product of claim 14, further comprising:

ninth instructions for periodically checking counter values for each of the plurality of requesting computing devices; and

tenth instructions for decrementing a value of the counter associated with the index data structure in response to a check of the counter value, wherein the third instructions for retrieving data from the at least one data source and fourth instructions for storing the data in a storage location within a common data storage for the plurality of requesting computing devices are executed in response to the value of the counter becoming a predetermined value.

16. The computer program product of claim 14, further comprising:

eleventh instructions for setting the counter to a second value based on a function of the refresh rate and a counter value of the at least one other requesting computing device.

17. The computer program product of claim 16, wherein the function is:

C₁=C₂ mod R₁

where C₁ is the second value for the counter of the requesting computing device, R₁ is the refresh rate for polling data sources, and C₂ is the counter value for the other requesting device.

18. The computer program product of claim 14, wherein the second value of the counter is set equal to the refresh rate of the requesting computing device if a value for the counter is currently equal to zero.

19. An apparatus for polling at least one data source for data to be shared with a plurality of requesting computing devices, comprising:

a processor;

a common data storage coupled to the processor; and

a network interface coupled to the processor, wherein the processor receives, from a requesting computing device via the network interface, a refresh rate for polling data sources, aligns polling time points of the data sources for the requesting computing device with at least one other requesting computing device based on the refresh rate, retrieves, via the network interface, data from the at least one data source in accordance with the polling time points of the data sources, and stores the data from the at least one data source in a storage location within the common data storage for the plurality of requesting computing devices.

20. The apparatus of claim 19, further comprising a memory coupled to the processor, wherein the processor generates an index data structure for the requesting computing device in the memory, stores a pointer to the storage location in the index data structure for the requesting computing device, and stores a pointer to the storage location in an index data structure in the memory for at least one other requesting computing device in the plurality of requesting computing devices.