Thread level application partitioning

• US 7,363,626 B2
• Filed: 03/24/2003
• Issued: 04/22/2008
• Est. Priority Date: 03/24/2003
• Status: Active Grant

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Koutharapu, Balaji, Ramprasad, Srinivas M.
• Primary Examiner(s): An; Meng-Al T.
• Assistant Examiner(s): To; Jennifer N.
• Application Number:
  US10/395,570
• Publication Number:
  US 20040194093A1
• Time in Patent Office: 1,856 Days
• Field of Search: 718100-108, 709/235, 709223-226
• US Class Current: 718/105
• CPC Class Codes: G06F 2209/5011 Pool
• CPC Class Codes: G06F 2209/5018 Thread allocation
• CPC Class Codes: G06F 9/505 considering the load

Abstract

A system and method for managing threads and thread requests in an application server. If the application is a thread-partitioned application with a request, the thread manager may determine if an application thread array for the application has less than the maximum number of threads partitioned for the application. If it does, the thread manager may retrieve a thread from the main thread pool, and assign it to the request. If it does not, the thread manager may determine if there are any free threads in an application thread array, and if there are, one of the free threads in the application thread array may be assigned to the request. If there are no free threads available in the application thread array, the request may be added to a ready queue.

Claims

1. A system, comprising:

one or more processors; and

memory coupled to the one or more processors and configured to store program instructions executable by the processor to implement;

an application server configured to;

receive a request from an application for a thread for use by the application;

in response to the request, check a main thread pool for a free thread; and

assign, as part of a thread partitioning protocol, the free thread from the main thread pool to the request from an application if a number of threads in an application thread array is less than an application thread partition value for the application;

wherein the application server is operable to disable the thread partitioning protocol, wherein if the thread partitioning protocol is disabled, the threads in the main thread pool are used on a first-come, first served basis, wherein if the thread partitioning protocol is enabled, the thread is assigned according to the thread partitioning protocol.

2. The system as recited in claim 1, wherein the application server is further configured to:

check for a free thread in the application thread array if the number of threads in the application thread array is not less than the application thread partition value for the application; and

assign the free thread from the application thread array to the request, if the free thread is found in the application thread array.

3. The system as recited in claim 2, wherein if the number of threads in the application thread array is not less than the application thread partition value for the application and there are no free threads in the application thread array, the application server is further configured to put the request in a ready queue.

4. The system as recited in claim 3, wherein the application server is further configured to assign the request in the ready queue to a free thread from the application thread array when a busy thread in the application thread array becomes free.

5. The system as recited in claim 2, wherein the application server is further configured to store a thread identification for each thread assigned to the application in the application thread array.

6. The system as recited in claim 5, wherein the application server is further configured to designate the thread identification as busy or free.

7. The system as recited in claim 1, wherein the application server is further configured to access the application thread partition value for the application from a configuration file.

8. The system as recited in claim 1, wherein the application server is further configured to store a new thread identification in the application thread array for a new thread from the main thread pool assigned to the request if the thread identification is not stored in the application thread array and number of threads in the application thread array is less than the application thread partition value.

9. The system as recited in claim 1, wherein the application server is further configured to access information about the application in a lightweight directory access protocol file.

10. The system as recited in claim 9, wherein the information includes the application thread partition value assigned to the application.

11. The system as recited in claim 9, wherein the information further includes whether an application is a thread partitioned application.

12. A method, comprising:

receiving a request from an application for a thread for use by the application;

in response to the reguest, checking a main thread pool for a free thread;

determining if an application thread array has less threads than an application thread partition value for the application;

if a number of threads assigned to the application is less than the application thread partition value for the application, assigning the free thread from the main thread pool to the request;

wherein assigninig the free thread to the request is part of a thread partitioning protocol performed when the thread partitioning protocol enabled; and

when the thread partitioning is not enabled, assigning threads from the main thread pool on a first-come, first-serve basis.

13. The method as recited in claim 12, further comprising:

if the number of threads assigned to the application is not less than the application thread partition value for the application;

checking the application thread array for a free thread; and

if the application thread array has the free thread, assigning the free thread to the request.

14. The method as recited in claim 13, further comprising if there are no free threads in the application thread array, putting the request in a ready queue.

15. The method as recited in claim 13, further comprising if the free thread from the application thread array is assigned to the request, identifying the free thread as busy in the application thread array.

16. The method as recited in claim 13, wherein determining if the number of threads assigned to the application is not less than the application thread partition value for the application includes determining a number of thread identifications stored in the application thread array.

17. The method as recited in claim 13, further comprising determining if the request is from an application that is not thread partitioned.

18. The method as recited in claim 12, wherein if the free thread from the main thread pool is assigned to the request, storing a thread identification of the free thread in the application thread array for the application.

19. The method as recited in claim 12, further comprising maintaining information about the application in a lightweight directory access protocol.

20. The method as recited in claim 19, wherein the information includes the application thread partition value assigned to the application.

21. A computer accessible storage medium, comprising program instructions, wherein the program instructions are computer-executable to:

receive a request from an application for a thread for use by the application;

determine if an application thread array has less threads than an application thread partition value for the application;

if a number of threads assigned to the application is less than the application thread partition value for the application, assign a thread from a main thread pool to the request;

if the number of threads assigned to the application is not less than the application thread partition value for the application;

check the application thread array for a free thread; and

if the application thread array has the free thread, assign the free thread to the request;

wherein the program instructions for determining if the application thread array has less threads than the application thread partition value for the application and assigning a thread from a main thread pool to the request is part of a thread partitioning protocol, wherein the program instructions are further executable to perform the thread partitioning protocol if the thread partitioning protocol is enabled, wherein if the thread partitioning protocol is disabled, the program instructions are executable to assign threads from the main thread pool on a first-come, first-serve basis.

22. The computer accessible storage medium as recited in claim 21, wherein the program instructions are further executable to put the request in a ready queue if there are no free threads in the application thread array.

23. The computer accessible storage medium as recited in claim 21, wherein die program instructions are further executable to identify the free thread as busy in the application thread array if the free thread from the application thread array is assigned to the request.

24. The computer accessible storage medium as recited in claim 23, wherein the program instructions are further executable to store a thread identification of the free thread in the application thread array for the application if the free thread from the main thread pool is assigned to the request.

25. The computer accessible storage medium as recited in claim 21, wherein the program instructions are further executable to determine a number of thread identifications stored in the application thread array to determine if the number of threads assigned to the application is not less than the application thread partition value for the application.

26. The computer accessible storage medium as recited in claim 21, wherein the program instructions are further executable to maintain information about the application in a lightweight directory access protocol.

27. The computer accessible storage medium as recited in claim 26, wherein the information includes the application thread partition value assigned to the application.

28. The computer accessible storage medium as recited in claim 23, wherein the program instructions are further executable to determine if the request is from an application that is not thread partitioned.