Method and apparatus for implementing concurrently running jobs on an extended virtual machine using different heaps managers

• US 6,971,097 B1
• Filed: 06/09/2000
• Issued: 11/29/2005
• Est. Priority Date: 06/09/2000
• Status: Expired due to Term

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Wallman, David
• Primary Examiner(s): An, Meng-Al T.
• Assistant Examiner(s): SHAH, NILESH R
• Application Number:
  US09/591,172
• Time in Patent Office: 1,999 Days
• Field of Search: 709/100, 709/101, 718100-102
• US Class Current: 718/101
• CPC Class Codes: G06F 2009/45566 Nested virtual machines
• CPC Class Codes: G06F 9/4493 Object persistence
• CPC Class Codes: G06F 9/45504 Abstract machines for programme code execution, e.g. Java virtual machine [JVM], interpreters, emulators
• CPC Class Codes: G06F 9/5016 the resource being the memory

Abstract

Methods and apparatus for implementing a virtual machine that supports the execution of more than one application per virtual machine process are described. According to one aspect of the present invention, a computing system includes a processor, a memory, and a virtual machine that is in communication with the processor. The virtual machine is arranged to enable one or more jobs to run on the virtual machine, and is further arranged to create a heap in the memory for each job that runs on the virtual machine. In one embodiment, the virtual machine includes a jobs manager, a class manager, and a heap manager. In such an embodiment, the heap manager manages substantially all heaps in the memory that are created by the virtual machine.

Claims

1. A computing system, the computing system including:

a processor;

a memory;

a virtual machine which is in communication with the processor, the virtual machine being arranged to enable two or more jobs, which are associated with two or more different applications, to run concurrently on the virtual machine, wherein the virtual machine is further arranged to create a heap in the memory for each one of the two or more jobs that concurrently run on the virtual machine;

wherein the virtual machine includes a jobs manager, a class manager, and a heap manager;

wherein the jobs manager generates first and second jobs data, first and second garbage collection instance data, and virtual machine instance data respectively associated with said two or more jobs that concurrently run on the virtual machine, and the jobs manager further associates one or more methods to each of the jobs data, garbage collection instance data, and virtual machine instance data; and

wherein the class manager is arranged to create proxy data which enables a class associated with the virtual machine to be shared by the two or more jobs that are arranged to concurrently run on the virtual machine.

2. A computing system according to claim 1 wherein the virtual machine is scaleable.

3. A computing system according to claim 1 wherein the heap manager manages substantially all heaps in the memory that are created by the virtual machine.

4. A computing system according to claim 3 wherein the heap manager is arranged to allow an object allocated on a first heap created by the virtual machine to be visible to a second heap created by the virtual machine.

5. A computing system according to claim 4 wherein the heap manager uses an object router to exchange data between the first heap and the second heap.

6. A computing system according to claim 1 wherein the virtual machine is further arranged to enable information to be exchanged between the one or more jobs that are arranged to run on the virtual machine.

7. A computing system according to claim 1 wherein the virtual machine is a Java compliant virtual machine.

8. A computing system according to claim 1 wherein the virtual machine is associated with a system heap, and the virtual machine is further arranged to create a system garbage collector, the system garbage collector being arranged to perform garbage collection on the system heap.

9. A computing system according to claim 8 wherein the virtual machine is further arranged to create an incremental garbage collector for each heap created in the memory, the incremental garbage collector for each heap being arranged to perform garbage collection on its associated heap.

10. A virtual machine arranged to operate in cooperation with a computing system, the virtual machine including:

a first mechanism for creating a first job and a second job which are respectively associated with a first application and a second application, the first job and the second job being arranged to concurrently run on the virtual machine;

a second mechanism, the second mechanism being arranged to provide the at least one job with at least one class that is arranged to be shared between the first job and the second job;

a third mechanism, the third mechanism being arranged to exchange information between the first job and the second job;

wherein the virtual machine includes a jobs manager, a class manager, and a heap manager;

wherein the jobs manager generates first and second jobs data, first and second garbage collection instance data, and virtual machine instance data respectively associated with said first and second jobs that concurrently run on the virtual machine, and the jobs manager further associates one or more methods to each of the jobs data, garbage collection instance data, and virtual machine instance data; and

wherein the class manager is arranged to create proxy data which enables a class associated with the virtual machine to be shared by the first and second jobs that are arranged to concurrently run on the virtual machine.

11. A virtual machine according to claim 10 wherein the first mechanism is further arranged to create a first heap associated with the first job and a second heap associated with the second job, and the third mechanism is further arranged to increase a size of the first heap and to decrease a size of the second heap.

12. A virtual machine according to claim 11 further including a first garbage collector and a second garbage collector, wherein the first garbage collector is arranged to perform a garbage collection on the first heap and the second garbage collector is arranged to perform a garbage collection on the second heap.

13. A virtual machine according to claim 11 wherein the size of the first heap and the size of the second heap may be dynamically altered.

14. A virtual machine according to claim 10 wherein at least one of the first job and the second job includes data which is persisted.

15. A computer-implemented method for executing a first application substantially concurrently with a second application on a virtual machine, the computer-implemented method comprising:

creating a first job on a virtual machine, the first job being associated with the first application;

creating a second job on the virtual machine, the second job being associated with the second application;

creating a first heap, the first heap being associated with the first job; and

creating a second heap, the second heap being associated with the second job

creating a jobs manager for concurrently supporting the first and second jobs on the virtual machine, wherein the jobs manager generates first and second jobs data, first and second garbage collection instance data, and virtual machine instance data respectively associated with said two or more jobs that concurrently run on the virtual machine, and the jobs manager further operating to associate one or more methods to each of the jobs data, garbage collection instance data, and virtual machine instance data; and

creating a class manager which is arranged to create proxy data which enables a class associated with the virtual machine to be shared by the two or more jobs that are arranged to concurrently run on the virtual machine.

16. A computer-implemented method as recited in claim 15, wherein the size of the first heap and the size of the second heap may be dynamically altered.

17. A computer-implemented method as recited in claim 15, wherein at least one of the first job and the second job includes data which is persisted.

18. A computer-implemented method as recited in claim 15, further comprising:

creating a first garbage collector and a second garbage collector, wherein the first garbage collector is arranged to perform a garbage collection on the first heap and the second garbage collector is arranged to perform a garbage collection on the second heap.

19. A computer readable medium including computer program code for executing a first application substantially concurrently with a second application on a virtual machine, the computer readable medium, comprising:

computer program code for creating a first job on a virtual machine, the first job being associated with the first application;

computer program code for creating a second job on the virtual machine, the second job being associated with the second application;

computer program code for creating a first heap, the first heap being associated with the first job; and

computer program code for creating a second heap, the second heap being associated with the second job

computer program code for creating a jobs manager for concurrently supporting the first and second jobs on the virtual machine, wherein the jobs manager generates first and second jobs data, first and second garbage collection instance data, and virtual machine instance data respectively associated with said two or more jobs that concurrently run on the virtual machine, and the jobs manager further operating to associate one or more methods to each of the jobs data, garbage collection instance data, and virtual machine instance data; and

computer program code for creating a class manager which is arranged to create proxy data which enables a class associated with the virtual machine to be shared by the two or more jobs that are arranged to concurrently run on the virtual machine.

20. A computer readable medium as recited in claim 19, wherein the size of the first heap and the size of the second heap may be dynamically altered.

21. A computer readable medium as recited in claim 19, wherein at least one of the first job and the second job includes data which is persisted.

22. A computer readable medium as recited in claim 19, further comprising:

computer program code for creating a first garbage collector and a second garbage collector, wherein the first garbage collector is arranged to perform a garbage collection on the first heap and the second garbage collector is arranged to perform a garbage collection on the second heap.