Optimizing just-in-time compiling for a java application executing on a compute node

• US 8,397,225 B2
• Filed: 04/24/2008
• Issued: 03/12/2013
• Est. Priority Date: 04/24/2008
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Barsness, Eric L., Darrington, David L., Peters, Amanda, Santosuosso, John M.
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): HEBERT, THEODORE E
• Application Number:
  US12/109,271
• Publication Number:
  US 20090271775A1
• Time in Patent Office: 1,783 Days
• Field of Search: 717/151
• US Class Current: 717/151
• CPC Class Codes: G06F 8/41 Compilation
• CPC Class Codes: G06F 9/45516 Runtime code conversion or optimisation

Abstract

Methods, systems, and products are disclosed for optimizing just-in-time (‘JIT’) compiling for a application executing on a compute node, the compute node having installed upon it a Virtual Machine (‘VM’) capable of supporting the application, that include: identifying, by an application manager, a particular portion of the application; assigning, by the application manager, a JIT level to the particular portion of the application; and jitting, by the VM installed on the compute node, the particular portion of the application in dependence upon the JIT level assigned to that particular portion of the ava application.

Claims

1. A method of optimizing just-in-time (‘

JIT’

) compiling for a software application executing on a compute node, the compute node having installed upon it a Virtual Machine (‘

VM’

) capable of supporting the software application, the method comprising;

identifying, by an application manager, a particular portion of the software application;

assigning, by the application manager, a JIT level to the particular portion of the software application, including;

establishing the JIT level for the particular portion of the software application in dependence upon a historic JIT profile for the particular portion of the software application and previous execution performance of the particular portion of the software application, wherein the previous execution performance for the particular portion includes a previous performance value and a number of times the particular portion was invoked, wherein the historic JIT profile specifies JIT levels previously used when jitting various portions of the software application;

determining whether the previous performance value for the particular portion is below a performance threshold and whether the number of times the particular portion was invoked exceeds a repetition threshold; and

incrementing the JIT level if the previous performance value is below the performance threshold and the number of times the portion was invoked exceeds a repetition threshold; and

jitting, by the VM installed on the compute node, the particular portion of the software application in dependence upon the JIT level assigned to that particular portion of the software application.

2. The method of claim 1 wherein the particular portion of the software application further comprises a generic type of software construct.

3. The method of claim 1 wherein the particular portion of the software application further comprises a specific implementation of a software construct.

4. The method of claim 1 wherein the particular portion of the software application further comprises a software call sequence for a particular software method.

5. The method of claim 1 wherein optimizing JIT compiling for a software application executing on a compute node further comprises optimizing JIT compiling for a software application executing on a parallel computer, the parallel computer comprising a plurality of compute nodes and a service node, the application manager installed upon the service node, the plurality of compute nodes connected for data communications through a plurality of data communications networks, at least one data communications network optimized for collective operations, and at least one other data communications network optimized for point to point operations.

6. A compute node capable of optimizing just-in-time (‘

JIT’

) compiling for a software application, the compute node having installed upon it a Virtual Machine (‘

VM’

) capable of supporting the software application, the compute node comprising a computer processor and computer memory operatively coupled to the computer processor, the computer memory for the compute node having disposed within it computer program instructions capable of;

identifying a particular portion of the software application;

assigning, by the application manager, a JIT level to the particular portion of the software application, including;

establishing the JIT level for the particular portion of the software application in dependence upon a historic JIT profile for the particular portion of the software application and previous execution performance of the particular portion of the software application, wherein the previous execution performance for the particular portion includes a previous performance value and a number of times the particular portion was invoked, wherein the historic JIT profile specifies JIT levels previously used when jitting various portions of the software application;

determining whether the previous performance value for the particular portion is below a performance threshold and whether the number of times the particular portion was invoked exceeds a repetition threshold; and

incrementing the JIT level if the previous performance value is below the performance threshold and the number of times the portion was invoked exceeds a repetition threshold; and

jitting, by the VM installed on the compute node, the particular portion of the software application in dependence upon the JIT level assigned to that particular portion of the software application.

7. The compute node of claim 6 wherein the particular portion of the software application further comprises a generic type of software construct.

8. The compute node of claim 6 wherein the particular portion of the software application further comprises a specific implementation of a software construct.

9. The compute node of claim 6 wherein the particular portion of the software application further comprises a software call sequence for a particular software method.

10. The compute node of claim 6 wherein optimizing JIT compiling for a software application executing on a compute node further comprises optimizing JIT compiling for a software application executing on a parallel computer, the parallel computer comprising a plurality of compute nodes and a service node, the application manager installed upon the service node, the plurality of compute nodes connected for data communications through a plurality of data communications networks, at least one data communications network optimized for collective operations, and at least one other data communications network optimized for point to point operations.

11. A computer program product for optimizing just-in-time (‘

JIT’

) compiling for a software application executing on a compute node, the compute node having installed upon it a Virtual Machine (‘

VM’

) capable of supporting the software application, the computer program product disposed upon a computer readable, recordable storage medium, wherein the recordable storage medium is not a signal, the computer program product comprising computer program instructions capable of;

identifying, by an application manager, a particular portion of the software application;

assigning, by the application manager, a JIT level to the particular portion of the software application, including;

establishing the JIT level for the particular portion of the software application in dependence upon a historic JIT profile for the particular portion of the software application and previous execution performance of the particular portion of the software application, wherein the previous execution performance for the particular portion includes a previous performance value and a number of times the particular portion was invoked, wherein the historic JIT profile specifies JIT levels previously used when jitting various portions of the software application;

determining whether the previous performance value for the particular portion is below a performance threshold and whether the number of times the particular portion was invoked exceeds a repetition threshold; and

incrementing the JIT level if the previous performance value is below the performance threshold and the number of times the portion was invoked exceeds a repetition threshold; and

jitting, by the VM installed on the compute node, the particular portion of the software application in dependence upon the JIT level assigned to that particular portion of the software application.

12. The computer program product of claim 11 wherein the particular portion of the software application further comprises a generic type of software construct.

13. The computer program product of claim 11 wherein the particular portion of the software application further comprises a specific implementation of a software construct.

14. The computer program product of claim 11 wherein the particular portion of the software application further comprises a software call sequence for a particular software method.

15. The computer program product of claim 11 wherein optimizing JIT compiling for a software application executing on a compute node further comprises optimizing JIT compiling for a software application executing on a parallel computer, the parallel computer comprising a plurality of compute nodes and a service node, the application manager installed upon the service node, the plurality of compute nodes connected for data communications through a plurality of data communications networks, at least one data communications network optimized for collective operations, and at least one other data communications network optimized for point to point operations.