Application server system and computer product

• US 20070226715A1
• Filed: 06/28/2006
• Published: 09/27/2007
• Est. Priority Date: 02/13/2006
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Hayashi, Masakazu, Hattori, Hidetoshi, Kimura, Yukihiro, Hashiguchi, Masafumi
• Granted Patent: US 8,332,845 B2
• Time in Patent Office: Days
• US Class Current: 717/148
• CPC Class Codes: G06F 9/45516 Runtime code conversion or optimisation

Abstract

A recovery virtual machine acquires execution frequency information from a file, and converts a procedure, of which execution frequency is high in the execution frequency information acquired, to native code, and the time for starting the conversion is thereby reduced. Furthermore, by performing conversion at a timing at which a target procedure is invoked, load occurring due to the conversion is distributed, to prevent occurrence of failure in execution of an application caused by the load occurring due to the conversion.

Claims

1. An application server system for causing a computer to execute a virtual machine program for executing an application that consists of intermediate code, and to execute an application server program for controlling start of the virtual machine program, wherein

the application server program includes

a virtual machine controller that specifies a condition such that execution frequency information obtained by counting execution frequency of a procedure in the application should be acquired from an external unit, and also specifies another condition such that a procedure of which execution frequency is higher than a predetermined value should be compiled from intermediate code to native code based on the execution frequency information, and that starts the virtual machine program, and

the virtual machine program includes

an execution frequency information input unit that acquires the execution frequency information from an external unit according to the specification of the application server program;

a compile target selector that selects a procedure of which execution frequency is higher than a predetermined value, from the execution frequency information acquired;

a compile unit that compiles the procedure selected to the native code; and

an execution controller that executes the native code instead of the intermediate code when a procedure, in which the native code compiled is present, is invoked in the application during execution.

2. The application server system according to claim 1, wherein after all procedures selected are compiled into native code by the compile unit, the compile target selector informs the application server program that all the procedures are compiled.

3. The application server system according to claim 1, wherein when a procedure is invoked during execution of the application, the compile unit refers to the execution frequency information instead of compilation of the procedure selected by the compile target selector into native code, to acquire execution frequency of the procedure, and compiles the procedure from the intermediate code into the native code if the execution frequency acquired is higher than the predetermined value.

4. The application server system according to claim 1, wherein when load of a central processing unit (CPU) is higher than a predetermined value, the compile unit does not compile the procedure into the native code.

5. A computer-readable recording medium that stores therein a virtual machine program that causes a computer to function as:

a counter that counts a frequency of invoking a procedure in application during execution of the application consisting of intermediate code, and stores the frequency as execution frequency information in a storage unit;

a compile unit that converts a procedure, of which execution frequency is high in the execution frequency information, from the intermediate code to the native code;

an execution controller that executes the native code instead of the intermediate code when a procedure, in which the native code compiled is present,,is invoked in the application during execution; and

an execution frequency information input unit that acquires the execution frequency information from an external unit.

6. The computer-readable recording medium according to claim 5, wherein the virtual machine program further causes the computer to function as:

a compile target selector-that selects a procedure of which execution frequency is higher than a predetermined value, from the execution frequency information acquired, and causes the compile unit to execute the process for converting the procedure selected to the native code.

7. The computer-readable recording medium according to claim 5, wherein when a procedure is invoked during execution of the application, the compile unit refers to the execution frequency information to acquire execution frequency of the procedure, and compiles the procedure from the intermediate code into the native code if the execution frequency acquired is higher than the predetermined value.

8. The computer-readable recording medium according to claim 5, wherein when load of a central processing unit (CPU) is higher than a predetermined value, the compile unit does not compile the procedure into the native code.

9. The computer-readable recording medium according to claim 5, wherein

the counter stores a file size of a module including a procedure in the execution frequency information, and when a module including a procedure is loaded,

the execution controller checks a file size of the module loaded against the file size of the module stored in the execution frequency information, and deletes information for the module from the execution frequency information when values of the two do not match each other.

10. The computer-readable recording medium according to claim 5, wherein

the counter stores a code value for checking identity of a module including a procedure, in the execution frequency information, and when a module including a procedure is loaded,

the execution controller checks a code value of the module loaded against the code value of the module stored in the execution frequency information, and deletes information for the module from the execution frequency information when the code values of the two do not match each other.