Fujitsu Corporation

Yukihiro Kimura

Masakazu Hayashi

Yuji Watanabe

Masafumi Hashiguchi

Katsutomo Sekiguchi

Kaname Mita

Hidetoshi Hattori

In dynamic compilation, timing of compiling is set for each method in accordance with information such as an execution frequency for each method so that methods having a large influence on the execution performance of the entire application program are compiled earlier. Thereby, the balance of execution is optimized between execution by an interpreter and execution based on native codes, and the execution performance immediately after the activation of an application program becomes stable.

Application server for optimizing timing of performing dynamic compilation

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.

Compile timing based on execution frequency of a procedure

Measurement/analysis unit in a Java virtual machine has the function of measuring data when an event of garbage collection occurs, and the function of periodically measuring data. The measurement/analysis unit analyzes the measured data and predicts a danger of a memory shortage, and predicts a danger using an algorithm depending on the type of garbage collection used by the Java virtual machine. An application server is notified of a warning of the predicted danger of a memory shortage by an analysis result notification means by an inter-process communication, or the like. The measurement/analysis unit calculates a memory capacity required to avoid the predicted danger of a memory shortage, and the calculated memory capacity is transmitted to the application server by the analysis result notification means by an inter-process communication, or the like in the same way as the warning.

Method for predicting and avoiding danger in execution environment

A compile processing apparatus compiles a program formed of a plurality of classes having initializing procedures. The compile processing apparatus includes a specifying unit for specifying an initializing procedure when a statement to be compiled requires the initializing procedure, a determination unit for executing a determination process for determining whether the initializing procedure specified by the specifying unit can be considered to not affect other classes, and a changing unit for changing the statement so that the statement does not access the initializing procedure when the determination unit determines that the initializing procedure can be considered to not affect the other classes.

Compile processing apparatus and method and program executing apparatus and method

A device which outputs initial values of a data statement corresponding to a source program that has been converted into an intermediate program. The intermediate program contains initial value data corresponding to the initial values of the data statement. A taking-out mechanism takes out the initial value data from the intermediate program. An initial value storing mechanism prepares an initial value storage table and sets the initial value data taken out by the taking-out mechanism in the initial value storage table. An object program output mechanism generates an object program based on the initial value data set in the initial value storage table. The initial value storing mechanism sets an iteration count of the initial values in the initial value storage table, and increases the iteration count in correspondence with the respective initial values so that the initial values can be stored in the initial value storage table.

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Kawasaki, Japan

Yukihiro Kimura