JPH05189403A - Virtual time measuring method for simulation - Google Patents

Abstract

PURPOSE:To simply and flexibly measure the internal virtual time of simulation. CONSTITUTION:A processing routine 6 included in a simulation process 2 is started by an operating system 5 when the process 2 runs for a fixed time (with use of a CPU). Then the routine 6 advances the virtual time in the process 2. Thus it is not required to advance the time for each processing unit in the process 2. As a result, a program is simplified and at the same time the overhead is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing time in a time series simulation by a computer.

[0002]

2. Description of the Related Art FIG. 2 is a conceptual diagram of a time-series simulation process by a conventional computer. In the figure, 1 is a computer, 2 is a simulation process, 3a and 3b are other processes, and 4 is a simulation process inside. The execution step number counter is shown.

Next, the operation will be described. As one process in the computer 1, a time-series simulation process 2 and other processes 3a and 3b operate as a multi-process. At this time, the time-series simulation process 2 has the execution step number counter 4 in order to know how much virtual time has advanced to update the internal time and time information. This counter is incremented each time one unit of simulation is completed, and when a certain number is exceeded, it means that the virtual time has advanced.

[0004]

In the conventional simulation, the simulation is executed as a process. Therefore, in order to introduce the concept of time, the simulation process has a counter of the number of execution steps and the like. It was necessary to update the time, and there was the overhead of counting up the execution steps and checking the value, and the complexity of the program.

The present invention has been made to solve the above problems, and an object thereof is to eliminate the execution step number counter for introducing the concept of time, and to eliminate the processing overhead due to it.

[0006]

A time measuring method in a simulation according to the present invention measures a virtual time of a simulation by an execution time measuring function provided by an operating system.

[0007]

The virtual time measurement according to the present invention is started by the process execution measuring mechanism provided by the operating system and is not measured by the process itself.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a computer, 2 is a simulation process, 3a and 3b are other processes, and 5 is
The operating system 6 is a processing routine in the simulation process activated by the operating system 5.

The simulation process 2 makes use of the process execution time monitoring function of the operating system 5 at the start of operation, and sets the processing routine 6 in its own process to be activated when it has run for a certain time. After that, the simulation is executed.
The processing routine 6 is started every time the PU time is consumed. In the processing routine 6, processing for advancing the virtual time in the simulation process is performed.

In the above embodiment, the virtual time processing method has been described for the time-series simulation, but it can also be used as a mechanism for stopping the runaway of the simulation in the non-time-series simulation.

[0011]

As described above, according to the present invention, since the method for measuring the time in the simulation is configured by using the execution time monitoring function of the process by the operating system, the overhead of the process itself is reduced,
Moreover, there is an effect that the program itself can be simplified.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a simulation process according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a conventional simulation process.

[Explanation of symbols]

 1 Computer 2 Simulation Process 5 Operating System 6 Time Processing Routine

Claims (1)

[Claims] 1. A method for measuring virtual time in a simulation, wherein the virtual time in the simulation is measured by using a process execution time monitoring function provided by an operating system.