Information processing system of task scheduling, method of task scheduling, and non-transitory computer-readable storage medium for storing program of task scheduling

A method implemented by a computer, the method comprising:

• obtaining, by processor circuitry of the computer, schedule information stored in a memory of the computer, the schedule information including a first clock time scheduled for execution of a task;
• in a case where a system load of the information processing system is smaller than a threshold, selecting the task as a target for a speculation execution;
• in response to the selecting of the task as the target for the speculation execution, executing, by the processor circuitry of the computer, the task by using data corresponding to the task, at a second clock time that is earlier than the first clock time indicated in the schedule information;
• in a case where the data used in the task is not updated in a period from the second clock time to the first clock time, controlling, by the processor circuitry of the computer, the executing of the task not to execute the task at the first clock time;
• and
• in response to detecting that the data used in the task is updated in the period from the second clock time to the first clock time, controlling, by the processor circuitry of the computer, the executing of the task to re-execute the task.

A non-transitory computer-readable storage medium for storing a program which causes a computer to perform processing, the processing comprising:

• obtaining, by processor circuitry of the computer, schedule information stored in a memory of the computer, the schedule information including a first clock time scheduled for execution of a task;
• in a case where a system load of the information processing system is smaller than a threshold, selecting the task as a target for a speculation execution;
• in response to the selecting of the task as the target for the speculation execution, executing, by the processor circuitry of the computer, the task by using data corresponding to the task, at a second clock time that is earlier than the first clock time indicated in the schedule information;
• in a case where the data used in the task is not updated in a period from the second clock time to the first clock time, controlling, by the processor circuitry of the computer, the executing of the task not to execute the task at the first clock time;
• and
• in response to detecting that the data used in the task is updated in the period from the second clock time to the first clock time, controlling, by the processor circuitry of the computer, the executing of the task to re-execute the task.