Method of reducing power consumption of system software using query scheduling of application and apparatus for reducing power consumption using the method

A method of reducing power consumption using query scheduling of an application program, the method comprising:

• checking whether a new query or new input data exists in an input unit of a data base system or a data stream processing system;
• in response to a new query or new input data existing, calculating a required minimum number of cycles per unit time which corresponds to the minimum number of cycles per unit time that is required to process the new query or the new input data;
• selecting, in response to a plurality of queries to be processed existing, a query to execute first;
• calculating the number of cycles to be processed during the time period set in advance by multiplying the calculated, required minimum number of cycles per unit time with a time period that is allocated to process the selected query or the input data and is set in advance;
• measuring an actual time taken to execute the calculated number of cycles;
• and
• in response to the measured time being less than the time period set in advance and a the difference between the measured time and the time period set in advance is equal to or longer than a predetermined value, putting a processor of a system into a dormant state during time corresponding to the difference.

A method of reducing power consumption using query scheduling of an application program, the method comprising:

• checking whether a new query or new input data exists in an input unit of a data base system or a data stream processing system;
• in response to a new query or new input data existing, calculating a required minimum number of cycles per unit time which corresponds with the minimum number of cycles per unit time that is required to process the new query or the new input data;
• selecting, in response to a plurality of queries to be processed existing, a query to execute first;
• setting a deadline by which the query or input data is to be processed by calculating a predicted time period for executing the selected query and by using the calculated, required minimum number of cycles per unit time and the predicted time period for executing the selected query;
• setting an optimum central processing unit (CPU) input voltage by transmitting the deadline and the cycles predicted to be executed;
• and
• calculating and executing the number of cycles to be processed by the deadline by multiplying the calculated, required minimum number of cycles per unit time with the deadline.

A mobile terminal including a data base system or a data stream processing system on an operating system, the terminal comprising:

• a required minimum cycle calculation unit configured to, in response to a new query or new input data being input, calculate the required minimum number of cycles per unit time which corresponds to the minimum number of cycles required to process the new query or the new input data per unit time;
• a query selection unit configured to select a query to execute first, in response to a plurality of queries to be processed existing;
• a query/input data processing unit configured to calculate and execute the number of cycles to be processed during the time period set in advance by multiplying the required minimum number of cycles per unit time with a time period that is allocated to process the selected query or input data;
• and
• a system control unit configured to control a system to be in a dormant state for the remaining time period in response to the execution of the calculated number of cycles being completed within the time period set in advance.

A mobile terminal including a data base system or a data stream processing system on an operating system, the terminal comprising:

• a required minimum cycle calculation unit configured to, in response to a new query or new input data being input, calculate the required minimum number of cycles per unit time which corresponds with the minimum number of cycles required to process the new query or the new input data per unit time;
• a query selection unit configured to select a query to execute first, in response to a plurality of queries to be processed existing;
• a deadline setting unit configured to calculate a predicted time period for executing the query, and setting a deadline by which the query or input data is to be processed by using the calculated, required minimum number of cycles per unit time and the predicted time period for executing the selected query;
• a CPU input voltage setting unit configured to transmit the deadline by which the query or input data is to be processed and cycles predicted to be executed, to an operating system to set up an optimum CPU input voltage;
• and
• a query/input data processing unit configured to calculate and perform the number of cycles to be processed before the deadline by multiplying the calculated required minimum number of cycles per unit time with the deadline.