Method of controlling print job schedule and printing system using the method

A computer-readable storage having embodied thereon a computer program for controlling a print job schedule in a printing system having a first memory unit storing a printer operating system and a least two interpreters, and a second memory unit having an operating area for the printer operating system, an operating area and a heap area for each interpreter of the first memory unit, and at least two reception buffers for temporarily storing incoming print job data, the computer program in the computer-readable storage comprising a process of:

• initiating interpretation of succeeding print job data earlier, even when preceding print job data are being interpreted, when the succeeding print job data have higher priority;
• initiating interpretation of the succeeding print job data earlier, when an interpreter run time of the preceding print job data exceeds a predetermined amount of time, even though the succeeding print job data does not have priority;
• alternately interpreting multiple print job data by time-sharing when the multiple print job data have equal occupation ratios without priorities, or interpreting the multiple print job data by time-sharing according to occupation ratios when the multiple print job data have different occupation ratios without priorities;
• and
• stopping the interpretation of lower priority print job data to allow higher priority print job data to be completely interpreted earlier, when the multiple print job data being interpreted have priorities, regardless of the occupation ratios of the multiple print job data.

A method of controlling a print job schedule for multiple print jobs that are requested in sequential order, the method comprising:

• scheduling initiation of interpreters according to a first scheduling procedure depending on print job priority between preceding print job data having interpretation initiated and succeeding print job data;
• scheduling a process of interpretation of multiple print job data having interpretation initiated according to a second scheduling procedure depending on interpreter run time and print job priority;
• and
• changing the print job schedule according to the first scheduling procedure and the second scheduling procedure.