The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 1999
Filed:
Jul. 05, 1996
Vernon K Boland, Lexington, SC (US);
Kevin R Brasche, Irmo, SC (US);
Kenneth A Smith, Prosperity, SC (US);
NCR Corporation, Dayton, OH (US);
Abstract
An improved affinity process scheduling method for a multiprocessor computer system, wherein a process previously executed on a processor within the computer system is affined to the processor on which it previously executed, and will be scheduled for execution by the affined processor during subsequent requests for execution of the affined process. The improved affinity process scheduling method monitors the length of time the affined process resides on the system run queue awaiting execution by its affined processor; and schedules the affined process for execution with another available processor when the length of time the affined process has been waiting for execution exceeds a predetermined 'steal-age' threshold. The improved affinity process scheduling method also monitors the processing load borne by the affined processor, determines therefrom a headroom parameter for the affined processor, the headroom parameter indicating the remaining load capacity of the affined processor; and schedules the affined process for execution with another available processor when the headroom of the affined processor is less than a predetermined 'low-headroom' threshold.