Static-Priority Scheduling on Multiprocessors

• This chapter deals with the problem of scheduling a set oftasks to meet deadlines on a computer with multiple processors. Static-priority scheduling is considered,that is, a task is assigned a priority number that never changes and at every moment the highest-priority tasks that request to be executed are selected for execution.The performance metric used is the capacity that taskscan request without missing a deadline. It is shown that every static-priority algorithm can miss deadlines although close to 50% of the capacity is requested.The new algorithms in this chapter have the following performance. In periodic scheduling, the capacity that can be requested without missing a deadline is: 33% for migrative scheduling and 50% for non-migrative scheduling.In aperiodic scheduling, many performance metrics have been used in previous research. With the aperiodic model used in this chapter, the new algorithms in this chapter have the following performance. The capacity that can be requested without missing a deadline is: 50% for migrative scheduling and 31% for non-migrative scheduling.

Subject headings

NATURVETENSKAP  -- Data- och informationsvetenskap -- Datorteknik (hsv//swe)

NATURAL SCIENCES  -- Computer and Information Sciences -- Computer Engineering (hsv//eng)

NATURVETENSKAP  -- Data- och informationsvetenskap -- Datavetenskap (hsv//swe)

NATURAL SCIENCES  -- Computer and Information Sciences -- Computer Sciences (hsv//eng)

Keyword

online scheduling

global scheduling

aperiodic

multiprocessors

real-time systems

multiprocessor scheduling

real-time scheduling

static-priority scheduling

partitioned scheduling

periodic

Publication and Content Type

kap (subject category)

vet (subject category)